PHPUnit 9 Shift

Requirements

• Running PHP 7.3 or higher.
• Previously running PHPUnit 8 or higher.
• Test classes within the tests folder.

Automated Changes

• Adding return types to core TestCase methods.
• Updating phpunit/phpunit composer dependency to ^9.0.
• Converting uses of the removed assertInternalType to its type specific equivalent.
• Detecting uses of the removed assertContains and converting to the string assertion when appropriate.
• Automating the changes for renamed or methods such as expectExceptionMessageRegExp and assertEquals.
• Detecting uses of removed annotations and assertions, such as @covers Classname::<*> and assertAttribute*.
• Modernizing PHP syntax, such as short arrays.

Manual Changes

While the PHPUnit 9 Shift addresses most of the backward incompatible changes, you may wish to review the release notes for additional details.