There are two main types of tests we run on the Conifer codebase: unit tests and end-to-end tests. Unit tests are done with PHPUnit, while end-to-end tests are done with Cypress. Since Conifer uses Lando as its official dev environment, you can leverage both testing tools without having to install them directly on your machine:

lando unit
lando e2e

It's worth mentioning that the Lando environment comes with built-in code- sniffing, courtesy of phpcs:

lando sniff

Writing new tests

Generally, new features should be covered by accompanying unit tests at a minimum. Whenever possible/applicable, it's a good idea to also write end-to- end tests in Cypress.

Our guidelines for how and what to test are:

  • One unit test case class/file per library class. For example, a new lib/Conifer/MyNewFeature.php class file should be accompanied by a test/cases/MyNewFeatureTest.php class file.
  • When in doubt about what to test, test a class's public interface. Protected and private methods are implementation details and may change, but public interfaces should, by definition, remain consistent.
  • Don't test implementation details. In other words, don't make assertions about internal state, such as protected properties. This helps avoid brittle tests that might break because of changing implementations, even as the public interface they're testing stays the same.
  • Use WP_Mock for mocking core WP calls. In other scenarios, avoid using mocks when possible: use real objects instead. If you have to mock several different things just to make an assertion about a single method, that indicates you may need to redesign your code.
  • Pull requests that include new library code but no tests will be treated as low-priority. We may ask you to add tests before accepting.
  • Exceptions to these guidelines are OK given reasonable justification.

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