woocommerce/tests

WooCommerce Tests

Table of contents

• WooCommerce Unit Tests
  • Initial Setup
  • Running Tests
  • Writing Tests
  • Automated Tests
  • Code Coverage
• WooCommerce E2E Tests

WooCommerce Unit Tests

Initial Setup

From the WooCommerce root directory (if you are using VVV you might need to vagrant ssh first), run the following:

1. Install PHPUnit via Composer by running:

   $ composer install
   

2. Install WordPress and the WP Unit Test lib using the install.sh script:

   $ tests/bin/install.sh <db-name> <db-user> <db-password> [db-host]
   

You may need to quote strings with backslashes to prevent them from being processed by the shell or other programs.

Example:

$ tests/bin/install.sh woocommerce_tests root root

#  woocommerce_tests is the database name and root is both the MySQL user and its password.

Important: The <db-name> database will be created if it doesn't exist and all data will be removed during testing.

Running Tests

Change to the plugin root directory and type:

$ vendor/bin/phpunit

The tests will execute and you'll be presented with a summary.

You can run specific tests by providing the path and filename to the test class:

$ vendor/bin/phpunit tests/legacy/unit-tests/importer/product.php

A text code coverage summary can be displayed using the --coverage-text option:

$ vendor/bin/phpunit --coverage-text

Writing Tests

• There are two different PHPUnit directories, tests/legacy and tests/php. The tests/legacy directory contains all of the tests for code in the includes directory, and the tests/php directory is a PSR-4 namespaced directory for tests of code in the src directory.
• 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()
• In addition to covering each line of a method/function, make sure to test common input and edge cases.
• Prefer assertSame() where possible as it tests both type and value
• 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.
• 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.

Automated Tests

Tests are automatically run with Travis-CI for each commit and pull request.

Code Coverage

Code coverage is available on Codecov which receives updated data after each Travis build.

WooCommerce E2E Tests

See e2e README to learn how to setup testing environment for running e2e tests and run them.