Assert\AssertionChain::setAssertionClassName PHP Method

    public function setAssertionClassName($className)
    {
        if (!is_string($className)) {
            throw new LogicException('Exception class name must be passed as a string');
        }
        if ($className !== 'Assert\\Assertion' && !is_subclass_of($className, 'Assert\\Assertion')) {
            throw new LogicException($className . ' is not (a subclass of) Assert\\Assertion');
        }
        $this->assertionClassName = $className;
        return $this;
    }