diff --git a/.eslintrc.js b/.eslintrc.js
index 4fcc035..b977257 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -28,5 +28,6 @@ module.exports = {
       named: 'always',
       asyncArrow: 'always',
     }],
+    'indent': ['error', 2]
   }
 }
diff --git a/.travis.yml b/.travis.yml
index 3e9f562..518c575 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ install:
 script:
   - npm run lint:wrapper
   - npm run lint:contract-tests
-  # - yarn lint:contracts
+  - npm test
 
 branches:
   only:
diff --git a/apps/contribution/package-lock.json b/apps/contribution/package-lock.json
index b4da1da..fe9d729 100644
--- a/apps/contribution/package-lock.json
+++ b/apps/contribution/package-lock.json
@@ -7751,6 +7751,7 @@
             "minipass": {
               "version": "2.3.5",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.2",
                 "yallist": "^3.0.0"
@@ -7767,6 +7768,7 @@
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -7850,6 +7852,7 @@
             "once": {
               "version": "1.4.0",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -8099,7 +8102,6 @@
               "version": "1.3.5",
               "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
               "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
-              "optional": true,
               "requires": {
                 "mime-types": "~2.1.18",
                 "negotiator": "0.6.1"
@@ -8135,14 +8137,12 @@
             "any-promise": {
               "version": "1.3.0",
               "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
-              "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8=",
-              "optional": true
+              "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
             },
             "array-flatten": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-              "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
-              "optional": true
+              "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
             },
             "asn1": {
               "version": "0.2.4",
@@ -8156,7 +8156,6 @@
               "version": "4.10.1",
               "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
               "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
-              "optional": true,
               "requires": {
                 "bn.js": "^4.0.0",
                 "inherits": "^2.0.1",
@@ -8850,8 +8849,7 @@
             "base64-js": {
               "version": "1.3.0",
               "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
-              "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw==",
-              "optional": true
+              "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw=="
             },
             "bcrypt-pbkdf": {
               "version": "1.0.2",
@@ -8893,7 +8891,6 @@
               "version": "1.2.2",
               "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
               "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
-              "optional": true,
               "requires": {
                 "readable-stream": "^2.3.5",
                 "safe-buffer": "^5.1.1"
@@ -8923,7 +8920,6 @@
               "version": "1.18.3",
               "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
               "integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
-              "optional": true,
               "requires": {
                 "bytes": "3.0.0",
                 "content-type": "~1.0.4",
@@ -8941,7 +8937,6 @@
                   "version": "2.6.9",
                   "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
                   "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-                  "optional": true,
                   "requires": {
                     "ms": "2.0.0"
                   }
@@ -9002,7 +8997,6 @@
               "version": "4.0.1",
               "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
               "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
-              "optional": true,
               "requires": {
                 "bn.js": "^4.1.0",
                 "randombytes": "^2.0.1"
@@ -9065,7 +9059,6 @@
               "version": "5.2.1",
               "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.2.1.tgz",
               "integrity": "sha512-c+Ko0loDaFfuPWiL02ls9Xd3GO3cPVmUobQ6t3rXNUk304u6hGq+8N/kFi+QEIKhzK3uwolVhLzszmfLmMLnqg==",
-              "optional": true,
               "requires": {
                 "base64-js": "^1.0.2",
                 "ieee754": "^1.1.4"
@@ -9075,7 +9068,6 @@
               "version": "1.2.0",
               "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
               "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
-              "optional": true,
               "requires": {
                 "buffer-alloc-unsafe": "^1.1.0",
                 "buffer-fill": "^1.0.0"
@@ -9084,8 +9076,7 @@
             "buffer-alloc-unsafe": {
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
-              "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==",
-              "optional": true
+              "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg=="
             },
             "buffer-crc32": {
               "version": "0.2.13",
@@ -9096,8 +9087,7 @@
             "buffer-fill": {
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
-              "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
-              "optional": true
+              "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw="
             },
             "buffer-from": {
               "version": "1.1.1",
@@ -9107,8 +9097,7 @@
             "buffer-to-arraybuffer": {
               "version": "0.0.5",
               "resolved": "https://registry.npmjs.org/buffer-to-arraybuffer/-/buffer-to-arraybuffer-0.0.5.tgz",
-              "integrity": "sha1-YGSkD6dutDxyOrqe+PbhIW0QURo=",
-              "optional": true
+              "integrity": "sha1-YGSkD6dutDxyOrqe+PbhIW0QURo="
             },
             "buffer-xor": {
               "version": "1.0.3",
@@ -9118,8 +9107,7 @@
             "bytes": {
               "version": "3.0.0",
               "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
-              "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg=",
-              "optional": true
+              "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
             },
             "bytewise": {
               "version": "1.1.0",
@@ -9251,7 +9239,6 @@
               "version": "2.8.1",
               "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
               "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
-              "optional": true,
               "requires": {
                 "graceful-readlink": ">= 1.0.0"
               }
@@ -9275,14 +9262,12 @@
             "content-disposition": {
               "version": "0.5.2",
               "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
-              "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
-              "optional": true
+              "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ="
             },
             "content-type": {
               "version": "1.0.4",
               "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
-              "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==",
-              "optional": true
+              "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
             },
             "convert-source-map": {
               "version": "1.6.0",
@@ -9295,20 +9280,17 @@
             "cookie": {
               "version": "0.3.1",
               "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-              "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=",
-              "optional": true
+              "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
             },
             "cookie-signature": {
               "version": "1.0.6",
               "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
-              "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw=",
-              "optional": true
+              "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
             },
             "cookiejar": {
               "version": "2.1.2",
               "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.2.tgz",
-              "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA==",
-              "optional": true
+              "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA=="
             },
             "core-js": {
               "version": "2.6.5",
@@ -9324,7 +9306,6 @@
               "version": "2.8.5",
               "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
               "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
-              "optional": true,
               "requires": {
                 "object-assign": "^4",
                 "vary": "^1"
@@ -9417,8 +9398,7 @@
             "decode-uri-component": {
               "version": "0.2.0",
               "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
-              "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
-              "optional": true
+              "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU="
             },
             "decompress": {
               "version": "4.2.0",
@@ -9448,7 +9428,6 @@
               "version": "3.3.0",
               "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-3.3.0.tgz",
               "integrity": "sha1-gKTdMjdIOEv6JICDYirt7Jgq3/M=",
-              "optional": true,
               "requires": {
                 "mimic-response": "^1.0.0"
               }
@@ -9457,7 +9436,6 @@
               "version": "4.1.1",
               "resolved": "https://registry.npmjs.org/decompress-tar/-/decompress-tar-4.1.1.tgz",
               "integrity": "sha512-JdJMaCrGpB5fESVyxwpCx4Jdj2AagLmv3y58Qy4GE6HMVjWz1FeVQk1Ct4Kye7PftcdOo/7U7UKzYBJgqnGeUQ==",
-              "optional": true,
               "requires": {
                 "file-type": "^5.2.0",
                 "is-stream": "^1.1.0",
@@ -9583,8 +9561,7 @@
             "depd": {
               "version": "1.1.2",
               "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
-              "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
-              "optional": true
+              "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
             },
             "des.js": {
               "version": "1.0.0",
@@ -9599,8 +9576,7 @@
             "destroy": {
               "version": "1.0.4",
               "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
-              "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
-              "optional": true
+              "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
             },
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@@ -9639,8 +9615,7 @@
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               "resolved": "https://registry.npmjs.org/duplexer3/-/duplexer3-0.1.4.tgz",
-              "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
-              "optional": true
+              "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI="
             },
             "ecc-jsbn": {
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@@ -9654,8 +9629,7 @@
             "ee-first": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
-              "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=",
-              "optional": true
+              "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
             },
             "electron-to-chromium": {
               "version": "1.3.113",
@@ -9679,8 +9653,7 @@
             "encodeurl": {
               "version": "1.0.2",
               "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
-              "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=",
-              "optional": true
+              "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
             },
             "encoding": {
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@@ -9769,8 +9742,7 @@
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               "version": "1.0.3",
               "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
-              "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg=",
-              "optional": true
+              "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
             },
             "escape-string-regexp": {
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@@ -9785,8 +9757,7 @@
             "etag": {
               "version": "1.8.1",
               "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
-              "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
-              "optional": true
+              "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
             },
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@@ -9864,7 +9835,6 @@
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               "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.1.27.tgz",
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-              "optional": true,
               "requires": {
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@@ -10279,7 +10249,6 @@
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               "resolved": "https://registry.npmjs.org/ethjs-unit/-/ethjs-unit-0.1.6.tgz",
               "integrity": "sha1-xmWSHkduh7ziqdWIpv4EBbLEFpk=",
-              "optional": true,
               "requires": {
                 "bn.js": "4.11.6",
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@@ -10288,8 +10257,7 @@
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                   "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
-                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU=",
-                  "optional": true
+                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
                 }
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@@ -10305,8 +10273,7 @@
             "eventemitter3": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-1.1.1.tgz",
-              "integrity": "sha1-R3hr2qCHyvext15zq8XH1UAVjNA=",
-              "optional": true
+              "integrity": "sha1-R3hr2qCHyvext15zq8XH1UAVjNA="
             },
             "events": {
               "version": "3.0.0",
@@ -10326,7 +10293,6 @@
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-              "optional": true,
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@@ -10364,7 +10330,6 @@
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-                  "optional": true,
                   "requires": {
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@@ -10372,8 +10337,7 @@
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                   "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
-                  "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==",
-                  "optional": true
+                  "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew=="
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@@ -10436,8 +10400,7 @@
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-              "integrity": "sha1-LdvqfHP/42No365J3DOMBYwritY=",
-              "optional": true
+              "integrity": "sha1-LdvqfHP/42No365J3DOMBYwritY="
             },
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@@ -10448,7 +10411,6 @@
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-              "optional": true,
               "requires": {
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@@ -10463,7 +10425,6 @@
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-                  "optional": true,
                   "requires": {
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@@ -10471,8 +10432,7 @@
                 "statuses": {
                   "version": "1.4.0",
                   "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
-                  "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==",
-                  "optional": true
+                  "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew=="
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@@ -10511,26 +10471,22 @@
             "forwarded": {
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               "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
-              "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ=",
-              "optional": true
+              "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
             },
             "fresh": {
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-              "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==",
-              "optional": true
+              "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ=="
             },
             "sha.js": {
               "version": "2.4.11",
@@ -12847,14 +12759,12 @@
             "simple-concat": {
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.0.tgz",
-              "integrity": "sha1-c0TLuLbib7J9ZrL8hvn21Zl1IcY=",
-              "optional": true
+              "integrity": "sha1-c0TLuLbib7J9ZrL8hvn21Zl1IcY="
             },
             "simple-get": {
               "version": "2.8.1",
               "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-2.8.1.tgz",
               "integrity": "sha512-lSSHRSw3mQNUGPAYRqo7xy9dhKmxFXIjLjp4KHpf99GEH2VH7C3AM+Qfx6du6jhfUi6Vm7XnbEVEf7Wb6N8jRw==",
-              "optional": true,
               "requires": {
                 "decompress-response": "^3.3.0",
                 "once": "^1.3.1",
@@ -12927,8 +12837,7 @@
             "statuses": {
               "version": "1.5.0",
               "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
-              "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
-              "optional": true
+              "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
             },
             "stream-to-pull-stream": {
               "version": "1.7.2",
@@ -12949,8 +12858,7 @@
             "strict-uri-encode": {
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
-              "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=",
-              "optional": true
+              "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM="
             },
             "string-width": {
               "version": "1.0.2",
@@ -13078,7 +12986,6 @@
               "version": "1.6.2",
               "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
               "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
-              "optional": true,
               "requires": {
                 "bl": "^1.0.0",
                 "buffer-alloc": "^1.2.0",
@@ -13114,7 +13021,6 @@
               "version": "3.3.0",
               "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.0.tgz",
               "integrity": "sha1-5p44obq+lpsBCCB5eLn2K4hgSDk=",
-              "optional": true,
               "requires": {
                 "any-promise": "^1.0.0"
               }
@@ -13123,7 +13029,6 @@
               "version": "1.6.0",
               "resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
               "integrity": "sha1-GhkY1ALY/D+Y+/I02wvMjMEOlyY=",
-              "optional": true,
               "requires": {
                 "thenify": ">= 3.1.0 < 4"
               }
@@ -13145,8 +13050,7 @@
             "timed-out": {
               "version": "4.0.1",
               "resolved": "https://registry.npmjs.org/timed-out/-/timed-out-4.0.1.tgz",
-              "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
-              "optional": true
+              "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8="
             },
             "tmp": {
               "version": "0.0.33",
@@ -13159,8 +13063,7 @@
             "to-buffer": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
-              "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg==",
-              "optional": true
+              "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg=="
             },
             "to-fast-properties": {
               "version": "1.0.3",
@@ -13210,7 +13113,6 @@
               "version": "1.6.16",
               "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
               "integrity": "sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==",
-              "optional": true,
               "requires": {
                 "media-typer": "0.3.0",
                 "mime-types": "~2.1.18"
@@ -13250,8 +13152,7 @@
             "ultron": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
-              "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
-              "optional": true
+              "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og=="
             },
             "unbzip2-stream": {
               "version": "1.3.3",
@@ -13266,8 +13167,7 @@
             "underscore": {
               "version": "1.8.3",
               "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
-              "integrity": "sha1-Tz+1OxBuYJf8+ctBCfKl6b36UCI=",
-              "optional": true
+              "integrity": "sha1-Tz+1OxBuYJf8+ctBCfKl6b36UCI="
             },
             "unorm": {
               "version": "1.5.0",
@@ -13277,8 +13177,7 @@
             "unpipe": {
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
-              "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
-              "optional": true
+              "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
             },
             "uri-js": {
               "version": "4.2.2",
@@ -13292,7 +13191,6 @@
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
               "integrity": "sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=",
-              "optional": true,
               "requires": {
                 "prepend-http": "^1.0.1"
               }
@@ -13300,14 +13198,12 @@
             "url-set-query": {
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/url-set-query/-/url-set-query-1.0.0.tgz",
-              "integrity": "sha1-AW6M/Xwg7gXK/neV6JK9BwL6ozk=",
-              "optional": true
+              "integrity": "sha1-AW6M/Xwg7gXK/neV6JK9BwL6ozk="
             },
             "url-to-options": {
               "version": "1.0.1",
               "resolved": "https://registry.npmjs.org/url-to-options/-/url-to-options-1.0.1.tgz",
-              "integrity": "sha1-FQWgOiiaSMvXpDTvuu7FBV9WM6k=",
-              "optional": true
+              "integrity": "sha1-FQWgOiiaSMvXpDTvuu7FBV9WM6k="
             },
             "utf8": {
               "version": "3.0.0",
@@ -13323,8 +13219,7 @@
             "utils-merge": {
               "version": "1.0.1",
               "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-              "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
-              "optional": true
+              "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
             },
             "uuid": {
               "version": "3.3.2",
@@ -13343,8 +13238,7 @@
             "vary": {
               "version": "1.1.2",
               "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-              "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
-              "optional": true
+              "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
             },
             "verror": {
               "version": "1.10.0",
@@ -13386,7 +13280,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-core/-/web3-core-1.0.0-beta.35.tgz",
               "integrity": "sha512-ayGavbgVk4KL9Y88Uv411fBJ0SVgVfKhKEBweKYzmP0zOqneMzWt6YsyD1n6kRvjAbqA0AfUPEOKyMNjcx2tjw==",
-              "optional": true,
               "requires": {
                 "web3-core-helpers": "1.0.0-beta.35",
                 "web3-core-method": "1.0.0-beta.35",
@@ -13398,7 +13291,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-core-helpers/-/web3-core-helpers-1.0.0-beta.35.tgz",
               "integrity": "sha512-APOu3sEsamyqWt//8o4yq9KF25/uqGm+pQShson/sC4gKzmfJB07fLo2ond0X30E8fIqAPeVCotPXQxGciGUmA==",
-              "optional": true,
               "requires": {
                 "underscore": "1.8.3",
                 "web3-eth-iban": "1.0.0-beta.35",
@@ -13409,7 +13301,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-core-method/-/web3-core-method-1.0.0-beta.35.tgz",
               "integrity": "sha512-jidImCide8q0GpfsO4L73qoHrbkeWgwU3uOH5DKtJtv0ccmG086knNMRgryb/o9ZgetDWLmDEsJnHjBSoIwcbA==",
-              "optional": true,
               "requires": {
                 "underscore": "1.8.3",
                 "web3-core-helpers": "1.0.0-beta.35",
@@ -13422,7 +13313,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-core-promievent/-/web3-core-promievent-1.0.0-beta.35.tgz",
               "integrity": "sha512-GvqXqKq07OmHuVi5uNRg6k79a1/CI0ViCC+EtNv4CORHtDRmYEt5Bvdv6z6FJEiaaQkD0lKbFwNhLxutx7HItw==",
-              "optional": true,
               "requires": {
                 "any-promise": "1.3.0",
                 "eventemitter3": "1.1.1"
@@ -13432,7 +13322,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-core-requestmanager/-/web3-core-requestmanager-1.0.0-beta.35.tgz",
               "integrity": "sha512-S+zW2h17ZZQU9oe3yaCJE0E7aJS4C3Kf4kGPDv+nXjW0gKhQQhgVhw1Doq/aYQGqNSWJp7f1VHkz5gQWwg6RRg==",
-              "optional": true,
               "requires": {
                 "underscore": "1.8.3",
                 "web3-core-helpers": "1.0.0-beta.35",
@@ -13445,7 +13334,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-core-subscriptions/-/web3-core-subscriptions-1.0.0-beta.35.tgz",
               "integrity": "sha512-gXzLrWvcGkGiWq1y33Z4Y80XI8XMrwowiQJkrPSjQ81K5PBKquOGwcMffLaKcwdmEy/NpsOXDeFo3eLE1Ghvvw==",
-              "optional": true,
               "requires": {
                 "eventemitter3": "1.1.1",
                 "underscore": "1.8.3",
@@ -13476,7 +13364,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-eth-abi/-/web3-eth-abi-1.0.0-beta.35.tgz",
               "integrity": "sha512-KUDC+EtFFYG8z01ZleKrASdjj327/rtWHzEt6RWsEj7bBa0bGp9nEh+nqdZx/Sdgz1O8tnfFzJlrRcXpfr1vGg==",
-              "optional": true,
               "requires": {
                 "bn.js": "4.11.6",
                 "underscore": "1.8.3",
@@ -13487,8 +13374,7 @@
                 "bn.js": {
                   "version": "4.11.6",
                   "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
-                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU=",
-                  "optional": true
+                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
                 }
               }
             },
@@ -13559,7 +13445,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-eth-iban/-/web3-eth-iban-1.0.0-beta.35.tgz",
               "integrity": "sha512-H5wkcNcAIc+h/WoDIKv7ZYmrM2Xqu3O7jBQl1IWo73EDVQji+AoB2i3J8tuwI1yZRInRwrfpI3Zuwuf54hXHmQ==",
-              "optional": true,
               "requires": {
                 "bn.js": "4.11.6",
                 "web3-utils": "1.0.0-beta.35"
@@ -13568,8 +13453,7 @@
                 "bn.js": {
                   "version": "4.11.6",
                   "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
-                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU=",
-                  "optional": true
+                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
                 }
               }
             },
@@ -13577,7 +13461,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-eth-personal/-/web3-eth-personal-1.0.0-beta.35.tgz",
               "integrity": "sha512-AcM9nnlxu7ZRRxPvkrFB9eLxMM4A2cPfj2aCg21Wb2EpMnhR+b/O1cT33k7ApRowoMpM+T9M8vx2oPNwXfaCOQ==",
-              "optional": true,
               "requires": {
                 "web3-core": "1.0.0-beta.35",
                 "web3-core-helpers": "1.0.0-beta.35",
@@ -13590,7 +13473,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-net/-/web3-net-1.0.0-beta.35.tgz",
               "integrity": "sha512-bbwaQ/KohGjIJ6HAKbZ6KrklCAaG6/B7hIbAbVLSFLxF+Yz9lmAgQYaDInpidpC/NLb3WOmcbRF+P77J4qMVIA==",
-              "optional": true,
               "requires": {
                 "web3-core": "1.0.0-beta.35",
                 "web3-core-method": "1.0.0-beta.35",
@@ -13672,7 +13554,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-providers-http/-/web3-providers-http-1.0.0-beta.35.tgz",
               "integrity": "sha512-DcIMFq52Fb08UpWyZ3ZlES6NsNqJnco4hBS/Ej6eOcASfuUayPI+GLkYVZsnF3cBYqlH+DOKuArcKSuIxK7jIA==",
-              "optional": true,
               "requires": {
                 "web3-core-helpers": "1.0.0-beta.35",
                 "xhr2-cookies": "1.1.0"
@@ -13682,7 +13563,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-providers-ipc/-/web3-providers-ipc-1.0.0-beta.35.tgz",
               "integrity": "sha512-iB0FG0HcpUnayfa8pn4guqEQ4Y1nrroi/jffdtQgFkrNt0sD3fMSwwC0AbmECqj3tDLl0e1slBR0RENll+ZF0g==",
-              "optional": true,
               "requires": {
                 "oboe": "2.1.3",
                 "underscore": "1.8.3",
@@ -13693,7 +13573,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-providers-ws/-/web3-providers-ws-1.0.0-beta.35.tgz",
               "integrity": "sha512-Cx64NgDStynKaUGDIIOfaCd0fZusL8h5avKTkdTjUu2aHhFJhZoVBGVLhoDtUaqZGWIZGcBJOoVf2JkGUOjDRQ==",
-              "optional": true,
               "requires": {
                 "underscore": "1.8.3",
                 "web3-core-helpers": "1.0.0-beta.35",
@@ -13704,7 +13583,6 @@
                   "version": "2.6.9",
                   "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
                   "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-                  "optional": true,
                   "requires": {
                     "ms": "2.0.0"
                   }
@@ -13712,7 +13590,6 @@
                 "websocket": {
                   "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
                   "from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
-                  "optional": true,
                   "requires": {
                     "debug": "^2.2.0",
                     "nan": "^2.3.3",
@@ -13738,7 +13615,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.0.0-beta.35.tgz",
               "integrity": "sha512-Dq6f0SOKj3BDFRgOPnE6ALbzBDCKVIW8mKWVf7tGVhTDHf+wQaWwQSC3aArFSqdExB75BPBPyDpuMTNszhljpA==",
-              "optional": true,
               "requires": {
                 "bn.js": "4.11.6",
                 "eth-lib": "0.1.27",
@@ -13752,14 +13628,12 @@
                 "bn.js": {
                   "version": "4.11.6",
                   "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
-                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU=",
-                  "optional": true
+                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
                 },
                 "utf8": {
                   "version": "2.1.1",
                   "resolved": "https://registry.npmjs.org/utf8/-/utf8-2.1.1.tgz",
-                  "integrity": "sha1-LgHbAvfY0JRPdxBPFgnrDDBM92g=",
-                  "optional": true
+                  "integrity": "sha1-LgHbAvfY0JRPdxBPFgnrDDBM92g="
                 }
               }
             },
@@ -13817,7 +13691,6 @@
               "version": "3.3.3",
               "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
               "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
-              "optional": true,
               "requires": {
                 "async-limiter": "~1.0.0",
                 "safe-buffer": "~5.1.0",
@@ -13839,7 +13712,6 @@
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
               "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
-              "optional": true,
               "requires": {
                 "buffer-to-arraybuffer": "^0.0.5",
                 "object-assign": "^4.1.1",
@@ -13854,7 +13726,6 @@
               "version": "0.1.2",
               "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.2.tgz",
               "integrity": "sha1-NDxE0e53JrhkgGloLQ+EDIO0Jh0=",
-              "optional": true,
               "requires": {
                 "xhr-request": "^1.0.1"
               }
@@ -13863,7 +13734,6 @@
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz",
               "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
-              "optional": true,
               "requires": {
                 "cookiejar": "^2.1.1"
               }
diff --git a/apps/contributor/contracts/Contributor.sol b/apps/contributor/contracts/Contributor.sol
index 0b595c1..9dcab19 100644
--- a/apps/contributor/contracts/Contributor.sol
+++ b/apps/contributor/contracts/Contributor.sol
@@ -64,10 +64,13 @@ contract Contributor is AragonApp {
   }
 
   function updateContributorAccount(uint32 id, address oldAccount, address newAccount) public auth(MANAGE_CONTRIBUTORS_ROLE) {
+    require(newAccount != address(0), "invalid new account address");
+    require(getContributorAddressById(id) == oldAccount, "contributor does not exist");
+
     contributorIds[oldAccount] = 0;
     contributorIds[newAccount] = id;
     contributors[id].account = newAccount;
-    ContributorAccountUpdated(id, oldAccount, newAccount);
+    emit ContributorAccountUpdated(id, oldAccount, newAccount);
   }
 
   function updateContributorProfileHash(uint32 id, bytes32 hashDigest, uint8 hashFunction, uint8 hashSize) public isInitialized auth(MANAGE_CONTRIBUTORS_ROLE) {
diff --git a/apps/contributor/contracts/test/Spoof.sol b/apps/contributor/contracts/test/Spoof.sol
new file mode 100644
index 0000000..34fb889
--- /dev/null
+++ b/apps/contributor/contracts/test/Spoof.sol
@@ -0,0 +1,16 @@
+pragma solidity ^0.4.24;
+
+import "@aragon/os/contracts/acl/ACL.sol";
+import "@aragon/os/contracts/kernel/Kernel.sol";
+import "@aragon/os/contracts/factory/DAOFactory.sol";
+
+// You might think this file is a bit odd, but let me explain.
+// We only use for now those imported contracts in our tests, which
+// means Truffle will not compile them for us, because they are from
+// an external dependency.
+
+
+// solium-disable-next-line no-empty-blocks
+contract Spoof {
+  // ...
+}
diff --git a/apps/contributor/package-lock.json b/apps/contributor/package-lock.json
index efd8ceb..16bb683 100644
--- a/apps/contributor/package-lock.json
+++ b/apps/contributor/package-lock.json
@@ -7751,6 +7751,7 @@
             "minipass": {
               "version": "2.3.5",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.2",
                 "yallist": "^3.0.0"
@@ -7767,6 +7768,7 @@
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -7850,6 +7852,7 @@
             "once": {
               "version": "1.4.0",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -7925,7 +7928,8 @@
             },
             "safe-buffer": {
               "version": "5.1.2",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -8017,7 +8021,8 @@
             },
             "yallist": {
               "version": "3.0.3",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             }
           }
         },
@@ -8099,7 +8104,6 @@
               "version": "1.3.5",
               "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
               "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
-              "optional": true,
               "requires": {
                 "mime-types": "~2.1.18",
                 "negotiator": "0.6.1"
@@ -8135,14 +8139,12 @@
             "any-promise": {
               "version": "1.3.0",
               "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
-              "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8=",
-              "optional": true
+              "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
             },
             "array-flatten": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-              "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
-              "optional": true
+              "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
             },
             "asn1": {
               "version": "0.2.4",
@@ -8156,7 +8158,6 @@
               "version": "4.10.1",
               "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
               "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
-              "optional": true,
               "requires": {
                 "bn.js": "^4.0.0",
                 "inherits": "^2.0.1",
@@ -8850,8 +8851,7 @@
             "base64-js": {
               "version": "1.3.0",
               "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
-              "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw==",
-              "optional": true
+              "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw=="
             },
             "bcrypt-pbkdf": {
               "version": "1.0.2",
@@ -8893,7 +8893,6 @@
               "version": "1.2.2",
               "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
               "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
-              "optional": true,
               "requires": {
                 "readable-stream": "^2.3.5",
                 "safe-buffer": "^5.1.1"
@@ -8923,7 +8922,6 @@
               "version": "1.18.3",
               "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
               "integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
-              "optional": true,
               "requires": {
                 "bytes": "3.0.0",
                 "content-type": "~1.0.4",
@@ -8941,7 +8939,6 @@
                   "version": "2.6.9",
                   "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
                   "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-                  "optional": true,
                   "requires": {
                     "ms": "2.0.0"
                   }
@@ -9002,7 +8999,6 @@
               "version": "4.0.1",
               "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
               "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
-              "optional": true,
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                 "bn.js": "^4.1.0",
                 "randombytes": "^2.0.1"
@@ -9065,7 +9061,6 @@
               "version": "5.2.1",
               "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.2.1.tgz",
               "integrity": "sha512-c+Ko0loDaFfuPWiL02ls9Xd3GO3cPVmUobQ6t3rXNUk304u6hGq+8N/kFi+QEIKhzK3uwolVhLzszmfLmMLnqg==",
-              "optional": true,
               "requires": {
                 "base64-js": "^1.0.2",
                 "ieee754": "^1.1.4"
@@ -9075,7 +9070,6 @@
               "version": "1.2.0",
               "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
               "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
-              "optional": true,
               "requires": {
                 "buffer-alloc-unsafe": "^1.1.0",
                 "buffer-fill": "^1.0.0"
@@ -9084,8 +9078,7 @@
             "buffer-alloc-unsafe": {
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
-              "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==",
-              "optional": true
+              "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg=="
             },
             "buffer-crc32": {
               "version": "0.2.13",
@@ -9096,8 +9089,7 @@
             "buffer-fill": {
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
-              "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
-              "optional": true
+              "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw="
             },
             "buffer-from": {
               "version": "1.1.1",
@@ -9107,8 +9099,7 @@
             "buffer-to-arraybuffer": {
               "version": "0.0.5",
               "resolved": "https://registry.npmjs.org/buffer-to-arraybuffer/-/buffer-to-arraybuffer-0.0.5.tgz",
-              "integrity": "sha1-YGSkD6dutDxyOrqe+PbhIW0QURo=",
-              "optional": true
+              "integrity": "sha1-YGSkD6dutDxyOrqe+PbhIW0QURo="
             },
             "buffer-xor": {
               "version": "1.0.3",
@@ -9118,8 +9109,7 @@
             "bytes": {
               "version": "3.0.0",
               "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
-              "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg=",
-              "optional": true
+              "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
             },
             "bytewise": {
               "version": "1.1.0",
@@ -9251,7 +9241,6 @@
               "version": "2.8.1",
               "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
               "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
-              "optional": true,
               "requires": {
                 "graceful-readlink": ">= 1.0.0"
               }
@@ -9275,14 +9264,12 @@
             "content-disposition": {
               "version": "0.5.2",
               "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
-              "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
-              "optional": true
+              "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ="
             },
             "content-type": {
               "version": "1.0.4",
               "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
-              "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==",
-              "optional": true
+              "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
             },
             "convert-source-map": {
               "version": "1.6.0",
@@ -9295,20 +9282,17 @@
             "cookie": {
               "version": "0.3.1",
               "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-              "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=",
-              "optional": true
+              "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
             },
             "cookie-signature": {
               "version": "1.0.6",
               "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
-              "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw=",
-              "optional": true
+              "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
             },
             "cookiejar": {
               "version": "2.1.2",
               "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.2.tgz",
-              "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA==",
-              "optional": true
+              "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA=="
             },
             "core-js": {
               "version": "2.6.5",
@@ -9324,7 +9308,6 @@
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               "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
               "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
-              "optional": true,
               "requires": {
                 "object-assign": "^4",
                 "vary": "^1"
@@ -9417,8 +9400,7 @@
             "decode-uri-component": {
               "version": "0.2.0",
               "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
-              "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
-              "optional": true
+              "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU="
             },
             "decompress": {
               "version": "4.2.0",
@@ -9448,7 +9430,6 @@
               "version": "3.3.0",
               "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-3.3.0.tgz",
               "integrity": "sha1-gKTdMjdIOEv6JICDYirt7Jgq3/M=",
-              "optional": true,
               "requires": {
                 "mimic-response": "^1.0.0"
               }
@@ -9457,7 +9438,6 @@
               "version": "4.1.1",
               "resolved": "https://registry.npmjs.org/decompress-tar/-/decompress-tar-4.1.1.tgz",
               "integrity": "sha512-JdJMaCrGpB5fESVyxwpCx4Jdj2AagLmv3y58Qy4GE6HMVjWz1FeVQk1Ct4Kye7PftcdOo/7U7UKzYBJgqnGeUQ==",
-              "optional": true,
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@@ -9583,8 +9563,7 @@
             "depd": {
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               "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
-              "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
-              "optional": true
+              "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
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@@ -9599,8 +9578,7 @@
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-              "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
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+              "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
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@@ -9639,8 +9617,7 @@
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-              "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
-              "optional": true
+              "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI="
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@@ -9654,8 +9631,7 @@
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-              "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=",
-              "optional": true
+              "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
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@@ -9679,8 +9655,7 @@
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-              "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=",
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+              "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
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@@ -9769,8 +9744,7 @@
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-              "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg=",
-              "optional": true
+              "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
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@@ -9785,8 +9759,7 @@
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-              "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
-              "optional": true
+              "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
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@@ -9864,7 +9837,6 @@
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@@ -10279,7 +10251,6 @@
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-              "optional": true,
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@@ -10288,8 +10259,7 @@
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-                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU=",
-                  "optional": true
+                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
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@@ -10305,8 +10275,7 @@
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-              "integrity": "sha1-R3hr2qCHyvext15zq8XH1UAVjNA=",
-              "optional": true
+              "integrity": "sha1-R3hr2qCHyvext15zq8XH1UAVjNA="
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@@ -10326,7 +10295,6 @@
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@@ -10364,7 +10332,6 @@
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@@ -10372,8 +10339,7 @@
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+                  "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew=="
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@@ -10436,8 +10402,7 @@
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@@ -10463,7 +10427,6 @@
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@@ -10471,8 +10434,7 @@
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-                  "optional": true
+                  "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew=="
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@@ -10511,26 +10473,22 @@
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-              "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ=",
-              "optional": true
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+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/idna-uts46-hx/-/idna-uts46-hx-2.3.1.tgz",
+      "integrity": "sha512-PWoF9Keq6laYdIRwwCdhTPl60xRqAloYNMQLiyUnG42VjT53oW07BXIRM+NK7eQjzXjAk2gUvX9caRxlnF9TAA==",
+      "dev": true,
+      "requires": {
+        "punycode": "2.1.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.0.tgz",
+          "integrity": "sha1-X4Y+3Im5bbCQdLrXlHvwkFbKTn0=",
+          "dev": true
+        }
+      }
+    },
     "immediate": {
       "version": "3.2.3",
       "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.2.3.tgz",
diff --git a/apps/contributor/package.json b/apps/contributor/package.json
index 5d5bdd3..3eb3a9b 100644
--- a/apps/contributor/package.json
+++ b/apps/contributor/package.json
@@ -7,7 +7,6 @@
     "@aragon/cli": "^5.9.6"
   },
   "devDependencies": {
-    "@aragon/test-helpers": "^1.1.0",
     "eth-gas-reporter": "^0.2.0",
     "ganache-cli": "^6.4.3",
     "solidity-coverage": "^0.5.11"
@@ -29,7 +28,7 @@
     "test": "TRUFFLE_TEST=true PORT=7545 npm run ganache-cli:test",
     "test:gas": "GAS_REPORTER=true npm test",
     "coverage": "SOLIDITY_COVERAGE=true npm run ganache-cli:test",
-    "ganache-cli:test": "./node_modules/@aragon/test-helpers/ganache-cli.sh"
+    "ganache-cli:test": "../../scripts/ganache-cli.sh"
   },
   "keywords": []
 }
diff --git a/apps/contributor/test/app.js b/apps/contributor/test/app.js
deleted file mode 100644
index 9985ba6..0000000
--- a/apps/contributor/test/app.js
+++ /dev/null
@@ -1,5 +0,0 @@
-// const Contributor = artifacts.require('Contributor.sol');
-
-contract('Contributor', (_accounts) => {
-  it('should be tested');
-});
diff --git a/apps/contributor/test/contributor.js b/apps/contributor/test/contributor.js
new file mode 100644
index 0000000..a7812c6
--- /dev/null
+++ b/apps/contributor/test/contributor.js
@@ -0,0 +1,170 @@
+const namehash = require('ethers').utils.namehash;
+
+// eslint-disable-next-line no-undef
+const Contributor = artifacts.require("Contributor.sol");
+
+// eslint-disable-next-line no-undef
+const getContract = name => artifacts.require(name);
+const { assertRevert } = require('@aragon/test-helpers/assertThrow');
+
+const ZERO_ADDR = '0x0000000000000000000000000000000000000000';
+
+contract('Contributor app', (accounts) => {
+  let kernelBase, aclBase, daoFactory, r, dao, acl, contributor;
+
+  const root = accounts[0];
+  const member1 = accounts[1];
+
+  // eslint-disable-next-line no-undef
+  before(async () => {
+    kernelBase = await getContract('Kernel').new(true); // petrify immediately
+    aclBase = await getContract('ACL').new();
+    daoFactory = await getContract('DAOFactory').new(kernelBase.address, aclBase.address, ZERO_ADDR);
+    r = await daoFactory.newDAO(root);
+    dao = getContract('Kernel').at(r.logs.filter(l => l.event == 'DeployDAO')[0].args.dao);
+    acl = getContract('ACL').at(await dao.acl());
+
+    //create dao mamnager permission for coin owner
+    await acl.createPermission(
+      root,
+      dao.address,
+      await dao.APP_MANAGER_ROLE(),
+      root,
+      { from: root }
+    );
+
+    //get new app instance from DAO
+    const receipt = await dao.newAppInstance(
+      '0x1234',
+      (await Contributor.new()).address,
+      0x0,
+      false,
+      { from: root }
+    );
+    contributor = Contributor.at(
+      receipt.logs.filter(l => l.event == 'NewAppProxy')[0].args.proxy
+    );
+
+    //apps id
+    let appsId = [];
+    appsId[0] = namehash("kredits-contribution");
+    appsId[1] = namehash("kredits-contributor");
+    appsId[2] = namehash("kredits-proposal");
+    appsId[3] = namehash("kredits-token");
+
+    //init contributor (app)
+    await contributor.initialize(root, appsId);
+
+    //create manage contributors role
+    await acl.createPermission(
+      root,
+      contributor.address,
+      await contributor.MANAGE_CONTRIBUTORS_ROLE(),
+      root,
+      { from: root }
+    );
+  
+  });
+
+  describe("Owner default space permissions", async () => {
+    it('check owner is token issuer', async () => {
+      let manageContributorPermission = await acl.hasPermission(root, contributor.address, await contributor.MANAGE_CONTRIBUTORS_ROLE());
+      // eslint-disable-next-line no-undef
+      assert.equal(manageContributorPermission, true);
+    });  
+  });
+
+  describe("Add contributor", async () => {
+    let account = root;
+    let hashDigest = '0x0';
+    let hashFunction = 0;
+    let hashSize = 0;
+
+    it("should revert when add contributor from an address that does not have permission", async () => {
+      return assertRevert(async () => {
+        await contributor.addContributor(account, hashDigest, hashFunction, hashSize, { from: member1});
+        'sender does not have permission';
+      });
+    });
+
+    it('add contributor', async () => {
+      let contributorCount = await contributor.coreContributorsCount();
+      await contributor.addContributor(account, hashDigest, hashFunction, hashSize);
+      // eslint-disable-next-line no-undef
+      assert.equal(await contributor.addressExists(account), true);
+      let contributorCountAfter = await contributor.coreContributorsCount();
+      // eslint-disable-next-line no-undef
+      assert.equal(await contributorCountAfter.toNumber(), parseInt(contributorCount)+1);
+    });
+
+    it("should revert when add contributor with an address that already exist", async () => {
+      return assertRevert(async () => {
+        await contributor.addContributor(account, hashDigest, hashFunction, hashSize, { from: member1});
+        'address already exist';
+      });
+    });
+  });
+
+  describe("Update contributor", async () => {
+    let id;
+    let oldAccount;
+    let newAccount;
+    let hashDigest;
+    let hashFunction;
+    let hashSize;
+
+    // eslint-disable-next-line no-undef
+    before(async () =>  {
+      id = await contributor.coreContributorsCount();
+      oldAccount = root;
+      newAccount = member1;
+      hashDigest = '0x1000000000000000000000000000000000000000000000000000000000000000';
+      hashFunction = 1;
+      hashSize = 1;
+    });
+
+    it('update contributor account', async () => {
+      await contributor.updateContributorAccount(id.toNumber(), oldAccount, newAccount);
+      let contributorId = await contributor.getContributorIdByAddress(oldAccount);
+      // eslint-disable-next-line no-undef
+      assert.equal(contributorId.toNumber(), 0);
+    });
+
+    it("should revert when update contributor account from address that does not have permission", async () => {
+      return assertRevert(async () => {
+        await contributor.updateContributorAccount(id.toNumber(), oldAccount, newAccount, {from: member1});
+        'sender does not have permission';
+      });
+    });
+
+    it("should revert when update contributor account that does not exist", async () => {
+      return assertRevert(async () => {
+        await contributor.updateContributorAccount(id.toNumber(), accounts[3], newAccount);
+        'contributor does not exist';
+      });
+    });
+
+    it("should revert when update contributor account with address(0)", async () => {
+      return assertRevert(async () => {
+        await contributor.updateContributorAccount(id.toNumber(), oldAccount, ZERO_ADDR);
+        'contributor does not exist';
+      });
+    });
+
+    it('update contributor profile hash', async () => {
+      await contributor.updateContributorProfileHash(id.toNumber(), hashDigest, hashFunction, hashSize);
+      let contributorProfile = await contributor.contributors(id.toNumber());
+      assert.equal(hashDigest, contributorProfile[1]);    // eslint-disable-line no-undef
+      assert.equal(hashFunction, contributorProfile[2].toNumber());   // eslint-disable-line no-undef
+      assert.equal(hashSize, contributorProfile[3].toNumber());   // eslint-disable-line no-undef
+    });
+
+    it("should revert when update contributor profile hash from address that does not have permission", async () => {
+      return assertRevert(async () => {
+        await contributor.updateContributorProfileHash(id.toNumber(), hashDigest, hashFunction, hashSize, {from: member1});
+        'sender does not have permission';
+      });
+    });
+
+  });
+});
diff --git a/apps/proposal/package-lock.json b/apps/proposal/package-lock.json
index 3b0a5de..de87cdf 100644
--- a/apps/proposal/package-lock.json
+++ b/apps/proposal/package-lock.json
@@ -7751,6 +7751,7 @@
             "minipass": {
               "version": "2.3.5",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.2",
                 "yallist": "^3.0.0"
@@ -7767,6 +7768,7 @@
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -7850,6 +7852,7 @@
             "once": {
               "version": "1.4.0",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -8099,7 +8102,6 @@
               "version": "1.3.5",
               "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
               "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
-              "optional": true,
               "requires": {
                 "mime-types": "~2.1.18",
                 "negotiator": "0.6.1"
@@ -8135,14 +8137,12 @@
             "any-promise": {
               "version": "1.3.0",
               "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
-              "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8=",
-              "optional": true
+              "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
             },
             "array-flatten": {
               "version": "1.1.1",
               "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-              "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
-              "optional": true
+              "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
             },
             "asn1": {
               "version": "0.2.4",
@@ -8156,7 +8156,6 @@
               "version": "4.10.1",
               "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
               "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
-              "optional": true,
               "requires": {
                 "bn.js": "^4.0.0",
                 "inherits": "^2.0.1",
@@ -8850,8 +8849,7 @@
             "base64-js": {
               "version": "1.3.0",
               "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
-              "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw==",
-              "optional": true
+              "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw=="
             },
             "bcrypt-pbkdf": {
               "version": "1.0.2",
@@ -8893,7 +8891,6 @@
               "version": "1.2.2",
               "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
               "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
-              "optional": true,
               "requires": {
                 "readable-stream": "^2.3.5",
                 "safe-buffer": "^5.1.1"
@@ -8923,7 +8920,6 @@
               "version": "1.18.3",
               "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
               "integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
-              "optional": true,
               "requires": {
                 "bytes": "3.0.0",
                 "content-type": "~1.0.4",
@@ -8941,7 +8937,6 @@
                   "version": "2.6.9",
                   "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
                   "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-                  "optional": true,
                   "requires": {
                     "ms": "2.0.0"
                   }
@@ -9002,7 +8997,6 @@
               "version": "4.0.1",
               "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
               "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
-              "optional": true,
               "requires": {
                 "bn.js": "^4.1.0",
                 "randombytes": "^2.0.1"
@@ -9065,7 +9059,6 @@
               "version": "5.2.1",
               "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.2.1.tgz",
               "integrity": "sha512-c+Ko0loDaFfuPWiL02ls9Xd3GO3cPVmUobQ6t3rXNUk304u6hGq+8N/kFi+QEIKhzK3uwolVhLzszmfLmMLnqg==",
-              "optional": true,
               "requires": {
                 "base64-js": "^1.0.2",
                 "ieee754": "^1.1.4"
@@ -9075,7 +9068,6 @@
               "version": "1.2.0",
               "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
               "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
-              "optional": true,
               "requires": {
                 "buffer-alloc-unsafe": "^1.1.0",
                 "buffer-fill": "^1.0.0"
@@ -9084,8 +9076,7 @@
             "buffer-alloc-unsafe": {
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
-              "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==",
-              "optional": true
+              "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg=="
             },
             "buffer-crc32": {
               "version": "0.2.13",
@@ -9096,8 +9087,7 @@
             "buffer-fill": {
               "version": "1.0.0",
               "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
-              "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
-              "optional": true
+              "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw="
             },
             "buffer-from": {
               "version": "1.1.1",
@@ -9107,8 +9097,7 @@
             "buffer-to-arraybuffer": {
               "version": "0.0.5",
               "resolved": "https://registry.npmjs.org/buffer-to-arraybuffer/-/buffer-to-arraybuffer-0.0.5.tgz",
-              "integrity": "sha1-YGSkD6dutDxyOrqe+PbhIW0QURo=",
-              "optional": true
+              "integrity": "sha1-YGSkD6dutDxyOrqe+PbhIW0QURo="
             },
             "buffer-xor": {
               "version": "1.0.3",
@@ -9118,8 +9107,7 @@
             "bytes": {
               "version": "3.0.0",
               "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
-              "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg=",
-              "optional": true
+              "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
             },
             "bytewise": {
               "version": "1.1.0",
@@ -9251,7 +9239,6 @@
               "version": "2.8.1",
               "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
               "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
-              "optional": true,
               "requires": {
                 "graceful-readlink": ">= 1.0.0"
               }
@@ -9275,14 +9262,12 @@
             "content-disposition": {
               "version": "0.5.2",
               "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
-              "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
-              "optional": true
+              "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ="
             },
             "content-type": {
               "version": "1.0.4",
               "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
-              "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==",
-              "optional": true
+              "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
             },
             "convert-source-map": {
               "version": "1.6.0",
@@ -9295,20 +9280,17 @@
             "cookie": {
               "version": "0.3.1",
               "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-              "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=",
-              "optional": true
+              "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
             },
             "cookie-signature": {
               "version": "1.0.6",
               "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
-              "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw=",
-              "optional": true
+              "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
             },
             "cookiejar": {
               "version": "2.1.2",
               "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.2.tgz",
-              "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA==",
-              "optional": true
+              "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA=="
             },
             "core-js": {
               "version": "2.6.5",
@@ -9324,7 +9306,6 @@
               "version": "2.8.5",
               "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
               "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
-              "optional": true,
               "requires": {
                 "object-assign": "^4",
                 "vary": "^1"
@@ -9417,8 +9398,7 @@
             "decode-uri-component": {
               "version": "0.2.0",
               "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
-              "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
-              "optional": true
+              "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU="
             },
             "decompress": {
               "version": "4.2.0",
@@ -9448,7 +9428,6 @@
               "version": "3.3.0",
               "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-3.3.0.tgz",
               "integrity": "sha1-gKTdMjdIOEv6JICDYirt7Jgq3/M=",
-              "optional": true,
               "requires": {
                 "mimic-response": "^1.0.0"
               }
@@ -9457,7 +9436,6 @@
               "version": "4.1.1",
               "resolved": "https://registry.npmjs.org/decompress-tar/-/decompress-tar-4.1.1.tgz",
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-              "optional": true,
               "requires": {
                 "file-type": "^5.2.0",
                 "is-stream": "^1.1.0",
@@ -9583,8 +9561,7 @@
             "depd": {
               "version": "1.1.2",
               "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
-              "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
-              "optional": true
+              "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
             },
             "des.js": {
               "version": "1.0.0",
@@ -9599,8 +9576,7 @@
             "destroy": {
               "version": "1.0.4",
               "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
-              "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
-              "optional": true
+              "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
             },
             "detect-indent": {
               "version": "4.0.0",
@@ -9639,8 +9615,7 @@
             "duplexer3": {
               "version": "0.1.4",
               "resolved": "https://registry.npmjs.org/duplexer3/-/duplexer3-0.1.4.tgz",
-              "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
-              "optional": true
+              "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI="
             },
             "ecc-jsbn": {
               "version": "0.1.2",
@@ -9654,8 +9629,7 @@
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diff --git a/apps/token/package-lock.json b/apps/token/package-lock.json
index 9bc5dfa..98e85ef 100644
--- a/apps/token/package-lock.json
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               "resolved": "https://registry.npmjs.org/web3-providers-ws/-/web3-providers-ws-1.0.0-beta.35.tgz",
               "integrity": "sha512-Cx64NgDStynKaUGDIIOfaCd0fZusL8h5avKTkdTjUu2aHhFJhZoVBGVLhoDtUaqZGWIZGcBJOoVf2JkGUOjDRQ==",
-              "optional": true,
               "requires": {
                 "underscore": "1.8.3",
                 "web3-core-helpers": "1.0.0-beta.35",
@@ -13704,7 +13583,6 @@
                   "version": "2.6.9",
                   "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
                   "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-                  "optional": true,
                   "requires": {
                     "ms": "2.0.0"
                   }
@@ -13712,7 +13590,6 @@
                 "websocket": {
                   "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
                   "from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
-                  "optional": true,
                   "requires": {
                     "debug": "^2.2.0",
                     "nan": "^2.3.3",
@@ -13738,7 +13615,6 @@
               "version": "1.0.0-beta.35",
               "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.0.0-beta.35.tgz",
               "integrity": "sha512-Dq6f0SOKj3BDFRgOPnE6ALbzBDCKVIW8mKWVf7tGVhTDHf+wQaWwQSC3aArFSqdExB75BPBPyDpuMTNszhljpA==",
-              "optional": true,
               "requires": {
                 "bn.js": "4.11.6",
                 "eth-lib": "0.1.27",
@@ -13752,14 +13628,12 @@
                 "bn.js": {
                   "version": "4.11.6",
                   "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
-                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU=",
-                  "optional": true
+                  "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
                 },
                 "utf8": {
                   "version": "2.1.1",
                   "resolved": "https://registry.npmjs.org/utf8/-/utf8-2.1.1.tgz",
-                  "integrity": "sha1-LgHbAvfY0JRPdxBPFgnrDDBM92g=",
-                  "optional": true
+                  "integrity": "sha1-LgHbAvfY0JRPdxBPFgnrDDBM92g="
                 }
               }
             },
@@ -13817,7 +13691,6 @@
               "version": "3.3.3",
               "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
               "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
-              "optional": true,
               "requires": {
                 "async-limiter": "~1.0.0",
                 "safe-buffer": "~5.1.0",
@@ -13839,7 +13712,6 @@
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
               "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
-              "optional": true,
               "requires": {
                 "buffer-to-arraybuffer": "^0.0.5",
                 "object-assign": "^4.1.1",
@@ -13854,7 +13726,6 @@
               "version": "0.1.2",
               "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.2.tgz",
               "integrity": "sha1-NDxE0e53JrhkgGloLQ+EDIO0Jh0=",
-              "optional": true,
               "requires": {
                 "xhr-request": "^1.0.1"
               }
@@ -13863,7 +13734,6 @@
               "version": "1.1.0",
               "resolved": "https://registry.npmjs.org/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz",
               "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
-              "optional": true,
               "requires": {
                 "cookiejar": "^2.1.1"
               }
diff --git a/lib/serializers/contributor.js b/lib/serializers/contributor.js
index 71afa31..dc9c708 100644
--- a/lib/serializers/contributor.js
+++ b/lib/serializers/contributor.js
@@ -13,7 +13,7 @@ class Contributor {
     Object.keys(attrs).forEach(a => this[a] = attrs[a]);
   }
 
- /**
+  /**
   * Serialize object to JSON
   *
   * @method
diff --git a/package.json b/package.json
index bfe3b93..ce2000c 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "lint:contracts": "solhint \"contracts/**/*.sol\" \"apps/*/contracts/**/*.sol\"",
     "lint:contract-tests": "eslint apps/*/test",
     "lint:wrapper": "eslint lib/",
+    "test": "npm run test:token && npm run test:contributor && npm run test:contribution && npm run test:proposal",
     "test:token": "cd apps/token && npm run test",
     "test:contributor": "cd apps/contributor && npm run test",
     "test:contribution": "cd apps/contribution && npm run test",
diff --git a/scripts/ganache-cli.sh b/scripts/ganache-cli.sh
new file mode 100755
index 0000000..a153031
--- /dev/null
+++ b/scripts/ganache-cli.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Exit script as soon as a command fails.
+set -o errexit
+
+# Executes cleanup function at script exit.
+trap cleanup EXIT
+
+cleanup() {
+  # Kill the RPC instance that we started (if we started one and if it's still running).
+  if [ -n "$rpc_pid" ] && ps -p $rpc_pid > /dev/null; then
+    kill -9 $rpc_pid
+  fi
+}
+
+setup_coverage_variables() {
+  PORT=${PORT-8555}
+  BALANCE=${BALANCE-100000}
+  GAS_LIMIT=${GAS_LIMIT-0xfffffffffff}
+  NETWORK_ID=${NETWORK_ID-16}
+}
+
+setup_testing_variables() {
+  PORT=${PORT-8545}
+  BALANCE=${BALANCE-100000}
+  GAS_LIMIT=${GAS_LIMIT-8000000}
+  NETWORK_ID=${NETWORK_ID-15}
+}
+
+start_ganache() {
+  echo "Starting ganache-cli..."
+  npx ganache-cli -i ${NETWORK_ID} -l ${GAS_LIMIT} -e ${BALANCE} -p ${PORT} > /dev/null &
+  rpc_pid=$!
+  sleep 3
+  echo "Running ganache-cli with pid ${rpc_pid} in port ${PORT}"
+}
+
+start_testrpc() {
+  echo "Starting testrpc-sc..."
+  npx testrpc-sc -i ${NETWORK_ID} -l ${GAS_LIMIT} -e ${BALANCE} -p ${PORT} > /dev/null &
+  rpc_pid=$!
+  sleep 3
+  echo "Running testrpc-sc with pid ${rpc_pid} in port ${PORT}"
+}
+
+measure_coverage() {
+  echo "Measuring coverage..."
+  npx solidity-coverage "$@"
+}
+
+run_tests() {
+  echo "Running tests..."
+  npx aragon contracts test --network rpc "$@"
+}
+
+if [ "$SOLIDITY_COVERAGE" = true ]; then
+  setup_coverage_variables
+  start_testrpc
+  measure_coverage
+else
+  setup_testing_variables
+  start_ganache
+  run_tests
+fi