woocommerce/plugins/woocommerce-blocks/docs/contributors/javascript-testing.md

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# JavaScript Testing
Tests for JavaScript in the Blocks plugin are powered by [Jest](https://jestjs.io/).
The Blocks plugin follows the same patterns as Gutenberg, therefore for instructions on writing tests you can [refer to this page in the Gutenberg Handbook](https://developer.wordpress.org/block-editor/contributors/develop/testing-overview/).
We have two kinds of JavaScript tests:
- JavaScript unit tests - test APIs, hooks, library functionality that we use to build blocks or expose to plugin authors.
- End-to-end (e2e) tests - test blocks from the user interface.
These tests are all run automatically on open PRs by Travis CI.
All the following tests require that the dependencies are installed (`npm install` `composer install`). Ensure you've followed the [Getting Started Guide](getting-started.md) to set up node and other dependencies before running any tests.
## How to run JavaScript unit tests
Unit tests are implemented near the code they test, in `*.test.js` files.
Use the following command to run the unit tests:
```
$ npm run test
```
The test scripts use [wp-scripts](https://github.com/WordPress/gutenberg/tree/master/packages/scripts) to run jest for component and unit testing.
Additionally,
- `test:update` updates the snapshot tests for components, used if you change a component that has tests attached.
- `test:watch` keeps watch of files and automatically re-runs tests when things change.
## How to run end-to-end tests
End-to-end tests are implemented in `tests/e2e-tests/specs/`.
Since these drive the user interface, they need to run against a test environment - i.e. a web server running WordPress, Woo and blocks plugin, with a known state/configuration.
To set up to run e2e tests:
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- `npm run build:e2e-test` builds the assets (js/css), you can exclude this step if you've already got built files to test with.
- `npm run wp-env start` to start the test environment
Then, to run the tests:
- `npm run test:e2e`
When you're iterating on a new test you'll often run this repeatedly, as you develop, until your test is just right.
When you're done, you may want to shut down the test environment:
- `npm run wp-env stop` to stop the test environment
**Note:** There are a number of other useful `wp-env` commands. You can find out more in the [wp-env docs](https://github.com/WordPress/gutenberg/blob/master/packages/env/README.md).
### Modify the local environment used by end-to-end tests
To modify the environment used by tests locally, you will need to modify `.wp-env.json`. For example, you can set a specific WP version and install the latest Gutenberg version with these two lines:
```diff
{
- "core": "WordPress/WordPress#5.7-branch",
+ "core": "WordPress/WordPress#5.6-branch",
"plugins": [
"https://downloads.wordpress.org/plugin/woocommerce.latest-stable.zip",
"https://github.com/WP-API/Basic-Auth/archive/master.zip",
+ "https://downloads.wordpress.org/plugin/gutenberg.latest-stable.zip",
"."
],
...
}
```
You will need to stop `wp-env` and start it again. In some cases, you will also need to clean the database: `npm run wp-env clean all`.
### How to update end-to-end tests suites
We follow the same WordPress support policy as WooCommerce, this means we need to support the latest version, and the two previous ones (L-2).
For that, we run end-to-end tests against all of those versions, and because we use packages published by Gutenberg, we also run tests against the latest version of Gutenberg plugin.
When a new version of WordPress is released, we drop support for the oldest version we have, so if the latest version is 5.6, we would test against:
- WordPress 5.4
- WordPress 5.5
- WordPress 5.6
- WordPress 5.6 + Gutenberg
When 5.7 is released, we would drop support for 5.4, and update our `./.github/workflows/php-js-e2e-tests.yml` file.
You need to bump the test version, so
```yml
JSE2ETestsWP54:
name: JavaScipt E2E Tests (WP 5.4)
...
- name: E2E Tests (WP 5.4)
env:
WOOCOMMERCE_BLOCKS_PHASE: 3
WP_VERSION: 5.4-branch
run: |
JSON='{"core": "WordPress/WordPress#'"$WP_VERSION"'"}'
echo $JSON > .wp-env.override.json
npm run wp-env start
npm run wp-env clean all
npm run test:e2e
```
Would become
```yml
JSE2ETestsWP55:
name: JavaScipt E2E Tests (WP 5.5)
...
- name: E2E Tests (WP 5.5)
env:
WOOCOMMERCE_BLOCKS_PHASE: 3
WP_VERSION: 5.5-branch
run: |
JSON='{"core": "WordPress/WordPress#'"$WP_VERSION"'"}'
echo $JSON > .wp-env.override.json
npm run wp-env start
npm run wp-env clean all
npm run test:e2e
```
You also need to check any existing tests that checks the WP version.
In `./tests/e2e/specs`, verify for conditions like `if ( process.env.WP_VERSION < 5.4 )` and remove them if they're not relevant anymore.