Jest

• In the embedded Terminal (Alt+F12), type:

  npm install --save-dev jest

• You can also install the jest package on the Node.js and NPM page as described in npm, pnpm, and Yarn.

To run a single test from the editor

• Click or in the gutter and select Run <test_name> from the list.

  

  You can also see whether a test has passed or failed right in the editor, thanks to the test status icons and in the gutter.

To create a Jest run configuration

1. Open the Run/Debug Configuration dialog (Run | Edit Configurations on the main menu), click in the left-hand pane, and select Jest from the list. The Run/Debug Configuration: Jest dialog opens.

   tip

   Alternatively, select a test file in the Project tool window and select Create <filename> from the context menu.

2. Specify the Node.js interpreter to use. If you choose the Project alias, CLion will automatically use the project default interpreter from the Node interpreter field on the Node.js and NPM page.

   In most cases, CLion detects the project default interpreter and fills in the field itself. You can also choose another configured local interpreter or click and configure a new one.

3. Specify the location of the jest, react-scripts, react-script-ts, react-super-scripts, or react-awesome-scripts package.

4. Specify the working directory of the application. By default, the Working directory field shows the project root folder. To change this predefined setting, specify the path to the desired folder or choose a previously used folder from the list.

5. Optionally specify the jest.config file to use: select the relevant file from the list, or click and select it in the dialog that opens, or just type the path in the field. If the field is empty, CLion looks for a package.json file with a jest key. The search is performed in the file system upwards from the working directory. If no appropriate package.json file is found, then a Jest default configuration is generated on the fly.

6. Optionally configure rerunning the tests automatically on changes in the related source files. To do that, add the --watch flag in the Jest options field.

To run tests via a run configuration

1. Select the Jest run/debug configuration from the list on the main toolbar and click  to the right of the list.

2. The test server starts automatically without any steps from your side. View and analyze messages from the test server in the Run tool window.

3. Monitor test execution and analyze test results in the Test Runner tab of the Run tool window, see Explore test results for details.

To rerun failed tests

• In the Test Runner tab, click on the toolbar. CLion will execute all the tests that failed during the previous session.

• To rerun a specific failed test, select Run <test name> on its context menu.

See Rerunning tests for details.

• To jump between a test and its subject or vice versa, open the file in the editor and select Go to | Test or Go to | Test Subject from the context menu, or just press Ctrl+Shift+T.

• To jump from a test result to the test definition, click the test name in the Test Runner tab twice or select Jump to Source from the context menu. The test file opens in the editor with the cursor placed at the test definition.

• For failed tests, CLion brings you to the failure line in the test from the stack trace. If the exact line is not in the stack trace, you will be taken to the test definition.

  

  Gif

• To start debugging a single test from the editor, click or in the gutter and select Debug <test_name> from the list.

• To launch test debugging via a run/debug configuration, create a Jest run/debug configuration as described above. Then select the Jest run/debug configuration from the list on the main toolbar and click  to the right of the list.

In the Debug tool window that opens, proceed as usual: step through the tests, stop and resume test execution, examine the test when suspended, run JavaScript code snippets in the Console, and so on.

To run tests with coverage

1. Create a Jest run/debug configuration as described above.

2. Select the Jest run/debug configuration from the list on the main toolbar and click  to the right of the list.

   Alternatively, quickly run a specific suite or a test with coverage from the editor: click or in the gutter and select Run <test_name> with Coverage from the list.