Fix create migration generator with `--pretend` option

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

@@ -20,6 +20,8 @@ module Rails
         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 @@ class CreateMigrationTest < Rails::Generators::TestCase
   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