# Integration Testing

This folder contains the integration tests of the extension.

They are defined using [Playwright](https://playwright.dev/docs/intro) test runner.

The Playwright configuration is defined in [playwright.config.js](./playwright.config.js).

The Nbdime server configuration to use for the integration test is defined
in [jupyter_server_test_config.py](./jupyter_server_test_config.py).

The default configuration will produce video for failing tests and an HTML report.

> There is a new experimental UI mode that you may fall in love with; see [that video](https://www.youtube.com/watch?v=jF0yA-JLQW0).

## Run the tests

> All commands are assumed to be executed from the root directory

To run the tests, you need to:

1. Compile the extension:

```sh
npm install
npm run build
```

> Check the extension is installed in JupyterLab.

2. Install test dependencies (needed only once):

```sh
cd ./ui-tests
npm install
npx playwright install
cd ..
```

3. Execute the [Playwright](https://playwright.dev/docs/intro) tests:

```sh
cd ./ui-tests
npx playwright test
```

Test results will be shown in the terminal. In case of any test failures, the test report
will be opened in your browser at the end of the tests execution; see
[Playwright documentation](https://playwright.dev/docs/test-reporters#html-reporter)
for configuring that behavior.

## Update the tests snapshots

> All commands are assumed to be executed from the root directory

If you are comparing snapshots to validate your tests, you may need to update
the reference snapshots stored in the repository. To do that, you need to:

1. Compile the extension:

```sh
npm install
npm run build
```

> Check the extension is installed in JupyterLab.

2. Install test dependencies (needed only once):

```sh
cd ./ui-tests
npm install
npx playwright install
cd ..
```

3. Execute the [Playwright](https://playwright.dev/docs/intro) command:

```sh
cd ./ui-tests
npx playwright test -u
```

> Some discrepancy may occurs between the snapshots generated on your computer and
> the one generated on the CI. To ease updating the snapshots on a PR, you can
> type `please update playwright snapshots` to trigger the update by a bot on the CI.
> Once the bot has computed new snapshots, it will commit them to the PR branch.

## Create tests

> All commands are assumed to be executed from the root directory

To create tests, the easiest way is to use the code generator tool of playwright:

1. Compile the extension:

```sh
npm install
npm run build
```

> Check the extension is installed in JupyterLab.

2. Install test dependencies (needed only once):

```sh
cd ./ui-tests
npm install
npx playwright install
cd ..
```

3. Start the server:

```sh
cd ./ui-tests
npm start
```

4. Execute the [Playwright code generator](https://playwright.dev/docs/codegen) in **another terminal**:

```sh
cd ./ui-tests
npm playwright codegen localhost:8888
```

## Debug tests

> All commands are assumed to be executed from the root directory

To debug tests, a good way is to use the inspector tool of playwright:

1. Compile the extension:

```sh
npm install
npm run build
```

> Check the extension is installed in JupyterLab.

2. Install test dependencies (needed only once):

```sh
cd ./ui-tests
npm install
npx playwright install
cd ..
```

3. Execute the Playwright tests in [debug mode](https://playwright.dev/docs/debug):

```sh
cd ./ui-tests
npx playwright test --debug
```

## Upgrade Playwright and the browsers

To update the web browser versions, you must update the package `@playwright/test`:

```sh
cd ./ui-tests
npm up "@playwright/test"
npx playwright install
```
