diff --git a/.eslintignore b/.eslintignore
index 6633896..2ba1088 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1 +1,2 @@
 /scripts/
+/test/
diff --git a/package-lock.json b/package-lock.json
index c07d67b..ca5efda 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,11 +17,13 @@
         "tv4": "^1.3.0"
       },
       "devDependencies": {
+        "@nomicfoundation/hardhat-chai-matchers": "^1.0.3",
         "@nomiclabs/hardhat-ethers": "^2.0.2",
         "@nomiclabs/hardhat-waffle": "^2.0.1",
         "@openzeppelin/contracts-upgradeable": "^4.3.2",
         "@openzeppelin/hardhat-upgrades": "^1.10.0",
         "async-each-series": "^1.1.0",
+        "chai": "^4.3.6",
         "cli-table": "^0.3.1",
         "colors": "^1.0.3",
         "eslint": "^8.14.0",
@@ -35,6 +37,7 @@
         "hardhat-deploy": "^0.11.4",
         "hardhat-deploy-ethers": "^0.3.0-beta.10",
         "homedir": "^0.6.0",
+        "mocha": "^10.0.0",
         "promptly": "^3.0.3",
         "solhint": "^3.3.7",
         "truffle-hdwallet-provider": "^1.0.17",
@@ -1084,6 +1087,121 @@
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+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.1.2.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ]
+    },
+    "node_modules/@noble/secp256k1": {
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+      "resolved": "https://registry.npmjs.org/@noble/secp256k1/-/secp256k1-1.6.3.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ]
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@nomicfoundation/hardhat-chai-matchers/-/hardhat-chai-matchers-1.0.3.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "@types/chai-as-promised": "^7.1.3",
+        "chai-as-promised": "^7.1.1",
+        "chalk": "^2.4.2",
+        "deep-eql": "^4.0.1",
+        "ordinal": "^1.0.3"
+      },
+      "peerDependencies": {
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+        "chai": "^4.2.0",
+        "ethers": "^5.0.0",
+        "hardhat": "^2.9.4"
+      }
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
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+      "dependencies": {
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+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
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+      "dev": true,
+      "dependencies": {
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+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/color-convert": {
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+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
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+      "dev": true,
+      "dependencies": {
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+      }
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
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+      "dev": true
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/escape-string-regexp": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/has-flag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@nomicfoundation/hardhat-chai-matchers/node_modules/supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/@nomiclabs/hardhat-ethers": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.5.tgz",
@@ -1271,6 +1389,51 @@
         "ms": "^2.1.1"
       }
     },
+    "node_modules/@scure/base": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.1.1.tgz",
+      "integrity": "sha512-ZxOhsSyxYwLJj3pLZCefNitxsj093tb2vq90mp2txoYeBqbcjDjqFhyM8eUjq/uFm6zJ+mUuqxlS2FkuSY1MTA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ]
+    },
+    "node_modules/@scure/bip32": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@scure/bip32/-/bip32-1.1.0.tgz",
+      "integrity": "sha512-ftTW3kKX54YXLCxH6BB7oEEoJfoE2pIgw7MINKAs5PsS6nqKPuKk1haTF/EuHmYqG330t5GSrdmtRuHaY1a62Q==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ],
+      "dependencies": {
+        "@noble/hashes": "~1.1.1",
+        "@noble/secp256k1": "~1.6.0",
+        "@scure/base": "~1.1.0"
+      }
+    },
+    "node_modules/@scure/bip39": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@scure/bip39/-/bip39-1.1.0.tgz",
+      "integrity": "sha512-pwrPOS16VeTKg98dYXQyIjJEcWfz7/1YJIwxUEPFfQPtc86Ym/1sVgQ2RLoD43AazMk2l/unK4ITySSpW2+82w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ],
+      "dependencies": {
+        "@noble/hashes": "~1.1.1",
+        "@scure/base": "~1.1.0"
+      }
+    },
     "node_modules/@sentry/core": {
       "version": "5.30.0",
       "resolved": "https://registry.npmjs.org/@sentry/core/-/core-5.30.0.tgz",
@@ -1383,9 +1546,9 @@
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-      "resolved": "https://registry.npmjs.org/@solidity-parser/parser/-/parser-0.14.1.tgz",
-      "integrity": "sha512-eLjj2L6AuQjBB6s/ibwCAc0DwrR5Ge+ys+wgWo+bviU7fV2nTMQhU63CGaDKXg9iTmMxwhkyoggdIR7ZGRfMgw==",
+      "version": "0.14.3",
+      "resolved": "https://registry.npmjs.org/@solidity-parser/parser/-/parser-0.14.3.tgz",
+      "integrity": "sha512-29g2SZ29HtsqA58pLCtopI1P/cPy5/UAzlcAXO6T/CNJimG6yA8kx4NaseMyJULiC+TEs02Y9/yeHzClqoA0hw==",
       "dev": true,
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@@ -1433,6 +1596,15 @@
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       "dev": true
     },
+    "node_modules/@types/chai-as-promised": {
+      "version": "7.1.5",
+      "resolved": "https://registry.npmjs.org/@types/chai-as-promised/-/chai-as-promised-7.1.5.tgz",
+      "integrity": "sha512-jStwss93SITGBwt/niYrkf2C+/1KTeZCZl1LaeezTlqppAKeoQC7jxyqYuP72sxBGKCIbw7oHgbYssIRzT5FCQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/chai": "*"
+      }
+    },
     "node_modules/@types/json5": {
       "version": "0.0.29",
       "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
@@ -1870,6 +2042,15 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/ast-parents": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/ast-parents/-/ast-parents-0.0.1.tgz",
@@ -3143,6 +3324,48 @@
         "cborg": "cli.js"
       }
     },
+    "node_modules/chai": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.3.6.tgz",
+      "integrity": "sha512-bbcp3YfHCUzMOvKqsztczerVgBKSsEijCySNlHHbX3VG1nskvqjz5Rfso1gGwD6w6oOV3eI60pKuMOV5MV7p3Q==",
+      "dev": true,
+      "dependencies": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.2",
+        "deep-eql": "^3.0.1",
+        "get-func-name": "^2.0.0",
+        "loupe": "^2.3.1",
+        "pathval": "^1.1.1",
+        "type-detect": "^4.0.5"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/chai-as-promised": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/chai-as-promised/-/chai-as-promised-7.1.1.tgz",
+      "integrity": "sha512-azL6xMoi+uxu6z4rhWQ1jbdUhOMhis2PvscD/xjLqNMkv3BPPp2JyyuTHOrf9BOosGpNQ11v6BKv/g57RXbiaA==",
+      "dev": true,
+      "dependencies": {
+        "check-error": "^1.0.2"
+      },
+      "peerDependencies": {
+        "chai": ">= 2.1.2 < 5"
+      }
+    },
+    "node_modules/chai/node_modules/deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "dependencies": {
+        "type-detect": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
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@@ -3162,6 +3385,15 @@
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       "dev": true
     },
+    "node_modules/check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha512-BrgHpW9NURQgzoNyjfq0Wu6VFO6D7IZEmJNdtgNqpzGG8RuNFHt2jQxWlAs4HMe119chBnv+34syEZtc6IhLtA==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/checkpoint-store": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/checkpoint-store/-/checkpoint-store-1.1.0.tgz",
@@ -3878,6 +4110,18 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/deep-eql": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-4.1.0.tgz",
+      "integrity": "sha512-4YM7QHOMBoVWqGPnp3OPPK7+WCIhUR2OTpahlNQFiyTH3QEeiu9MtBiTAJBkfny4PNhpFbV/jm3lv0iCfb40MA==",
+      "dev": true,
+      "dependencies": {
+        "type-detect": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/deep-equal": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.1.1.tgz",
@@ -11439,6 +11683,15 @@
         "node": "6.* || 8.* || >= 10.*"
       }
     },
+    "node_modules/get-func-name": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
+      "integrity": "sha512-Hm0ixYtaSZ/V7C8FJrtZIuBBI+iSgL+1Aq82zSu8VQNB4S3Gk8e7Qs3VwBDJAhmRZcFqkl3tQu36g/Foh5I5ig==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/get-intrinsic": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
@@ -11586,15 +11839,6 @@
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@@ -11618,20 +11862,20 @@
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-      "resolved": "https://registry.npmjs.org/hardhat/-/hardhat-2.9.3.tgz",
-      "integrity": "sha512-7Vw99RbYbMZ15UzegOR/nqIYIqddZXvLwJGaX5sX4G5bydILnbjmDU6g3jMKJSiArEixS3vHAEaOs5CW1JQ3hg==",
+      "version": "2.10.2",
+      "resolved": "https://registry.npmjs.org/hardhat/-/hardhat-2.10.2.tgz",
+      "integrity": "sha512-L/KvDDT/MA6332uAtYTqdcHoSABljw4pPjHQe5SHdIJ+xKfaSc6vDKw03CmrQ5Xup0gHs8XnVSBpZo1AbbIW7g==",
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-        "@ethereumjs/blockchain": "^5.5.0",
-        "@ethereumjs/common": "^2.6.0",
-        "@ethereumjs/tx": "^3.4.0",
-        "@ethereumjs/vm": "^5.6.0",
+        "@ethereumjs/block": "^3.6.2",
+        "@ethereumjs/blockchain": "^5.5.2",
+        "@ethereumjs/common": "^2.6.4",
+        "@ethereumjs/tx": "^3.5.1",
+        "@ethereumjs/vm": "^5.9.0",
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         "@metamask/eth-sig-util": "^4.0.0",
         "@sentry/node": "^5.18.1",
-        "@solidity-parser/parser": "^0.14.1",
+        "@solidity-parser/parser": "^0.14.2",
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         "@types/lru-cache": "^5.1.0",
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@@ -11644,19 +11888,19 @@
         "debug": "^4.1.1",
         "enquirer": "^2.3.0",
         "env-paths": "^2.2.0",
-        "ethereum-cryptography": "^0.1.2",
+        "ethereum-cryptography": "^1.0.3",
         "ethereumjs-abi": "^0.6.8",
-        "ethereumjs-util": "^7.1.3",
+        "ethereumjs-util": "^7.1.4",
         "find-up": "^2.1.0",
         "fp-ts": "1.19.3",
         "fs-extra": "^7.0.1",
-        "glob": "^7.1.3",
+        "glob": "7.2.0",
         "immutable": "^4.0.0-rc.12",
         "io-ts": "1.10.4",
         "lodash": "^4.17.11",
-        "merkle-patricia-tree": "^4.2.2",
+        "merkle-patricia-tree": "^4.2.4",
         "mnemonist": "^0.38.0",
-        "mocha": "^9.2.0",
+        "mocha": "^10.0.0",
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@@ -11668,7 +11912,7 @@
         "stacktrace-parser": "^0.1.10",
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         "tsort": "0.0.1",
-        "undici": "^4.14.1",
+        "undici": "^5.4.0",
         "uuid": "^8.3.2",
         "ws": "^7.4.6"
       },
@@ -11676,7 +11920,19 @@
         "hardhat": "internal/cli/cli.js"
       },
       "engines": {
-        "node": "^12.0.0 || ^14.0.0 || ^16.0.0"
+        "node": "^14.0.0 || ^16.0.0 || ^18.0.0"
+      },
+      "peerDependencies": {
+        "ts-node": "*",
+        "typescript": "*"
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-      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.2.0.tgz",
-      "integrity": "sha512-Rsk5qQHJ9eowMH28Jwhe8HEbmdYDX4lwoMWshiCXugjtHqMD9ZbiqSDLxcsfdqsETPzVUtX5s1Z5kStiIM6l4A==",
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.2.1.tgz",
+      "integrity": "sha512-ILEIE97kDZvF9Wb9f6h5aXK4swSlKGUcOEGiIYb2OOu/IrDU9iwj0fD//SsA6E5ibwJxpEvhullJY4Sl4GcpAw==",
       "dev": true
     },
     "wrap-ansi": {
diff --git a/package.json b/package.json
index b06b2ea..a3c4692 100644
--- a/package.json
+++ b/package.json
@@ -39,11 +39,13 @@
   },
   "homepage": "https://github.com/67P/kredits-contracts#readme",
   "devDependencies": {
+    "@nomicfoundation/hardhat-chai-matchers": "^1.0.3",
     "@nomiclabs/hardhat-ethers": "^2.0.2",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@openzeppelin/contracts-upgradeable": "^4.3.2",
     "@openzeppelin/hardhat-upgrades": "^1.10.0",
     "async-each-series": "^1.1.0",
+    "chai": "^4.3.6",
     "cli-table": "^0.3.1",
     "colors": "^1.0.3",
     "eslint": "^8.14.0",
@@ -57,6 +59,7 @@
     "hardhat-deploy": "^0.11.4",
     "hardhat-deploy-ethers": "^0.3.0-beta.10",
     "homedir": "^0.6.0",
+    "mocha": "^10.0.0",
     "promptly": "^3.0.3",
     "solhint": "^3.3.7",
     "truffle-hdwallet-provider": "^1.0.17",
diff --git a/test/Contribution.js b/test/Contribution.js
new file mode 100644
index 0000000..ef874ca
--- /dev/null
+++ b/test/Contribution.js
@@ -0,0 +1,19 @@
+const { expect } = require("chai");
+const { ethers, upgrades } = require("hardhat");
+let hardhatContribution;
+
+describe("Contribution contract", function () {
+
+  describe("Deployment", function () {
+    before(async function () {
+      // const [owner] = await ethers.getSigners();
+      const Contribution = await ethers.getContractFactory("Contribution");
+      hardhatContribution = await upgrades.deployProxy(Contribution, [40321]);
+    });
+
+    it("sets the veto confirmation period", async function () {
+      expect(await hardhatContribution.blocksToWait()).to.equal(40321);
+    });
+  });
+
+});