Update CI and add more Rubies to test

* add simplecov JSON and lcov reporting
* add all ruby Ruby versions for testing, up to the current release
  - 2.7
  - 3.0
  - 3.1
  - 3.2
  - 3.3
  - 3.4
* switch ubuntu and macos to latest versions
* remove ruby version specification from the `coverge` step, because it
  should use the default/minimum Ruby specified in the `.ruby-version`
* remove the bundler version specification
* update action/checkout step to v4

.github/workflows/ci.yml

@@ -8,32 +8,25 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-13]
-        ruby: [2.6, head, jruby, jruby-head]
+        os: [ubuntu-latest, macos-latest]
+        ruby: [2.6, 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, head, jruby, jruby-head]
     continue-on-error: ${{ endsWith(matrix.ruby, 'head') || endsWith(matrix.ruby, 'jruby') }}
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
-        # HACK: Continue to use bundler <2 because of Ruby v2.2 support. Once the
-        # lowest dependency is Ruby v2.3 we can consider upgrading to Bundler 2.x.
-        bundler: 2.1
         bundler-cache: true
     - run: bundle exec rake spec
   coverage:
     needs: [ test ]
     name: coverage
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6
-        # HACK: Continue to use bundler <2 because of Ruby v2.2 support. Once the
-        # lowest dependency is Ruby v2.3 we can consider upgrading to Bundler 2.x.
-        bundler: 2.1
         bundler-cache: true
     - run: bundle exec rake
       env:

rspec-side_effects.gemspec

@@ -40,6 +40,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '~> 0.68.0'
   spec.add_development_dependency 'rubocop-rspec'
   spec.add_development_dependency 'simplecov'
+  spec.add_development_dependency 'simplecov-lcov'
   spec.add_development_dependency 'yard'
   spec.add_development_dependency 'yardstick'
 end

spec/spec_helper.rb

@@ -4,7 +4,21 @@
 
 # Setup code coverage
 require 'simplecov'
-SimpleCov.start
+require 'simplecov-lcov'
+require 'simplecov_json_formatter'
+SimpleCov.start do
+  # NOTE: Include the lcov formatter for CodeClimate reporting.
+  # Even though the simplecov JSON format will be output and used by default,
+  # the test reporter does not handle it reliable.
+  # Using the lcov formatter is more reliable.
+  SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(
+    [
+      SimpleCov::Formatter::HTMLFormatter,
+      SimpleCov::Formatter::JSONFormatter,
+      SimpleCov::Formatter::LcovFormatter
+    ]
+  )
+end
 
 require 'rspec/side_effects'