PyCharm 2016.3 Help

Running Cucumber.js Unit Tests

JavaScript unit tests are run in a browser against a test server which actually handles the testing process.

This server allows you to capture a browser to run tests in, loads the test targets to the captured browser, controls the testing process, and exchanges data between the browser and PyCharm, so you can view test results without leaving the IDE.

The test server does not necessarily have to be on your machine, it can be launched right from PyCharm through the Cucumber.js test runner. Cucumber.js runs tests that are called features and are written in the Gherkin language. Each feature is described in a separate file with the extension feature.

On this page:

Before you start

  1. Download and install Node.js. The runtime environment is required for two reasons:
    • The Cucumber.js test runner is started through Node.js.
    • NPM, which is a part of the runtime environment, is also the easiest way to download the Cucumber.js test runner.

    If you are going to use the command line mode, make sure the path to the parent folder of the Node.js executable file and the path to the npm folder are added to the PATH variable. This enables you to launch the Cucumber.js test runner and npm from any folder.

  2. Make sure the Cucumber.js test runner is installed as described in Preparing to Use Cucumber.Js Test Runner.
  3. Install and enable the NodeJS repository plugin as described in Installing, Updating and Uninstalling Repository Plugins and Enabling and Disabling Plugins.
  4. Install and enable the Cucumber.js and Gherkin plugins. The plugins are not bundled with PyCharm, but they can be installed from the JetBrains plugin repository as described in Installing, Updating and Uninstalling Repository Plugins and Enabling and Disabling Plugins. Once enabled, the plugins are available at the IDE level, that is, you can use it in all your PyCharm projects.

Creating a Cucumber.js run configuration

  1. Open the Run/Debug Configuration dialog box by doing one of the following:
    • On the main menu, choose Run | Edit Configurations.
    • Open the test file in the editor, and then choose Create <file name> on the context menu.
    • Select the test file in the Project tool window, and then choose Create <file name> on the context menu of the selection.
  2. Click the Add button /help/img/idea/new.png on the toolbar and select the Cucumber.js configuration type. The Run/Debug Configuration: Cucumber.Js dialog box opens.
  3. In the Feature file or directory text box, specify the tests to run. Cucumber.js runs tests that are called features and are written in the Gherkin language. Each feature is described in a separate file with the extension feature.
    • To have one feature executed, specify the path to the corresponding .feature file.
    • To have a bunch of features executed, specify the folder where the .feature files to run are stored.
  4. In the Executable path text box, specify the location of the cucumber executable file, .cmd, .bat, or other depending on the operating system used. The location depends on the installation mode, see Installing the Cucumber.js test runner.
  5. Optionally, specify the command line arguments to be passed to the Cucumber.js executable file, such as -r (--require LIBRARY|DIR), -t (--tags TAG_EXPRESSION), or --coffee. For details, see Cucumber's native built-in help available through the following command:
    cucumber-js --help
  6. Apply the changes and close the dialog box.

Launching unit tests

  1. The test server starts automatically without any steps from your side. View and analyze messages from the test server in the Run tool window.
  2. Monitor test execution in the Test Runner tab of the Run tool window as described inMonitoring and Managing Tests.

See Also

Last modified: 23 November 2016