如何在PHPUnit中对当前测试类进行预测？

Question

我有这样一个案例，我想运行PHPUnit测试并检查当前测试类的行为，如下所示：

public function it_allows_to_add_items()
{
        // Create prophesies
        $managerProphecy = $this->getProphet(ListingManager::class);
        $listingItemProphecy = $this->getProphet(ListingItemInterface::class);

        $listing = factory(\App\Misc\Listings\Listing::class)->create();
        $manager = new ListingManager($listing);

        $item = factory(\App\Misc\Listings\ListingItem::class)->make(['listing_id' => null]);
        $item2 = factory(\App\Misc\Listings\ListingItem::class)->make(['listing_id' => null]);

        $manager->addItem($item);
        $managerProphecy->validate($listingItemProphecy)->shouldBeCalledTimes(2);
        $manager->addItem($item2);

        $this->assertTrue(true);
    }

这有可能吗？

我当然会得到

1) GenericListingManagerTest::it_allows_to_add_items
Some predictions failed:
  Double\App\Misc\Listings\ListingManager\P2:
    Expected exactly 2 calls that match:
      Double\App\Misc\Listings\ListingManager\P2->validate(exact(Double\ListingItemInterface\P1:00000000058d2b7a00007feda4ff3b5f Object (
        'objectProphecy' => Prophecy\Prophecy\ObjectProphecy Object (*Prophecy*)
    )))
    but none were made.