Mutagenesis\Utility\Runkit::reverseMutation PHP Method

    public function reverseMutation(array $mutation)
    {
        if (runkit_method_remove($mutation['class'], $mutation['method']) == false) {
            throw new \Exception('runkit_method_remove() failed attempting to remove ' . $mutation['class'] . '::' . $mutation['method']);
        }
        if (runkit_method_rename($mutation['class'], $mutation['method'] . $this->_methodPreserveCode, $mutation['method']) == false) {
            throw new \Exception('runkit_method_rename() failed renaming from ' . $mutation['class'] . '::' . $mutation['method'] . $this->_methodPreserveCode . ' to ' . $mutation['class'] . '::' . $mutation['method'] . ' (mutation reversal)');
        }
    }

 public function testShouldRevertToOriginalStaticMethodBodyWhenRequested()
 {
     $mutationInstance = new OperatorAddition(2);
     $testeeInstance = new Testee();
     $testeeInstance->setFileName($this->root . '/runkit/Math2.php')->setClassName('RunkitTest_Math2')->setMethodName('add')->setArguments('$op1,$op2')->setTokens(array(array(335, 'return', 7), array(309, '$op1', 7), '+', array(309, '$op2', 7), ';'));
     $mutant = new Mutant($testeeInstance, $mutationInstance);
     $runkit = new Runkit();
     $runkit->applyMutation($mutant);
     $runkit->reverseMutation($mutant);
     $this->assertEquals(2, \RunkitTest_Math2::add(1, 1));
 }