Fix rubocop issue

Author: ahangarha

.rubocop.yml

@@ -86,4 +86,4 @@ Naming/RescuedExceptionsVariableName:
 
 Metrics/BlockLength:
   Exclude:
-    - 'test/**/*_test.rb'
+    - 'test/**/*_test.rb'

test/react/rails/component_mount_test.rb

@@ -2,6 +2,7 @@
 
 require "test_helper"
 
+# rubocop:disable Metrics/ClassLength
 class ComponentMountTest < ActionDispatch::IntegrationTest
   module DummyRenderer
     def self.render(component_name, props, _prerender_options)
@@ -216,3 +217,4 @@ def self.react_rails_prerenderer
     end
   end
 end
+# rubocop:enable Metrics/ClassLength