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Opened 3 years ago

Last modified 2 months ago

#46149 closed task (blessed)

PHPUnit 8.x support — at Initial Version

Reported by: SergeyBiryukov Owned by:
Milestone: 5.9 Priority: high
Severity: normal Version:
Component: Build/Test Tools Keywords: has-patch has-unit-tests early php8 has-dev-note
Focuses: Cc:


Background: #43218

PHPUnit 8.0.0 is scheduled for February 2019. The changelog includes some backwards compatibility breaks.

From the PHPUnit 7 announcement (February 2, 2018):

Looking Forward

The following methods do not have a return value and should therefore have a void return type declaration:

  • PHPUnit\Framework\TestCase::setUpBeforeClass()
  • PHPUnit\Framework\TestCase::setUp()
  • PHPUnit\Framework\TestCase::assertPreConditions()
  • PHPUnit\Framework\TestCase::assertPostConditions()
  • PHPUnit\Framework\TestCase::tearDown()
  • PHPUnit\Framework\TestCase::tearDownAfterClass()
  • PHPUnit\Framework\TestCase::onNotSuccessfulTest()

These methods will have a void return type declaration in PHPUnit 8. Please declare your methods that overwrite the above mentioned methods void now so you are not affected by this backward compatibility break.

This is now implemented in PHPUnit 8, so our method signatures are no longer compatible and cause fatal errors:

Fatal error: Declaration of WP_UnitTestCase_Base::setUpBeforeClass() must be compatible with PHPUnit\Framework\TestCase::setUpBeforeClass(): void in tests/phpunit/includes/abstract-testcase.php on line 1110

We could look into using different signatures for different PHPUnit versions in the same way as in [44701]. However, given the large number of tests extending the ::setUp() and ::tearDown() methods, it's probably easier to address this when we bump the required PHP version to 7.

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