59 lines
3.3 KiB
Markdown
59 lines
3.3 KiB
Markdown
# WooCommerce Unit Tests
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## Initial Setup
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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:
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```
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$ phpunit --version
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```
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2) Install WordPress and the WP Unit Test lib using the `install.sh` script. Change to the plugin root directory and type:
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```
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$ tests/bin/install.sh <db-name> <db-user> <db-password> [db-host]
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```
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Sample usage:
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$ tests/bin/install.sh woocommerce_tests root root
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**Important**: The `<db-name>` database will be created if it doesn't exist and all data will be removed during testing.
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## Running Tests
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Simply change to the plugin root directory and type:
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$ phpunit
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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.
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You can run specific tests by providing the path and filename to the test class:
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$ phpunit tests/unit-tests/api/orders
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A text code coverage summary can be displayed using the `--coverage-text` option:
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$ phpunit --coverage-text
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## Writing Tests
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* 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
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* Each test method should cover a single method or function with one or more assertions
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* A single method or function can have multiple associated test methods if it's a large or complex method
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* Use the test coverage HTML report (under `tmp/coverage/index.html`) to examine which lines your tests are covering and aim for 100% coverage
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* 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/woocommerce/woocommerce/blob/35f83867736713955fa2c4f463a024578bb88795/includes/wc-formatting-functions.php#L208-L219)
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* In addition to covering each line of a method/function, make sure to test common input and edge cases.
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* Prefer `assertsEquals()` where possible as it tests both type & equality
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* 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
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* Filters persist between test cases so be sure to remove them in your test method or in the `tearDown()` method.
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* Use data providers where possible. Be sure that their name is like `data_provider_function_to_test` (i.e. the data provider for `test_is_postcode` would be `data_provider_test_is_postcode`). Read more about data providers [here](https://phpunit.de/manual/current/en/writing-tests-for-phpunit.html#writing-tests-for-phpunit.data-providers).
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## Automated Tests
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Tests are automatically run with [Travis-CI](https://travis-ci.org/woocommerce/woocommerce) for each commit and pull request.
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## Code Coverage
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Code coverage is available on [Scrutinizer](https://scrutinizer-ci.com/g/woocommerce/woocommerce/) and [Code Climate](https://codeclimate.com/github/woocommerce/woocommerce) which receives updated data after each Travis build.
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