Enable shared example empty line around blocks checking

- we should better enforce line breaks around shared example
  blocks

.rubocop_todo.yml

@@ -208,6 +208,17 @@ Naming/RescuedExceptionsVariableName:
 RSpec/ContextWording:
   Enabled: false
 
+RSpec/EmptyLineAfterSharedExample:
+  Exclude:
+    - 'ee/spec/mailers/notify_spec.rb'
+    - 'ee/spec/services/quick_actions/interpret_service_spec.rb'
+    - 'spec/controllers/repositories/git_http_controller_spec.rb'
+    - 'spec/finders/projects/serverless/functions_finder_spec.rb'
+    - 'spec/lib/gitlab/hook_data/issuable_builder_spec.rb'
+    - 'spec/lib/gitlab/legacy_github_import/importer_spec.rb'
+    - 'spec/models/event_spec.rb'
+    - 'spec/support/shared_examples/models/issuable_hook_data_shared_examples.rb'
+
 # Offense count: 879
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.

rubocop/cop/rspec/empty_line_after_shared_example.rb

+# frozen_string_literal: true
+
+require 'rubocop/rspec/final_end_location'
+require 'rubocop/rspec/blank_line_separation'
+require 'rubocop/rspec/language'
+
+module RuboCop
+  module Cop
+    module RSpec
+      # Checks if there is an empty line after shared example blocks.
+      #
+      # @example
+      #   # bad
+      #   RSpec.describe Foo do
+      #     it_behaves_like 'do this first'
+      #     it_behaves_like 'does this' do
+      #     end
+      #     it_behaves_like 'does that' do
+      #     end
+      #     it_behaves_like 'do some more'
+      #   end
+      #
+      #   # good
+      #   RSpec.describe Foo do
+      #     it_behaves_like 'do this first'
+      #     it_behaves_like 'does this' do
+      #     end
+      #
+      #     it_behaves_like 'does that' do
+      #     end
+      #
+      #     it_behaves_like 'do some more'
+      #   end
+      #
+      #   # fair - it's ok to have non-separated without blocks
+      #   RSpec.describe Foo do
+      #     it_behaves_like 'do this first'
+      #     it_behaves_like 'does this'
+      #   end
+      #
+      class EmptyLineAfterSharedExample < RuboCop::Cop::Cop
+        include RuboCop::RSpec::BlankLineSeparation
+        include RuboCop::RSpec::Language
+
+        MSG = 'Add an empty line after `%<example>s` block.'
+
+        def_node_matcher :shared_examples,
+                         (SharedGroups::ALL + Includes::ALL).block_pattern
+
+        def on_block(node)
+          shared_examples(node) do
+            break if last_child?(node)
+
+            missing_separating_line(node) do |location|
+              add_offense(node,
+                          location: location,
+                          message: format(MSG, example: node.method_name))
+            end
+          end
+        end
+      end
+    end
+  end
+end

spec/mailers/notify_spec.rb

@@ -70,6 +70,7 @@ describe Notify do
         it_behaves_like 'an email starting a new thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -116,6 +117,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -155,6 +157,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'a user cannot unsubscribe through footer link'
         it_behaves_like 'an email with a labels subscriptions link in its footer'
@@ -200,6 +203,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -214,6 +218,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -248,6 +253,7 @@ describe Notify do
           it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
             let(:model) { issue }
           end
+
           it_behaves_like 'it should show Gmail Actions View Issue link'
           it_behaves_like 'an unsubscribeable thread'
 
@@ -300,6 +306,7 @@ describe Notify do
         it_behaves_like 'an email starting a new thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -344,6 +351,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like "an unsubscribeable thread"
         it_behaves_like 'appearance header and footer enabled'
@@ -409,6 +417,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'a user cannot unsubscribe through footer link'
         it_behaves_like 'an email with a labels subscriptions link in its footer'
@@ -436,6 +445,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -466,6 +476,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -502,6 +513,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -533,6 +545,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -694,6 +707,7 @@ describe Notify do
       it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
         let(:model) { project_snippet }
       end
+
       it_behaves_like 'a user cannot unsubscribe through footer link'
 
       it 'has the correct subject' do
@@ -913,6 +927,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { commit }
         end
+
         it_behaves_like 'it should show Gmail Actions View Commit link'
         it_behaves_like 'a user cannot unsubscribe through footer link'
         it_behaves_like 'appearance header and footer enabled'
@@ -939,6 +954,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -965,6 +981,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -1037,6 +1054,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { commit }
         end
+
         it_behaves_like 'it should show Gmail Actions View Commit link'
         it_behaves_like 'a user cannot unsubscribe through footer link'
         it_behaves_like 'appearance header and footer enabled'
@@ -1069,6 +1087,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { merge_request }
         end
+
         it_behaves_like 'it should show Gmail Actions View Merge request link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'
@@ -1101,6 +1120,7 @@ describe Notify do
         it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
           let(:model) { issue }
         end
+
         it_behaves_like 'it should show Gmail Actions View Issue link'
         it_behaves_like 'an unsubscribeable thread'
         it_behaves_like 'appearance header and footer enabled'

spec/rubocop/cop/rspec/empty_line_after_shared_example_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+require_relative '../../../../rubocop/cop/rspec/empty_line_after_shared_example'
+
+describe RuboCop::Cop::RSpec::EmptyLineAfterSharedExample do
+  subject(:cop) { described_class.new }
+
+  it 'flags a missing empty line after `it_behaves_like` block' do
+    expect_offense(<<-RUBY)
+      RSpec.describe Foo do
+        it_behaves_like 'does this' do
+        end
+        ^^^ Add an empty line after `it_behaves_like` block.
+        it_behaves_like 'does that' do
+        end
+      end
+    RUBY
+
+    expect_correction(<<-RUBY)
+      RSpec.describe Foo do
+        it_behaves_like 'does this' do
+        end
+
+        it_behaves_like 'does that' do
+        end
+      end
+    RUBY
+  end
+
+  it 'ignores one-line shared examples before shared example blocks' do
+    expect_no_offenses(<<-RUBY)
+      RSpec.describe Foo do
+        it_behaves_like 'does this'
+        it_behaves_like 'does that' do
+        end
+      end
+    RUBY
+  end
+
+  it 'flags a missing empty line after `shared_examples`' do
+    expect_offense(<<-RUBY)
+      RSpec.context 'foo' do
+        shared_examples do
+        end
+        ^^^ Add an empty line after `shared_examples` block.
+        shared_examples 'something gets done' do
+        end
+      end
+    RUBY
+
+    expect_correction(<<-RUBY)
+      RSpec.context 'foo' do
+        shared_examples do
+        end
+
+        shared_examples 'something gets done' do
+        end
+      end
+    RUBY
+  end
+
+  it 'ignores consecutive one-liners' do
+    expect_no_offenses(<<-RUBY)
+      RSpec.describe Foo do
+        it_behaves_like 'do this'
+        it_behaves_like 'do that'
+      end
+    RUBY
+  end
+
+  it 'flags mixed one-line and multi-line shared examples' do
+    expect_offense(<<-RUBY)
+      RSpec.context 'foo' do
+        it_behaves_like 'do this'
+        it_behaves_like 'do that'
+        it_behaves_like 'does this' do
+        end
+        ^^^ Add an empty line after `it_behaves_like` block.
+        it_behaves_like 'do this'
+        it_behaves_like 'do that'
+      end
+    RUBY
+  end
+end