woocommerce/tests/README.md

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# WooCommerce Unit Tests
## Initial Setup
1) Install [PHPUnit](http://phpunit.de/) by following their [installation guide](https://phpunit.de/getting-started.html). If you've installed it correctly, this should display the version:
$ phpunit --version
2) Install WordPress and the WP Unit Test lib using the `install.sh` script. Change to the plugin root directory and type:
$ tests/bin/install.sh <db-name> <db-user> <db-password> [db-host]
Sample usage:
$ tests/bin/install.sh woocommerce_tests root root
**Important**: The `<db-name>` database will be created if it doesn't exist and all data will be removed during testing.
## Running Tests
Simply change to the plugin root directory and type:
$ phpunit
The tests will execute and you'll be presented with a summary. Code coverage documentation is automatically generated as HTML in the `tmp/coverage` directory.
You can run specific tests by providing the path and filename to the test class:
$ phpunit tests/unit-tests/api/webhooks
A text code coverage summary can be displayed using the `--coverage-text` option:
$ phpunit --coverage-text
## Writing Tests
* Each test file should roughly correspond to an associated source file, e.g. the `formatting/functions.php` test file covers code in the `wc-formatting-functions.php` file
* Each test method should cover a single method or function with one or more assertions
* A single method or function can have multiple associated test methods if it's a large or complex method
* Use the test coverage HTML report (under `tmp/coverage/index.html`) to examine which lines your tests are covering and aim for 100% coverage
* For code that cannot be tested (e.g. they require a certain PHP version), you can exclude them from coverage using a comment: `// @codeCoverageIgnoreStart` and `// @codeCoverageIgnoreEnd`. For example, see [`wc_round_tax_total()`](https://github.com/woothemes/woocommerce/blob/master/includes/wc-formatting-functions.php#L155-155)
* In addition to covering each line of a method/function, make sure to test common input and edge cases.
* Prefer `assertsEquals()` where possible as it tests both type & equality
* Remember that only methods prefixed with `test` will be run so use helper methods liberally to keep test methods small and reduce code duplication. If there is a common helper method used in multiple test files, consider adding it to the `WC_Unit_Test_Case` class so it can be shared by all test cases
* Filters persist between test cases so be sure to remove them in your test method or in the `tearDown()` method.
## Automated Tests
Tests are automatically run with [Travis-CI](https://travis-ci.org) for each commit and pull request.
## Code Coverage
Code coverage is available on [Coveralls](https://coveralls.io/) which receives updated data after each Travis build.