chore: fix codecov coverage submitting

The ruby uploader has been deprecated long ago. Instead, we generate an
XML report and use the newer GitHub action to upload the report to
codecov. The required secrets have already been added to the repository.

Author: jgraichen

.github/workflows/test.yml

@@ -31,7 +31,13 @@ jobs:
           BUNDLE_JOBS: 4
           BUNDLE_RETRY: 3
 
-      - run: bundle exec rspec --color --format documentation
+      - run: |
+          bundle exec rspec --color --format documentation
+
+      - uses: codecov/codecov-action@v4
+        with:
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   rubocop:
     name: rubocop

Gemfile

@@ -10,8 +10,8 @@ gem 'rake-release'
 gem 'typhoeus'
 
 group :test do
-  gem 'codecov', require: false
-  gem 'simplecov', require: false
+  gem 'simplecov'
+  gem 'simplecov-cobertura'
 
   gem 'puma'
   gem 'rspec', '~> 3.0'

spec/spec_helper.rb

@@ -4,14 +4,16 @@
 require 'rspec/collection_matchers'
 
 require 'simplecov'
+require 'simplecov-cobertura'
+
 SimpleCov.start do
   add_filter 'spec'
 end
 
-if ENV['CI']
-  require 'codecov'
-  SimpleCov.formatter = SimpleCov::Formatter::Codecov
-end
+SimpleCov.formatters = [
+  SimpleCov::Formatter::HTMLFormatter,
+  SimpleCov::Formatter::CoberturaFormatter,
+]
 
 require 'restify'