使用Mockery在Laravel中的存储库模式中模拟查找（$ collection）

Question

I'm doing unit testing and my repository has this method:

/**
 * @param int|Collection $id
 * @return MyModel|Collection|null
 */
 public function find($id);

I tried this:

$this->package_repo = Mockery::mock(PackageRepositoryInterface::class);
$this->app->instance('Package', $this->package_repo);
// ...
$this->ticket_repo->shouldReceive("find")->with(collect([]))->andReturn(/*...*/);

//...

echo $this->ticket_repo->find(collect([]));  // Failed here.

The test immediately failed, and I think it's because the 2 collections in the shouldReceive expectation statement and the actual find statement are distinct objects.

If I want to mock the behavior of $this->ticket_repo->find($ids) , what should I do?

Or rather, if there is a better way to design a testable algorithm, how would it be? Because I would like to have all the ids to I want to find be in an array, and be constructed into a single SQL select query, instead of a few hundred separate ones, for performance purposes.

Also asked here: https://laracasts.com/discuss/channels/testing/mocking-findcollection-in-repository-pattern-in-laravel-with-mockery#

Answer 1

You have to mock a concrete class and not the interface. Since you haven't provided the name I'm just guessing:

$mock = Mockery::mock(TicketRepo::class);
$this->app->swap('PackageRepo', $mock);

So now whenever someone asks for an instance by the Interface name they'll get the mock.