Merge pull request rails#41255 from euxx/fix-create-migration-generator-with-pretend-option

Fix create migration generator with `--pretend` option

Author: rafaelfranca

railties/lib/rails/generators/actions/create_migration.rb

@@ -20,6 +20,8 @@ def identical?
         end
 
         def invoke!
+          return super if pretend?
+
           invoked_file = super
           File.exist?(@destination) ? invoked_file : relative_existing_migration
         end

railties/test/generators/create_migration_test.rb

@@ -55,6 +55,8 @@ def test_invoke
   def test_invoke_pretended
     create_migration(default_destination_path, {}, { pretend: true })
 
+    stdout = invoke!
+    assert_match(/create  db\/migrate\/1_create_articles\.rb\n/, stdout)
     assert_no_file @migration.destination
   end