wordpress-develop/tests/phpunit
Felix Arntz 23b007b126 Media: Prevent special images within post content to skew image counts and cause lazy-loading bugs.
In order to skip lazy-loading the first few images on a page, as of WordPress 5.9 there has been logic to count images that are eligible based on certain criteria. One of those groups are images that appear within the content of a post.

This changeset fixes a bug where images created via `get_the_post_thumbnail()` or `wp_get_attachment_image()` that are injected into the post content would skew the count and therefore result in all images to be lazy-loaded, potentially hurting load time performance. This is relevant for example when those functions are called in server-side rendered blocks, or any other filter callbacks hooked into `the_content`.

Props flixos90, antpb, joedolson, spacedmonkey, mukesh27, thekt12, costdev, jrf.
Fixes #58089.
See #53675.


git-svn-id: https://develop.svn.wordpress.org/trunk@55825 602fd350-edb4-49c9-b593-d223f7449a82
2023-05-18 19:53:37 +00:00
..
data Editor: Add selectors field to block type definition 2023-04-21 10:41:58 +00:00
includes Networks and Sites: Lazy load site meta. 2023-05-11 11:13:10 +00:00
tests Media: Prevent special images within post content to skew image counts and cause lazy-loading bugs. 2023-05-18 19:53:37 +00:00
multisite.xml Build/Test Tools: Update PHPUnit configuration for PHPUnit 9.5.10/8.5.21+. 2021-09-26 03:11:18 +00:00
README.txt Docs: Remove double spaces in tests/phpunit/README.txt. 2022-04-29 13:31:48 +00:00
wp-mail-real-test.php Docs: Align spelling with American English. 2022-10-21 21:10:29 +00:00

The short version:

1. Create a clean MySQL database and user. DO NOT USE AN EXISTING DATABASE or you will lose data, guaranteed.

2. Copy wp-tests-config-sample.php to wp-tests-config.php, edit it and include your database name/user/password.

3. $ svn up

4. Run the tests from the "trunk" directory:
   To execute a particular test:
      $ phpunit tests/phpunit/tests/test_case.php
   To execute all tests:
      $ phpunit

Notes:

Test cases live in the 'tests' subdirectory. All files in that directory will be included by default. Extend the WP_UnitTestCase class to ensure your test is run.

phpunit will initialize and install a (more or less) complete running copy of WordPress each time it is run. This makes it possible to run functional interface and module tests against a fully working database and codebase, as opposed to pure unit tests with mock objects and stubs. Pure unit tests may be used also, of course.

Changes to the test database will be rolled back as tests are finished, to ensure a clean start next time the tests are run.

phpunit is intended to run at the command line, not via a web server.