PHPUnit: How to assert that a class extends another class?

Question

In my PHPUnit test, I would like to assert that the class that I am testing extends another class. How can I do this with PHPUnit?

Answer 1

Use assertInstanceOf() instead of PHP's built in instanceof operator or functions so that you get a meaningful failure message.

function testInstanceOf() {
    $obj = new Foo;
    self::assertInstanceOf('Bar', $obj);
}

...

Failed asserting that <Foo> is an instance of class "Bar".

Answer 2

Or also you should use this assert like this:

    $this->assertSame(
        'Symfony\Component\Form\AbstractType',
        get_parent_class('AppBundle\Form\CarType'),
        'The form does not extend the AbstractType class'
        );

Answer 3

What about using instanceof?

-> http://php.net/manual/en/internals2.opcodes.instanceof.php