Cannot double interface that extends interface that extends \Throwable

[fbourigault]

Q	A
PHPUnit version	8.4.3, master
PHP version	7.3.12
Installation Method	Composer

Summary

Creating a mock of Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface triggers the following PHP fatal error.

PHP Fatal error: Class Mock_Exception_80007f4f contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface::getResponse) in /home/fabien/Projets/fbourigault/phpunit-mock-interface/vendor/phpunit/phpunit/src/Framework/MockObject/MockClass.php(42) : eval()'d code on line 3

How to reproduce

I wrote a reproducer as a PHPUnit e2e test: https://gist.github.com/fbourigault/8e6298706db421bee040d57dfe51000f

In the test output, we can notice the missing foo method. Also, the mock class name is not the expected one.

 declare(strict_types=1);
 
-class MockBaz extends Exception implements Baz, PHPUnit\Framework\MockObject\MockObject
+class Mock_Exception_c6cde15f extends Exception implements Baz, PHPUnit\Framework\MockObject\MockObject
 {
     use \PHPUnit\Framework\MockObject\Api;
     use \PHPUnit\Framework\MockObject\Method;
-
-    public function foo(): string
-    {
-        $__phpunit_arguments = [];
-        $__phpunit_count     = func_num_args();
-
-        if ($__phpunit_count > 0) {
-            $__phpunit_arguments_tmp = func_get_args();
-
-            for ($__phpunit_i = 0; $__phpunit_i < $__phpunit_count; $__phpunit_i++) {
-                $__phpunit_arguments[] = $__phpunit_arguments_tmp[$__phpunit_i];
-            }
-        }
-
-        $__phpunit_result = $this->__phpunit_getInvocationHandler()->invoke(
-            new \PHPUnit\Framework\MockObject\Invocation(
-                'Bar', 'foo', $__phpunit_arguments, ': string', $this, true
-            )
-        );
-
-        return $__phpunit_result;
-    }
 }

[sebastianbergmann]

This is related to the fix for #2995.