Merge pull request #83 from rubocop/ci-test-ruby-4.0

CI: Test with Ruby 4.0

Author: ydah

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
       - run: bundle exec rake confirm_config documentation_syntax_check confirm_documentation
 
@@ -33,6 +33,7 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
+          - "4.0"
           - ruby-head
           - jruby-9.4
         task:
@@ -54,7 +55,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
       - run: bundle exec rake spec
 
@@ -73,7 +74,7 @@ jobs:
           echo "gem 'rubocop', github: 'rubocop/rubocop'" > Gemfile.local
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
       - run: NO_COVERAGE=true bundle exec rake ${{ matrix.task }}
 
@@ -93,7 +94,7 @@ jobs:
           echo "gem 'rubocop-rspec', github: 'rubocop/rubocop-rspec'" > Gemfile.local
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
       - run: NO_COVERAGE=true bundle exec rake ${{ matrix.task }}
 
@@ -114,6 +115,6 @@ jobs:
           EOF
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
       - run: NO_COVERAGE=true bundle exec rake spec

Gemfile

@@ -5,6 +5,7 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'bump'
+gem 'irb' # undeclared dependency of yard
 gem 'rack'
 gem 'rake'
 gem 'rspec', '~> 3.11'