Mockery not executing mock method

I have class Name Validator and it has a method forVote. This is my code.

public function test_should_set_default()
    {
        $this->mock = \Mockery::mock(Validator::class);
        $this->mock->shouldReceive('forVote')
            ->andReturnTrue();
        $this->app->instance(Validator::class,$this->mock);
        $factory = new Factory();
        $this->assertTrue($factory->setDefault());
    }

So Factory calls Processor which calls Validator. Now I want mock validator to run. But it calls the real method.

What am I doing wrong?

via Chebli Mohamed