selectingObjects map[Key]*selectingObject

	// Associations.
	labeledBySelecting map[selectorKey]*labeledObjects
	selectingByLabeled map[labelsKey]*selectingObjects
}

// NewBiMultimap creates a map.
func NewBiMultimap() *BiMultimap {
	return &BiMultimap{
		labeledObjects:     make(map[Key]*labeledObject),
		selectingObjects:   make(map[Key]*selectingObject),
		labeledBySelecting: make(map[selectorKey]*labeledObjects),

			}
			permutations = [][]int{p}
		}
		for _, permutation := range permutations {
			name := tc.name + fmt.Sprintf(" permutation %v", permutation)
			t.Run(name, func(t *testing.T) {
				multimap := NewBiMultimap()
				for i := range permutation {
					tc.ops[i](multimap)
					// Run consistency check after every operation.
					err := consistencyCheck(multimap)
					if err != nil {
						t.Fatalf(err.Error())
					}

			},
		}
		return true, obj, nil
	})

	tc.runTest(t)
}

func TestConditionNoAmbiguousSelectorWhenNoSelectorOverlapBetweenHPAs(t *testing.T) {
	hpaSelectors := selectors.NewBiMultimap()
	hpaSelectors.PutSelector(selectors.Key{Name: "test-hpa-2", Namespace: testNamespace}, labels.SelectorFromSet(labels.Set{"cheddar": "cheese"}))

	tc := testCase{
		minReplicas:             2,

		scaleUpEventsLock:   sync.RWMutex{},
		scaleDownEvents:     map[string][]timestampedScaleEvent{},
		scaleDownEventsLock: sync.RWMutex{},
		hpaSelectors:        selectors.NewBiMultimap(),
	}

	hpaInformer.Informer().AddEventHandlerWithResyncPeriod(
		cache.ResourceEventHandlerFuncs{
			AddFunc:    hpaController.enqueueHPA,
			UpdateFunc: hpaController.updateHPA,