This repository is to be used to reproduce the segmentation fault error when running a PHPUnit test under certain conditions.

There are two tests in this repo, one should document the failing case (ExampleOneTest), and the other one documents the variations that can be used to prevent the error (ExampleTwoTest).

To run the tests:

# First install the dependencies
composer install

# Then run the tests
php ./vendor/bin/phpunit

The conditions to reproduce the error are:

• The unit test creates a mock object of a class A;
• The class A contains a __destruct method;
• The __destruct method calls a method myMethod;
• myMethod is both public, and the return type is self;

class Example {
    public function myMethod(): self {
        return $this;
    }
    
    public function __destruct() {
        $this->myMethod();
    }
}

How is this affecting me?

• The test runner will fail when the segmentation fault occurs, and no further tests are run;
• If running tests in isolation, the affected test will take a few seconds to run before failing;

How to temporarily overcome this:

• Do not use public methods with a self return type belonging to the same object in the __destruct method.
• Encapsulate the destruct logic in a private method.