用嘲弄嘲弄特质方法

Question

I have a trait:

trait A {
    function foo() {
        ...
    }
}

and a class that uses the trait like this:

class B {
    use A {
        foo as traitFoo;
    }

    function foo() {
        $intermediate = $this->traitFoo();
        ...
    }
}

I want to test the class' foo() method and want to mock (with Mockery) the behavior of the trait's foo() method. I tried using a partial and mocking traitFoo() like:

$mock = Mockery::mock(new B());
$mock->shouldReceive('traitFoo')->andReturn($intermediate);

But it doesn't work.

Is it possible to do this? Is there an alternative way? I want to test B::foo() isolating it from the trait's foo() implementation.

Thanks in advance.

Answer 1

The proxy mock you are using proxies calls from outside the mock, so internal calls within the class $this->... cannot be mocked.

If you have no final methods, you still can use normal partial mock or a passive partial mock, which extends the mocked class, and don't have such limitations:

$mock = Mockery::mock(B::class)->makePartial();
$mock->shouldReceive('traitFoo')->andReturn($intermediate);
$mock->foo();

UPDATE:

The full example with non-mocked trait functions:

use Mockery as m;

trait A
{
    function foo()
    {
        return 'a';
    }

    function bar()
    {
        return 'd';
    }
}

class B
{
    use A {
        foo as traitFoo;
        bar as traitBar;
    }

    function foo()
    {
        $intermediate = $this->traitFoo();
        return "b$intermediate" . $this->traitBar();
    }
}


class BTest extends \PHPUnit_Framework_TestCase
{

    public function testMe()
    {
        $mock = m::mock(B::class)->makePartial();
        $mock->shouldReceive('traitFoo')->andReturn('c');
        $this->assertEquals('bcd', $mock->foo());
    }
}