setUp() must be compatible with PHPUnit\Framework\TestCase::setUp

When setting up a new site using PHPUnit 8.x and PHP 7.2, I got the error message:

setUp() must be compatible with PHPUnit\Framework\TestCase::setUp

Because we can now define the method as returning no value (with :void) and this is part of the method definition starting in PHPUnit 8.0.0, we need to add this in our code, as well. In other words, cut and paste from my old project didn’t work. 😀

Code I Was Trying to use

protected function setUp() {
    parent::setUp();
    Monkey\setUp();
}

protected function tearDown() {
    Monkey\tearDown();
    parent::tearDown();
}

Code I Needed to Use

protected function setUp(): void {
    parent::setUp();
    Monkey\setUp();
}

protected function tearDown(): void {
    Monkey\tearDown();
    parent::tearDown();
}

Sal Ferrarello (@salcode)

Sal is a PHP developer with a focus on the WordPress platform. He is a conference speaker with a background including Piano Player, Radio DJ, Magician/Juggler, Beach Photographer, and High School Math Teacher. Sal can be found professionally at WebDevStudios, where he works as a senior backend engineer.