Merge pull request #1654 from rubocop/fix-ExcessiveDocstringSpacing

Fix a false negative for `RSpec/ExcessiveDocstringSpacing` when finds description with em space

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Master (Unreleased)
 
+- Fix a false negative for `RSpec/ExcessiveDocstringSpacing` when finds description with em space. ([@ydah])
+
 ## 2.22.0 (2023-05-06)
 
 - Extract factory_bot cops to a separate repository, [`rubocop-factory_bot`](https://github.com/rubocop/rubocop-factory_bot). The `rubocop-factory_bot` repository is a dependency of `rubocop-rspec` and the factory_bot cops are aliased (`RSpec/FactoryBot/Foo` == `FactoryBot/Foo`) until v3.0 is released, so the change will be invisible to users until then. ([@ydah])

lib/rubocop/cop/rspec/excessive_docstring_spacing.rb

@@ -52,14 +52,21 @@ def on_send(node)
 
         # @param text [String]
         def excessive_whitespace?(text)
-          return true if text.start_with?(' ') || text.end_with?(' ')
-
-          text.match?(/[^\n ]  +[^ ]/)
+          text.match?(/
+            # Leading space
+            \A[[:blank:]]
+            |
+            # Trailing space
+            [[:blank:]]\z
+            |
+            # Two or more consecutive spaces, except if they are leading spaces
+            [^[[:space:]]][[:blank:]]{2,}[^[[:blank:]]]
+          /x)
         end
 
         # @param text [String]
         def strip_excessive_whitespace(text)
-          text.strip.gsub(/  +/, ' ')
+          text.strip.gsub(/[[:blank:]]{2,}/, ' ')
         end
 
         # @param node [RuboCop::AST::Node]

spec/rubocop/cop/rspec/excessive_docstring_spacing_spec.rb

@@ -26,6 +26,19 @@
       RUBY
     end
 
+    it 'finds description with leading em space' do
+      expect_offense(<<-RUBY)
+        describe '　　#mymethod' do
+                  ^^^^^^^^^^^ Excessive whitespace.
+        end
+      RUBY
+
+      expect_correction(<<-RUBY)
+        describe '#mymethod' do
+        end
+      RUBY
+    end
+
     it 'finds interpolated description with leading whitespace' do
       expect_offense(<<-'RUBY')
         describe "  ##{:stuff}" do
@@ -52,6 +65,19 @@
       RUBY
     end
 
+    it 'finds description with trailing em space' do
+      expect_offense(<<-RUBY)
+        describe '#mymethod　　' do
+                  ^^^^^^^^^^^ Excessive whitespace.
+        end
+      RUBY
+
+      expect_correction(<<-RUBY)
+        describe '#mymethod' do
+        end
+      RUBY
+    end
+
     it 'finds interpolated description with trailing whitespace' do
       expect_offense(<<-'RUBY')
         describe "##{:stuff}  " do