Added simplecov, codecov, and simplecov-console as new deps

Require codecov and simplecov before loading test/lib code

This will be needed to report data to CodeCov and to the console

Start running test suite with GitHub actions

Set env variable to always check COVERAGE in CI (GitHub Actions)

Move env definition to a higher level

Add CODECOV_TOKEN

.github/workflows/test.yml

@@ -0,0 +1,89 @@
+# .github/workflows/ci.yml
+
+name: Test
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+env:
+  COVERAGE: true
+  CODECOV_TOKEN: d7028c0e-97c5-485f-85e5-f63daabeef63
+jobs:
+  test-ruby-2-4-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.4
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-2-5-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.5
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-2-6-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-2-7-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test
+  test-ruby-3-0-x:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.0
+          bundler-cache: true
+      - name: Build and run tests
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+          bundle exec rake test

rails_stats.gemspec

@@ -21,6 +21,9 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rake"
   spec.add_development_dependency "bundler", ">= 1.6", "< 3.0"
   spec.add_development_dependency "byebug"
+  spec.add_development_dependency "codecov"
   spec.add_development_dependency "minitest"
   spec.add_development_dependency "minitest-around"
+  spec.add_development_dependency "simplecov"
+  spec.add_development_dependency "simplecov-console"
 end

test/test_helper.rb

@@ -1,5 +1,23 @@
 # frozen_string_literal: true
 
+if ENV["COVERAGE"] == "true"
+  require "simplecov"
+  require "simplecov-console"
+  require "codecov"
+
+  SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
+    SimpleCov::Formatter::HTMLFormatter,
+    SimpleCov::Formatter::Console,
+    SimpleCov::Formatter::Codecov,
+  ]
+
+  SimpleCov.start do
+    track_files "lib/**/*.rb"
+  end
+
+  puts "Using SimpleCov v#{SimpleCov::VERSION}"
+end
+
 require "byebug"
 
 require "minitest/autorun"