Don't generate system test files if `skip_system_test` option is specified

railties/lib/rails/generators/rails/app/templates/config/application.rb

@@ -34,6 +34,10 @@ class Application < Rails::Application
     # Middleware like session, flash, cookies can be added back manually.
     # Skip views, helpers and assets when generating a new resource.
     config.api_only = true
+<%- elsif !depends_on_system_test? -%>
+
+    # Don't generate system test files.
+    config.generators.system_tests = nil
 <%- end -%>
   end
 end

railties/test/generators/app_generator_test.rb

@@ -452,6 +452,17 @@ def test_generator_if_skip_system_test_is_given
     end
   end
 
+  def test_does_not_generate_system_test_files_if_skip_system_test_is_given
+    run_generator [destination_root, "--skip_system_test"]
+
+    Dir.chdir(destination_root) do
+      quietly { `./bin/rails g scaffold User` }
+
+      assert_no_file("test/application_system_test_case.rb")
+      assert_no_file("test/system/users_test.rb")
+    end
+  end
+
   def test_generator_if_api_is_given
     run_generator [destination_root, "--api"]
     assert_file "Gemfile" do |content|