How to throw an exception on the Nth call of a mock method with Mockery

问题

I need to test how some code I wrote will behave when it calls a method on another class multiple times, where one of the calls will cause an exception to be thrown.

I am using Mockery to mock the class that may throw an exception.

So in my case, the method will be called three times and I need it throw an exception on the second time.

This is example of my intention but it doesn't work.

$mock = \Mockery::mock();
$mock->shouldReceive('fetch')
    ->andReturnUsing(
        function () {return true;},
        function () use ($e) {throw new \Exception();},
        function () {return false;}
    );

I was given the impression the above might work from the response in Asserting that mock throws exception · Issue #308 · mockery/mockery.

However, in practice, throwing an exception this way causes Mockery to catch the exception and throw its own BadMethodCall exception.

回答1:

I found the answer amongst the Mockery Github Issues, Mock multiple method call with return and throw.

$mock = \Mockery::mock();
$mock->shouldReceive('fetch')
    ->andReturnUsing(
        function () use () {
            static $counter = 0;

            switch ($counter++) {
                case 0:
                    return true;
                    break;
                case 1:
                    throw new \Exception();
                    break;
                default:
                    return false;
                    break;
            }
        }
    );

For those looking for a solution using PHPUnit...

$mockHydrator = $this->createMock(MyObject::class);
$mockHydrator->method('fetch')
    ->will(
        $this->onConsecutiveCalls(
            true,
            $this->throwException($e),
            false
        )
    );

This is one case where I feel PHPUnit mocks provides a better interface than Mockery.

来源：https://stackoverflow.com/questions/50900843/how-to-throw-an-exception-on-the-nth-call-of-a-mock-method-with-mockery

标签

php

unit-testing

mockery