Ignore non string arguments for file path cop

lib/rubocop/cop/rspec/file_path.rb

@@ -25,10 +25,7 @@ def on_top_level_describe(node, args)
           object = const_name(args.first)
           return unless object
 
-          method = args[1]
-          return unless method.nil? || method.type == :str
-
-          path_matcher = matcher(object, method)
+          path_matcher = matcher(object, args[1])
           return if source_filename =~ regexp_from_glob(path_matcher)
 
           add_offense(node, :expression, format(MESSAGE, path_matcher))
@@ -38,7 +35,9 @@ def on_top_level_describe(node, args)
 
         def matcher(object, method)
           path = File.join(parts(object))
-          path += '*' + method.children.first.gsub(/\W+/, '') if method
+          if method && method.type == :str
+            path += '*' + method.children.first.gsub(/\W+/, '')
+          end
 
           "#{path}*_spec.rb"
         end

spec/rubocop/cop/rspec/file_path_spec.rb

@@ -49,10 +49,14 @@
     expect(cop.offenses).to be_empty
   end
 
-  it 'skips specs not having a string second argument' do
-    inspect_source(cop, 'describe Some::Class, :config do; end')
-
-    expect(cop.offenses).to be_empty
+  it 'ignores second argument if is not a string' do
+    inspect_source(cop,
+                   'describe MyClass, :foo do; end',
+                   'wrong_class_spec.rb')
+    expect(cop.offenses.size).to eq(1)
+    expect(cop.offenses.map(&:line).sort).to eq([1])
+    expect(cop.messages)
+      .to eq(['Spec path should end with `my_class*_spec.rb`'])
   end
 
   it 'checks class specs' do