Code coverage (#10)

Author: marcqualie

.circleci/config.yml

@@ -7,5 +7,19 @@ jobs:
     steps:
       - checkout
       - run: bundle install
-      - run: bundle exec rake test
-      - run: bundle exec rubocop
+      - run:
+          name: Setup Code Climate test-reporter
+          command: |
+            # download test reporter as a static binary
+            curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+            chmod +x ./cc-test-reporter
+      - run:
+          name: rake test
+          command: |
+            ./cc-test-reporter before-build
+            bundle exec rake test
+            ./cc-test-reporter after-build --coverage-input-type lcov --exit-code $?
+      - run:
+          name: rubocop
+          command: bundle exec rubocop
+          when: always

.rubocop.yml

@@ -9,6 +9,8 @@ Style/Documentation:
 Metrics/MethodLength:
   Exclude:
     - test/**/*_test.rb
+TrailingCommaInArrayLiteral:
+  EnforcedStyleForMultiline: consistent_comma
 Style/TrailingCommaInArguments:
   EnforcedStyleForMultiline: consistent_comma
 Style/AccessorGrouping:

Gemfile

@@ -8,3 +8,5 @@ gemspec
 gem 'minitest', '~> 5.0'
 gem 'rake', '~> 13.0'
 gem 'rubocop', '~> 0.88.0'
+gem 'simplecov', '~> 0.17.0', require: false # CodeClimate not compatible with 0.18+ yet - https://github.com/codeclimate/test-reporter/issues/413
+gem 'simplecov-lcov', '< 0.8'

test/test_helper.rb

@@ -1,5 +1,19 @@
 # frozen_string_literal: true
 
+require 'simplecov'
+require 'simplecov-lcov'
+SimpleCov::Formatter::LcovFormatter.config.report_with_single_file = true
+SimpleCov::Formatter::LcovFormatter.config do |c|
+  c.single_report_path = 'coverage/lcov.info'
+end
+SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(
+  [
+    SimpleCov::Formatter::HTMLFormatter,
+    SimpleCov::Formatter::LcovFormatter,
+  ],
+)
+SimpleCov.start
+
 $LOAD_PATH.unshift File.expand_path('../lib', __dir__)
 require 'diffcrypt'