How is mock different from stub in phunit?

Question

PHP

Mock - used to check the state of an object, for example, to check if a
Stub method was called - used to return false (test) data

Question: Is the following code a mock or a stub? We check the method call, but at the same time return false data

$observer = $this->createMock(Observer::class);

        $observer->expects($this->once())
        ->method('abstractMethod')
        ->will($this->returnValue('wow'));

Answer 1

https://vc.ru/flood/44925-za-chto-ya-cenyu-testiro...

The main difference between stubs and mocks is that in one case we are managing the state and in the other we are managing the behavior.
When we use mocks, we are replacing the entire module with a mock (false, test object that mimics the real one). And stub is a function that always outputs the same result, no matter what was input. Mocks are used to check if the function was called with the correct arguments, and stubs are used to test how the function works with the received response. Stubs are used to check the state of a method, and mocks are used to adjust behavior.