Fix the flaky test. (#1632)

The test assumes the threads would schedule in particular way, but they don't.
But what we really care to check is that we thread in the proper RL and it works.
We don't need to check that underlying queue impl works, that's done in its own tests.
So just verify these two things.

controller/stats_reporter_test.go

@@ -38,7 +38,6 @@ func TestNewStatsReporterErrors(t *testing.T) {
 		if err == nil {
 			t.Errorf("Expected err to not be nil for value %q, got nil", v)
 		}
-
 	}
 }
 

controller/two_lane_queue_test.go

@@ -29,64 +29,60 @@ type chanRateLimiter struct {
 	t *testing.T
 	// Called when this ratelimiter is consulted for when to process a value.
 	whenCalled chan interface{}
-	retryCount map[interface{}]int
 }
 
-func (r chanRateLimiter) When(item interface{}) time.Duration {
+func (r *chanRateLimiter) When(item interface{}) time.Duration {
 	r.whenCalled <- item
-	return 0 * time.Second
+	return 0
 }
-func (r chanRateLimiter) Forget(item interface{}) {
+
+func (r *chanRateLimiter) Forget(item interface{}) {
 	r.t.Fatalf("Forgetting item %+v, we should not be forgetting any items.", item)
 }
-func (r chanRateLimiter) NumRequeues(item interface{}) int {
-	return r.retryCount[item]
+
+func (r *chanRateLimiter) NumRequeues(item interface{}) int {
+	return 0
 }
 
 var _ workqueue.RateLimiter = &chanRateLimiter{}
 
 func TestRateLimit(t *testing.T) {
-	whenCalled := make(chan interface{}, 2)
-	rl := chanRateLimiter{
-		t,
-		whenCalled,
-		make(map[interface{}]int),
+	// Verifies that we properly pass the rate limiter to the queue.
+	rl := &chanRateLimiter{
+		t:          t,
+		whenCalled: make(chan interface{}, 1),
 	}
+
 	q := newTwoLaneWorkQueue("live-in-the-limited-lane", rl)
-	q.SlowLane().Add("1")
-	q.Add("2")
-
-	k, done := q.Get()
-	q.Done(k)
-	q.AddRateLimited(k)
-	rlK := <-whenCalled
-	if got, want := k.(string), rlK.(string); got != want {
-		t.Errorf(`Got = %q, want: "%q"`, got, want)
-	}
-	if done {
-		t.Error("The queue is unexpectedly shutdown")
+	// Verify the slow lane has the proper RL.
+	q.SlowLane().AddRateLimited("1")
+	select {
+	case <-rl.whenCalled:
+		// As desired.
+	default:
+		t.Error("Didn't go to the proper rate limiter.")
 	}
 
-	k2, done := q.Get()
-	q.Done(k2)
-	q.AddRateLimited(k2)
-	rlK2 := <-whenCalled
-	if got, want := k2.(string), rlK2.(string); got != want {
-		t.Errorf(`Got = %q, want: "%q"`, got, want)
-	}
-	if s1, s2 := k.(string), k2.(string); (s1 != "1" || s2 != "2") && (s1 != "2" || s2 != "1") {
-		t.Errorf("Expected to see 1 and 2, instead saw %q and %q", s1, s2)
-	}
-	if done {
-		t.Error("The queue is unexpectedly shutdown")
+	// Verify the fast lane has the proper RL.
+	q.AddRateLimited("2")
+	select {
+	case <-rl.whenCalled:
+		// As desired.
+	default:
+		t.Error("Didn't go to the proper rate limiter.")
 	}
 
-	// Queue has async moving parts so if we check at the wrong moment, this might still be 0 or 1.
+	// Verify the items were properly added for consumption.
 	if wait.PollImmediate(10*time.Millisecond, 250*time.Millisecond, func() (bool, error) {
 		return q.Len() == 2, nil
 	}) != nil {
 		t.Error("Queue length was never 2")
 	}
+	// And drain.
+	q.ShutDown()
+	for q.Len() > 0 {
+		q.Get()
+	}
 }
 
 func TestSlowQueue(t *testing.T) {