public function testGetByIds()
 {
     $cat1 = $this->saveTestCategory('Test Category');
     $cat2 = $this->saveTestCategory('Test Category 2');
     $this->assertCount(0, $this->repository->getByIds([99]));
     $this->assertCount(1, $this->repository->getByIds([$cat1->id, 99]));
     $this->assertCount(2, $this->repository->getByIds([$cat1->id, $cat2->id]));
 }