Add an RSpec 4 pre-release CI job

.github/workflows/main.yml

@@ -32,24 +32,53 @@ jobs:
         task:
           - internal_investigation
           - spec
-        rubocop_version:
-          - gem
-        include:
-          - rubocop_version: edge
-            ruby: 2.7
-            task: internal_investigation
-          - rubocop_version: edge
-            ruby: 2.7
-            task: spec
-    name: ${{ matrix.task }}, Ruby ${{ matrix.ruby }} (${{ matrix.rubocop_version }})
+    name: ${{ matrix.task }}, Ruby ${{ matrix.ruby }} (gem)
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "${{ matrix.ruby }}"
+          bundler-cache: true
+      - run: bundle exec rake ${{ matrix.task }}
+
+  edge-rubocop:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby:
+          - 2.7
+        task:
+          - internal_investigation
+          - spec
+    name: ${{ matrix.task }} Ruby ${{ matrix.ruby }} (edge)
     steps:
       - uses: actions/checkout@v2
       - name: Use latest RuboCop from `master`
         run: |
           echo "gem 'rubocop', github: 'rubocop-hq/rubocop'" > Gemfile.local
-        if: matrix.rubocop_version == 'edge'
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "${{ matrix.ruby }}"
           bundler-cache: true
       - run: bundle exec rake ${{ matrix.task }}
+
+  rspec4:
+    runs-on: ubuntu-latest
+    name: RSpec 4
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use latest RSpec 4 from `4-0-dev` branch
+        run: |
+          sed -e '/rspec/d' -i Gemfile
+          cat << EOF > Gemfile.local
+            gem 'rspec', github: 'rspec/rspec', branch: '4-0-dev'
+            gem 'rspec-core', github: 'rspec/rspec-core', branch: '4-0-dev'
+            gem 'rspec-expectations', github: 'rspec/rspec-expectations', branch: '4-0-dev'
+            gem 'rspec-mocks', github: 'rspec/rspec-mocks', branch: '4-0-dev'
+            gem 'rspec-support', github: 'rspec/rspec-support', branch: '4-0-dev'
+          EOF
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+          bundler-cache: true
+      - run: bundle exec rake spec

.rspec

@@ -1,3 +1,2 @@
 --require spec_helper
---color
 --format documentation

Gemfile

@@ -4,6 +4,13 @@ source 'https://rubygems.org'
 
 gemspec
 
+gem 'rack'
+gem 'rake'
+gem 'rspec', '~> 3.11'
+gem 'rubocop-performance', '~> 1.7'
+gem 'rubocop-rake', '~> 0.6'
+gem 'yard'
+
 local_gemfile = 'Gemfile.local'
 
 if File.exist?(local_gemfile)

rubocop-rspec.gemspec

@@ -38,11 +38,4 @@ Gem::Specification.new do |spec|
   }
 
   spec.add_runtime_dependency 'rubocop', '~> 1.31'
-
-  spec.add_development_dependency 'rack'
-  spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'rspec', '>= 3.4'
-  spec.add_development_dependency 'rubocop-performance', '~> 1.7'
-  spec.add_development_dependency 'rubocop-rake', '~> 0.6'
-  spec.add_development_dependency 'yard'
 end

spec/rubocop/cli/autocorrect_spec.rb

@@ -1,8 +1,10 @@
 # frozen_string_literal: true
 
-RSpec.describe 'RuboCop::CLI --autocorrect', :isolated_environment do # rubocop:disable RSpec/DescribeClass
+RSpec.describe 'RuboCop::CLI --autocorrect' do # rubocop:disable RSpec/DescribeClass
   subject(:cli) { RuboCop::CLI.new }
 
+  include_context 'isolated environment'
+
   include_context 'when cli spec behavior'
 
   context 'when corrects `RSpec/Capybara/CurrentPathExpectation` with ' \

spec/smoke_tests/weird_rspec_spec.rb

@@ -86,7 +86,7 @@
   end
 
   it_behaves_like :something
-  it_should_behave_like :something
+  it_should_behave_like :something if RSpec::Core::Version::STRING < '4.0'
 
   it_behaves_like :something do
     let(:foo) { 'bar' }

spec/spec_helper.rb

@@ -24,11 +24,7 @@ module SpecHelper
   config.order = :random
 
   # Run focused tests with `fdescribe`, `fit`, `:focus` etc.
-  config.filter_run focus: true
-  config.run_all_when_everything_filtered = true
-
-  # Forbid RSpec from monkey patching any of our objects
-  config.disable_monkey_patching!
+  config.filter_run_when_matching :focus
 
   # We should address configuration warnings when we upgrade
   config.raise_errors_for_deprecations!
@@ -38,6 +34,10 @@ module SpecHelper
   config.raise_on_warning = true
 
   config.include(ExpectOffense)
+
+  config.include_context 'with default RSpec/Language config', :config
+  config.include_context 'config', :config
+  config.include_context 'smoke test', type: :cop_spec
 end
 
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))