Setup rubocop

.github/workflows/ci.yml

@@ -11,6 +11,18 @@ on:
 env:
   RSPEC_CI: true
 jobs:
+  rubocop:
+    name: Rubocop
+    runs-on: 'ubuntu-20.04'
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+      - run: script/update_rubygems_and_install_bundler
+      - run: bundle install
+      - run: bundle exec rubocop -c .rubocop.yml
+
   test:
     name: Ruby ${{ matrix.ruby }} ${{ matrix.name_extra || '' }}
     runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
@@ -51,5 +63,6 @@ jobs:
           bundler: ${{ matrix.bundler || 2 }}
           ruby-version: ${{ matrix.ruby }}
       - run: script/update_rubygems_and_install_bundler
-      - run: bundle install --binstubs --standalone
+      - run: bundle install --standalone
+      - run: bundle binstubs --all
       - run: script/test_all

.rubocop.yml

@@ -0,0 +1,46 @@
+AllCops:
+  NewCops: enable
+  SuggestExtensions: false
+
+Metrics/BlockLength:
+  Enabled: true
+  Exclude:
+    - spec/**/*_spec.rb
+
+Layout/LineLength:
+  Max: 120
+
+Lint/NestedMethodDefinition:
+  Exclude:
+    - lib/rspec/its.rb
+
+Lint/SendWithMixinArgument:
+  Exclude:
+    - lib/rspec/its.rb
+
+Metrics/AbcSize:
+  Exclude:
+    - lib/rspec/its.rb
+
+Metrics/MethodLength:
+  Max: 25
+
+Naming/PredicateName:
+  Exclude:
+    - lib/rspec/its.rb
+
+Style/CaseEquality:
+  Exclude:
+    - lib/rspec/its/subject.rb
+
+Style/SignalException:
+  Exclude:
+    - features/**/*.rb
+
+Style/SpecialGlobalVars:
+  Exclude:
+    - rspec-its.gemspec
+
+# We don't care about single vs double quotes.
+Style/StringLiterals:
+  Enabled: false

Gemfile

@@ -24,3 +24,4 @@ gem 'cucumber', '>= 1.3.8'
 gem 'ffi', '~> 1.17.0'
 gem 'matrix', '~> 0.4.2'
 gem 'rake', '~> 13.2.0'
+gem 'rubocop', '~> 1.68.0'