facade always passing test never matter what return I expect

Question

SkillAssessment::shouldReceive('addTwoNumbersAndAddName')
    ->with(3,5,'john')
    ->andReturn('thisstring is random and always passes anyway1341234123412343')->once();

A very basic mockup, expected return is:

8 john

so what I wanted to write is:

SkillAssessment::shouldReceive('addTwoNumbersAndAddName')
    ->with(3,5,'john')
    ->andReturn('8 john')->once();

it always passes, never matter if I write 8 join into the return or something else.

It fails though, as soon as I start changing say:addTwoNumbersAndAddName to something else, or ->with(4,10, 'john') will fail

only the ->andReturn() wont work

I am using laravel 5.4 and the command php artisan dusk

Answer 1

The andReturn method sets what the test-double will return.

It will not check that a non-test-double would return that value on that method.

So it's perhaps just that you've confused that methods use.