Make FilePath check suffix when given a non-const top-level node

This helps with the default feature format:

RSpec.feature "Some feature" do
end

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Master (Unreleased)
 
+* Update `RSpec/FilePath` to check suffix when given a non-constant top-level node (e.g. features). ([@topalovic][])
 * Add missing documentation for `single_statement_only` style of `RSpec/ImplicitSubject` cop. ([@tejasbubane][])
 * Fix an exception in `DescribedClass` when accessing a constant on a variable in a spec that is nested in a namespace. ([@rrosenblum][])
 * Add new `RSpec/IdenticalEqualityAssertion` cop. ([@tejasbubane][])

lib/rubocop/cop/rspec/file_path.rb

@@ -61,10 +61,10 @@ class FilePath < Base
 
         MSG = 'Spec path should end with `%<suffix>s`.'
 
-        # @!method const_described(node)
-        def_node_matcher :const_described, <<~PATTERN
+        # @!method example_group(node)
+        def_node_matcher :example_group, <<~PATTERN
           (block
-            $(send #rspec? _example_group $(const ...) $...) ...
+            $(send #rspec? _example_group $(_ ...) $...) ...
           )
         PATTERN
 
@@ -74,17 +74,17 @@ class FilePath < Base
         def on_top_level_example_group(node)
           return unless top_level_groups.one?
 
-          const_described(node) do |send_node, described_class, arguments|
+          example_group(node) do |send_node, example_group, arguments|
             next if routing_spec?(arguments)
 
-            ensure_correct_file_path(send_node, described_class, arguments)
+            ensure_correct_file_path(send_node, example_group, arguments)
           end
         end
 
         private
 
-        def ensure_correct_file_path(send_node, described_class, arguments)
-          pattern = pattern_for(described_class, arguments.first)
+        def ensure_correct_file_path(send_node, example_group, arguments)
+          pattern = pattern_for(example_group, arguments.first)
           return if filename_ends_with?(pattern)
 
           # For the suffix shown in the offense message, modify the regular
@@ -99,11 +99,13 @@ def routing_spec?(args)
           args.any?(&method(:routing_metadata?))
         end
 
-        def pattern_for(described_class, method_name)
-          return pattern_for_spec_suffix_only? if spec_suffix_only?
+        def pattern_for(example_group, method_name)
+          if spec_suffix_only? || !example_group.const_type?
+            return pattern_for_spec_suffix_only?
+          end
 
           [
-            expected_path(described_class),
+            expected_path(example_group),
             name_pattern(method_name),
             '[^/]*_spec\.rb'
           ].join

spec/rubocop/cop/rspec/file_path_spec.rb

@@ -64,6 +64,13 @@
     RUBY
   end
 
+  it 'registers an offense for a feature file missing _spec' do
+    expect_offense(<<-RUBY, 'spec/features/my_feature.rb')
+      feature "my feature" do; end
+      ^^^^^^^^^^^^^^^^^^^^ Spec path should end with `*_spec.rb`.
+    RUBY
+  end
+
   it 'registers an offense for a file without the .rb extension' do
     expect_offense(<<-RUBY, 'spec/models/user_specxrb')
       describe User do; end
@@ -265,6 +272,13 @@ class Foo
       RUBY
     end
 
+    it 'registers an offense when a feature file is missing _spec.rb suffix' do
+      expect_offense(<<-RUBY, 'spec/my_feature.rb')
+        feature "my feature" do; end
+        ^^^^^^^^^^^^^^^^^^^^ Spec path should end with `*_spec.rb`.
+      RUBY
+    end
+
     it 'registers an offense when the file extension is not .rb' do
       expect_offense(<<-RUBY, 'whatever_specxrb')
         describe MyClass do; end