Add CodeCov for Ruby coverage reports (#23868)

.github/workflows/test-ruby.yml

@@ -94,7 +94,7 @@ jobs:
       DB_HOST: localhost
       DB_USER: postgres
       DB_PASS: postgres
-      DISABLE_SIMPLECOV: true
+      DISABLE_SIMPLECOV: ${{ matrix.ruby-version != '.ruby-version' }}
       RAILS_ENV: test
       ALLOW_NOPAM: true
       PAM_ENABLED: true
@@ -137,6 +137,12 @@ jobs:
 
       - run: bin/rspec
 
+      - name: Upload coverage reports to Codecov
+        if: matrix.ruby-version == '.ruby-version'
+        uses: codecov/codecov-action@v3
+        with:
+          files: coverage/lcov/mastodon.lcov
+
   test-e2e:
     name: End to End testing
     runs-on: ubuntu-latest

Gemfile

@@ -139,6 +139,7 @@ group :test do
 
   # Coverage formatter for RSpec test if DISABLE_SIMPLECOV is false
   gem 'simplecov', '~> 0.22', require: false
+  gem 'simplecov-lcov', '~> 0.8', require: false
 
   # Stub web requests for specs
   gem 'webmock', '~> 3.18'

Gemfile.lock

@@ -725,6 +725,7 @@ GEM
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
+    simplecov-lcov (0.8.0)
     simplecov_json_formatter (0.1.4)
     smart_properties (1.17.0)
     sprockets (3.7.2)
@@ -936,6 +937,7 @@ DEPENDENCIES
   simple-navigation (~> 4.4)
   simple_form (~> 5.2)
   simplecov (~> 0.22)
+  simplecov-lcov (~> 0.8)
   sprockets (~> 3.7.2)
   sprockets-rails (~> 3.4)
   stackprof

spec/spec_helper.rb

@@ -2,13 +2,21 @@
 
 if ENV['DISABLE_SIMPLECOV'] != 'true'
   require 'simplecov'
+  require 'simplecov-lcov'
+  SimpleCov::Formatter::LcovFormatter.config.report_with_single_file = true
+  SimpleCov.formatter = SimpleCov::Formatter::LcovFormatter
   SimpleCov.start 'rails' do
+    enable_coverage :branch
+    enable_coverage_for_eval
+
     add_filter 'lib/linter'
     add_group 'Policies', 'app/policies'
     add_group 'Presenters', 'app/presenters'
     add_group 'Serializers', 'app/serializers'
     add_group 'Services', 'app/services'
     add_group 'Validators', 'app/validators'
+
+    add_group 'Libraries', 'lib'
   end
 end