Add RSpec/MetadataStyle and RSpec/EmptyMetadata cops

.rubocop.yml

@@ -146,6 +146,8 @@ RSpec/ContainExactly:
   Enabled: true
 RSpec/DuplicatedMetadata:
   Enabled: true
+RSpec/EmptyMetadata:
+  Enabled: true
 RSpec/Eq:
   Enabled: true
 RSpec/ExcessiveDocstringSpacing:
@@ -156,6 +158,8 @@ RSpec/IndexedLet:
   Enabled: true
 RSpec/MatchArray:
   Enabled: true
+RSpec/MetadataStyle:
+  Enabled: true
 RSpec/NoExpectationExample:
   Enabled: true
 RSpec/PendingWithoutReason:

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Split `RSpec/FilePath` into `RSpec/SpecFilePathSuffix` and `RSpec/SpecFilePathFormat`. `RSpec/FilePath` cop is enabled by default, the two new cups are pending and need to be enabled explicitly. ([@ydah])
 - Add support `RSpec/Rails/HttpStatus` when `have_http_status` with string argument. ([@ydah])
 - Fix a false positive `RSpec/Focus` when chained method call and inside define method. ([@ydah])
+- Add `RSpec/MetadataStyle` and `RSpec/EmptyMetadata` cops. ([@r7kamura])
 
 ## 2.23.2 (2023-08-09)
 

config/default.yml

@@ -359,6 +359,12 @@ RSpec/EmptyLineAfterSubject:
   StyleGuide: https://rspec.rubystyle.guide/#empty-line-after-let
   Reference: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/EmptyLineAfterSubject
 
+RSpec/EmptyMetadata:
+  Description: Avoid empty metadata hash.
+  Enabled: pending
+  VersionAdded: "<<next>>"
+  Reference: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/EmptyMetadata
+
 RSpec/Eq:
   Description: Use `eq` instead of `be ==` to compare objects.
   Enabled: pending
@@ -619,6 +625,16 @@ RSpec/MessageSpies:
   VersionAdded: '1.9'
   Reference: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/MessageSpies
 
+RSpec/MetadataStyle:
+  Description: Use consistent metadata style.
+  Enabled: pending
+  EnforcedStyle: symbol
+  SupportedStyles:
+    - hash
+    - symbol
+  VersionAdded: "<<next>>"
+  Reference: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/MetadataStyle
+
 RSpec/MissingExampleGroupArgument:
   Description: Checks that the first argument to an example group is not empty.
   Enabled: true

docs/modules/ROOT/pages/cops.adoc

@@ -31,6 +31,7 @@
 * xref:cops_rspec.adoc#rspecemptylineafterfinallet[RSpec/EmptyLineAfterFinalLet]
 * xref:cops_rspec.adoc#rspecemptylineafterhook[RSpec/EmptyLineAfterHook]
 * xref:cops_rspec.adoc#rspecemptylineaftersubject[RSpec/EmptyLineAfterSubject]
+* xref:cops_rspec.adoc#rspecemptymetadata[RSpec/EmptyMetadata]
 * xref:cops_rspec.adoc#rspeceq[RSpec/Eq]
 * xref:cops_rspec.adoc#rspecexamplelength[RSpec/ExampleLength]
 * xref:cops_rspec.adoc#rspecexamplewithoutdescription[RSpec/ExampleWithoutDescription]
@@ -61,6 +62,7 @@
 * xref:cops_rspec.adoc#rspecmessagechain[RSpec/MessageChain]
 * xref:cops_rspec.adoc#rspecmessageexpectation[RSpec/MessageExpectation]
 * xref:cops_rspec.adoc#rspecmessagespies[RSpec/MessageSpies]
+* xref:cops_rspec.adoc#rspecmetadatastyle[RSpec/MetadataStyle]
 * xref:cops_rspec.adoc#rspecmissingexamplegroupargument[RSpec/MissingExampleGroupArgument]
 * xref:cops_rspec.adoc#rspecmultipledescribes[RSpec/MultipleDescribes]
 * xref:cops_rspec.adoc#rspecmultipleexpectations[RSpec/MultipleExpectations]

docs/modules/ROOT/pages/cops_rspec.adoc

@@ -1464,6 +1464,37 @@ let(:foo) { bar }
 * https://rspec.rubystyle.guide/#empty-line-after-let
 * https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/EmptyLineAfterSubject
 
+== RSpec/EmptyMetadata
+
+|===
+| Enabled by default | Safe | Supports autocorrection | Version Added | Version Changed
+
+| Pending
+| Yes
+| Yes
+| <<next>>
+| -
+|===
+
+Avoid empty metadata hash.
+
+=== Examples
+
+==== EnforcedStyle: symbol (default)
+
+[source,ruby]
+----
+# bad
+describe 'Something', {}
+
+# good
+describe 'Something'
+----
+
+=== References
+
+* https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/EmptyMetadata
+
 == RSpec/Eq
 
 |===
@@ -3227,6 +3258,62 @@ do_something
 
 * https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/MessageSpies
 
+== RSpec/MetadataStyle
+
+|===
+| Enabled by default | Safe | Supports autocorrection | Version Added | Version Changed
+
+| Pending
+| Yes
+| Yes
+| <<next>>
+| -
+|===
+
+Use consistent metadata style.
+
+This cop does not support autocorrection in the case of
+`EnforcedStyle: hash` where the trailing metadata type is ambiguous.
+(e.g. `describe 'Something', :a, b`)
+
+=== Examples
+
+==== EnforcedStyle: symbol (default)
+
+[source,ruby]
+----
+# bad
+describe 'Something', a: true
+
+# good
+describe 'Something', :a
+----
+
+==== EnforcedStyle: hash
+
+[source,ruby]
+----
+# bad
+describe 'Something', :a
+
+# good
+describe 'Something', a: true
+----
+
+=== Configurable attributes
+
+|===
+| Name | Default value | Configurable values
+
+| EnforcedStyle
+| `symbol`
+| `hash`, `symbol`
+|===
+
+=== References
+
+* https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/MetadataStyle
+
 == RSpec/MissingExampleGroupArgument
 
 |===

lib/rubocop/cop/rspec/duplicated_metadata.rb

@@ -19,7 +19,7 @@ class DuplicatedMetadata < Base
 
         MSG = 'Avoid duplicated metadata.'
 
-        def on_metadata(symbols, _pairs)
+        def on_metadata(symbols, _hash)
           symbols.each do |symbol|
             on_metadata_symbol(symbol)
           end

lib/rubocop/cop/rspec/empty_metadata.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module RSpec
+      # Avoid empty metadata hash.
+      #
+      # @example EnforcedStyle: symbol (default)
+      #   # bad
+      #   describe 'Something', {}
+      #
+      #   # good
+      #   describe 'Something'
+      class EmptyMetadata < Base
+        extend AutoCorrector
+
+        include Metadata
+        include RangeHelp
+
+        MSG = 'Avoid empty metadata hash.'
+
+        def on_metadata(_symbols, hash)
+          return unless hash&.pairs&.empty?
+
+          add_offense(hash) do |corrector|
+            remove_empty_metadata(corrector, hash)
+          end
+        end
+
+        private
+
+        def remove_empty_metadata(corrector, node)
+          corrector.remove(
+            range_with_surrounding_comma(
+              range_with_surrounding_space(
+                node.source_range,
+                side: :left
+              ),
+              :left
+            )
+          )
+        end
+      end
+    end
+  end
+end