fix: coveralls test coverage reporting to use GitHub Actions

.github/workflows/main.yml

@@ -27,3 +27,8 @@ jobs:
 
       - name: Ruby tests
         run: bundle exec rspec
+
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

Gemfile

@@ -5,7 +5,7 @@ gemspec
 
 group :test do
   gem 'simplecov'
-  gem 'coveralls', require: false
+  gem 'simplecov-lcov'
   gem 'rspec'
 end
 

spec/support/coverage.rb

@@ -1,16 +1,16 @@
-begin
+require 'simplecov'
+
+SimpleCov.start 'rails' do
   if ENV['CI']
-    require 'coveralls'
-    Coveralls.wear!
-  elsif ENV['COVERAGE']
-    require 'simplecov'
-  end
+    require 'simplecov-lcov'
 
-  if ENV['CI'] || ENV['COVERAGE']
-    SimpleCov.start do
-      add_filter '/spec/'
+    SimpleCov::Formatter::LcovFormatter.config do |c|
+      c.report_with_single_file = true
+      c.single_report_path = 'coverage/lcov.info'
     end
+
+    formatter SimpleCov::Formatter::LcovFormatter
   end
-rescue LoadError => e
-  warn(e)
+
+  add_filter %w[version.rb initializer.rb]
 end