Added Rubocop.

.rubocop.yml

@@ -0,0 +1,52 @@
+require:
+  - rubocop-performance
+  # - rubocop-rspec
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Style/SymbolArray:
+  Enabled: false
+
+Style/WordArray:
+  Enabled: false
+
+# RSpec/DescribedClass:
+#   Enabled: false
+
+# TODO: Fix these...
+Style/Documentation:
+  Enabled: false
+
+Style/GuardClause:
+  Enabled: false
+
+Style/ConditionalAssignment:
+  Enabled: false
+
+Style/ClassAndModuleChildren:
+  Enabled: false
+
+Lint/AssignmentInCondition:
+  Enabled: false
+
+Metrics/ModuleLength:
+  Enabled: false
+
+Layout/LineLength:
+  Enabled: false
+
+Metrics:
+  Enabled: false
+
+Naming/PredicateName:
+  Enabled: false
+
+Naming/AccessorMethodName:
+  Enabled: false
+
+Performance/TimesMap:
+  Enabled: false
+
+# RSpec/BeforeAfterAll:
+#   Enabled: false

Rakefile

@@ -0,0 +1,15 @@
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
+require 'rubocop/rake_task'
+
+desc('Codestyle check and linter')
+RuboCop::RakeTask.new('rubocop') do |task|
+  task.fail_on_error = true
+  task.patterns = [
+    'lib/**/*.rb',
+    'spec/**/*.rb'
+  ]
+end
+
+RSpec::Core::RakeTask.new(spec: ['rubocop'])
+task(default: :spec)

spec/spec_helper.rb

@@ -12,3 +12,13 @@ require 'byebug'
 
 Dir[File.dirname(__FILE__) + '/shared/contexts/*.rb'].each {|file| require file }
 Dir[File.dirname(__FILE__) + '/shared/examples/*.rb'].each {|file| require file }
+
+RSpec.configure do |config|
+  config.mock_with :rspec
+  config.filter_run_when_matching :focus
+  config.disable_monkey_patching!
+
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+end