Add code coverage check

Author: vertism

.github/workflows/test.yml

@@ -67,6 +67,12 @@ jobs:
       - name: Run linters and tests
         run: bundle exec rake
 
+      - name: Code coverage
+        uses: joshmfrankel/simplecov-check-action@main
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          minimum_suite_coverage: 96
+
   call-build-and-deploy:
     if: ${{ github.ref == 'refs/heads/main' }}
     needs: test

Gemfile

@@ -48,5 +48,5 @@ group :test do
   gem "rubocop-govuk", require: false
   gem "selenium-webdriver"
   gem "simplecov", require: false
-  gem "simplecov-rcov"
+  gem "simplecov-json", require: false
 end

Gemfile.lock

@@ -375,8 +375,9 @@ GEM
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
-    simplecov-rcov (0.3.1)
-      simplecov (>= 0.4.1)
+    simplecov-json (0.2.3)
+      json
+      simplecov
     simplecov_json_formatter (0.1.4)
     smart_properties (1.17.0)
     sprockets (3.7.2)
@@ -451,7 +452,7 @@ DEPENDENCIES
   sentry-rails
   sentry-ruby
   simplecov
-  simplecov-rcov
+  simplecov-json
   uglifier
   virtus
 

spec/spec_helper.rb

@@ -1,13 +1,13 @@
 ENV["RAILS_ENV"] ||= "test"
 
 require "simplecov"
-SimpleCov.minimum_coverage 100
-
-SimpleCov.start do
-  add_filter "spec/support"
-  add_filter "spec/rails_helper.rb"
-  add_filter "config/initializers"
-  add_filter "config/routes.rb"
+require "simplecov-json"
+SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new([
+  SimpleCov::Formatter::HTMLFormatter,
+  SimpleCov::Formatter::JSONFormatter,
+])
+SimpleCov.start "rails" do
+  add_filter %r{^/lib/}
 end
 
 Dir["./spec/support/**/*.rb"].each { |f| require f }