diff --git a/.gitignore b/.gitignore
index 9106b2a..f469582 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 /pkg/
 /spec/reports/
 /tmp/
+.rspec_status
diff --git a/Gemfile.lock b/Gemfile.lock
index 617e9f0..1139bb8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,6 +15,7 @@ GEM
     coderay (1.1.2)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
+    diff-lcs (1.3)
     faraday (0.15.2)
       multipart-post (>= 1.2, < 3)
     faraday_middleware (0.12.2)
@@ -31,9 +32,10 @@ GEM
       shellany (~> 0.0)
       thor (>= 0.18.1)
     guard-compat (1.2.1)
-    guard-minitest (2.4.6)
-      guard-compat (~> 1.2)
-      minitest (>= 3.0)
+    guard-rspec (4.7.3)
+      guard (~> 2.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
     hashdiff (0.3.7)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -42,7 +44,6 @@ GEM
     lumberjack (1.0.13)
     method_source (0.9.0)
     mini_portile2 (2.3.0)
-    minitest (5.11.3)
     multipart-post (2.0.0)
     nenv (0.3.0)
     nitlink (1.1.0)
@@ -55,12 +56,23 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
-    purdytest (2.0.0)
-      minitest (~> 5.5)
     rake (10.5.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
     shellany (0.0.1)
@@ -76,12 +88,11 @@ PLATFORMS
 DEPENDENCIES
   bundler (~> 1.16)
   guard (~> 2.14.2)
-  guard-minitest (~> 2.4.6)
+  guard-rspec (~> 4.7.3)
   manifique!
-  minitest (~> 5.0)
   pry (~> 0.11.3)
-  purdytest (~> 2.0)
   rake (~> 10.0)
+  rspec (~> 3.0)
   webmock (~> 3.4.2)
 
 BUNDLED WITH
diff --git a/Guardfile b/Guardfile
index a5001e2..cd0c6fd 100644
--- a/Guardfile
+++ b/Guardfile
@@ -1,5 +1,5 @@
-guard :minitest do
-  watch(%r{^test/(.*)\/?(.*)_test\.rb$})
-  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}#{m[2]}_test.rb" }
-  watch(%r{^test/test_helper\.rb$})      { 'test' }
+guard :rspec, cmd: 'rspec' do
+  watch(%r{^spec/.+_spec\.rb$})
+  watch(%r{^lib/manifique/(.+)\.rb$})     { |m| "spec/manifique/#{m[1]}_spec.rb" }
+  watch('spec/spec_helper.rb')  { "spec" }
 end
diff --git a/Rakefile b/Rakefile
index d433a1e..b7e9ed5 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,10 +1,6 @@
 require "bundler/gem_tasks"
-require "rake/testtask"
+require "rspec/core/rake_task"
 
-Rake::TestTask.new(:test) do |t|
-  t.libs << "test"
-  t.libs << "lib"
-  t.test_files = FileList["test/**/*_test.rb"]
-end
+RSpec::Core::RakeTask.new(:spec)
 
-task :default => :test
+task :default => :spec
diff --git a/lib/manifique/web_client.rb b/lib/manifique/web_client.rb
index 178ffc3..8a0ffed 100644
--- a/lib/manifique/web_client.rb
+++ b/lib/manifique/web_client.rb
@@ -7,7 +7,7 @@ require 'pry'
 
 module Manifique
   class WebClient
-    def initialize(options)
+    def initialize(options={})
       @options = options
       @url = options[:url]
     end
diff --git a/manifique.gemspec b/manifique.gemspec
index a97d187..2bec6b3 100644
--- a/manifique.gemspec
+++ b/manifique.gemspec
@@ -24,12 +24,11 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "bundler", "~> 1.16"
   spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "minitest", "~> 5.0"
-  spec.add_development_dependency "purdytest", "~> 2.0"
+  spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "webmock", "~> 3.4.2"
   spec.add_development_dependency "pry", "~> 0.11.3"
   spec.add_development_dependency "guard", "~> 2.14.2"
-  spec.add_development_dependency "guard-minitest", "~> 2.4.6"
+  spec.add_development_dependency "guard-rspec", "~> 4.7.3"
 
   spec.add_runtime_dependency "faraday", "~> 0.15.2"
   spec.add_runtime_dependency "faraday_middleware", "~> 0.12.2"
diff --git a/spec/manifique/agent_spec.rb b/spec/manifique/agent_spec.rb
new file mode 100644
index 0000000..f217004
--- /dev/null
+++ b/spec/manifique/agent_spec.rb
@@ -0,0 +1,22 @@
+require "spec_helper"
+
+RSpec.describe Manifique::Agent do
+  describe "options" do
+    describe "URL validation" do
+      context "with invalid URL" do
+        it "raises an exception" do
+          expect { Manifique::Agent.new }.to raise_error
+          expect { Manifique::Agent.new(url: "htp://example.com") }.to raise_error
+        end
+      end
+
+      context "with valid URL" do
+        subject { Manifique::Agent.new(url: "https://example.com") }
+
+        it "creates the instance" do
+          expect(subject.class).to eq(Manifique::Agent)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/manifique/web_client_spec.rb b/spec/manifique/web_client_spec.rb
new file mode 100644
index 0000000..3ffd8fe
--- /dev/null
+++ b/spec/manifique/web_client_spec.rb
@@ -0,0 +1,54 @@
+require "spec_helper"
+require "manifique/web_client"
+
+RSpec.describe Manifique::WebClient do
+  before do
+    stub_request(:get, "http://example.com/404").
+      to_return(body: "", status: 404, headers: {})
+
+    stub_request(:get, "http://example.com/500").
+      to_return(body: "", status: 500, headers: {})
+  end
+
+  describe "#do_get_request" do
+    context "unsuccessful requests" do
+      describe "404" do
+        let(:client) { Manifique::WebClient.new }
+
+        it "raises an exception" do
+          expect {
+            client.send(:do_get_request, 'http://example.com/404')
+          }.to raise_error("Could not fetch http://example.com/404 successfully (404)")
+        end
+      end
+
+      describe "500" do
+        let(:client) { Manifique::WebClient.new }
+
+        it "raises an exception" do
+          expect {
+            client.send(:do_get_request, 'http://example.com/500')
+          }.to raise_error("Could not fetch http://example.com/500 successfully (500)")
+        end
+      end
+    end
+  end
+
+  # describe "HTTP requests" do
+  #   let(:connection) do
+  #     Faraday.new do |builder|
+  #       builder.adapter :test do |stub|
+  #         stub.get('/api/v2/cake') { |env| [ 200, {}, env.params.to_json ]}
+  #         stub.post('/api/v2/pizza/body') { |env| [ 200, {}, env.body ]}
+  #         stub.post('/api/v2/pizza/query') { |env| [ 200, {}, env.params.to_json ]}
+  #         stub.delete('/api/v2/gluhwein') { |env| [ 200, {}, 'delete' ]}
+  #       end
+  #     end
+  #   end
+  #
+  #   it "requests via get" do
+  #     expect(subject).to receive(:connection).and_return(connection)
+  #     expect(subject.get('/cake', {query: 'coffee'}).body).to eql('{"query":"coffee"}')
+  #   end
+  # end
+end
diff --git a/spec/manifique_spec.rb b/spec/manifique_spec.rb
new file mode 100644
index 0000000..b9fcd7a
--- /dev/null
+++ b/spec/manifique_spec.rb
@@ -0,0 +1,8 @@
+require "spec_helper"
+
+RSpec.describe Manifique do
+  it "has a version number" do
+    expect(Manifique::VERSION).not_to be nil
+  end
+
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..86f61e1
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,18 @@
+require "bundler/setup"
+require "manifique"
+require 'webmock/rspec'
+
+Dir[File.join(File.expand_path(File.dirname(__FILE__)), 'support/*.rb')].each {|f| require f }
+RSpec.configure do |config|
+  # Enable flags like --only-failures and --next-failure
+  config.example_status_persistence_file_path = ".rspec_status"
+
+  # Disable RSpec exposing methods globally on `Module` and `main`
+  config.disable_monkey_patching!
+
+  config.include ManifiqueFixtures
+
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+end
diff --git a/spec/support/fixtures.rb b/spec/support/fixtures.rb
new file mode 100644
index 0000000..48da6e9
--- /dev/null
+++ b/spec/support/fixtures.rb
@@ -0,0 +1,28 @@
+module ManifiqueFixtures
+
+  def mock_connection(urls={})
+    Faraday.new do |builder|
+      builder.response :json, :content_type => /\bjson$/
+      builder.adapter :test do |stub|
+        urls.each do |http_method, requests|
+          requests.each do |url, fixture|
+            stub.send(http_method, url) { |env| [ 200, {'Content-Type' => 'application/json'}, manifique_fixture(fixture) ]}
+          end
+        end
+        yield stub if block_given?
+      end
+    end
+  end
+
+  # returns the content of a fixture file (fixtures/file.json)
+  # if no file is found it will just return the provided param...
+  # (assuming we then don't care about real bitgo contents but just check for a response vale)
+  def manifique_fixture(file)
+    path = File.join(File.expand_path(File.dirname(__FILE__)), '../fixtures', "#{file}.json")
+    if File.exists?(path)
+      File.read(path)
+    else
+      file.to_json # returning the provided param - asuming we don't care about real bitgo values and just check for a response
+    end
+  end
+end
diff --git a/test/manifique_test.rb b/test/manifique_test.rb
deleted file mode 100644
index ada2d34..0000000
--- a/test/manifique_test.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-require "test_helper"
-
-class ManifiqueTest < Minitest::Test
-
-  def test_that_it_has_a_version_number
-    refute_nil ::Manifique::VERSION
-  end
-
-  def test_init_without_url
-    assert_raises(RuntimeError) { Manifique::Agent.new }
-  end
-
-  def test_init_with_invalid_url
-    assert_raises(RuntimeError) { Manifique::Agent.new(url: "htp:/foo.com") }
-  end
-
-  def test_fetch_metadata_request_404
-    stub_request(:get, "http://example.com/404").
-      to_return(body: "", status: 404, headers: {})
-
-    agent = Manifique::Agent.new(url: 'http://example.com/404')
-    assert_raises(RuntimeError) { agent.fetch_metadata }
-  end
-
-  def test_fetch_metadata_request_500
-    stub_request(:get, "http://example.com/500").
-      to_return(body: "", status: 500, headers: {})
-
-    agent = Manifique::Agent.new(url: 'http://example.com/500')
-    assert_raises(RuntimeError) { agent.fetch_metadata }
-  end
-end
diff --git a/test/test_helper.rb b/test/test_helper.rb
deleted file mode 100644
index 174cff0..0000000
--- a/test/test_helper.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-$LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
-require "manifique"
-
-require "minitest/autorun"
-require "purdytest"
-require "webmock/minitest"