Fix race in stress-test-e2e.

Add a function which would return error instead failing the test.
Add error stream to finish stress test gracefully in case there is no
capacity in a cluster for a specific test.
It is forbidden to call t.Fatalf() from go routine other than main test
routine.

test/e2e/fleet_test.go

@@ -801,8 +801,9 @@ func TestScaleUpAndDownInParallelStressTest(t *testing.T) {
 			framework.WaitForFleetCondition(t, flt, e2e.FleetReadyCount(0))
 		}
 	}
-
+	errors := make(chan error)
 	var wg sync.WaitGroup
+	finished := make(chan bool, 1)
 
 	for fleetNumber, flt := range fleets {
 		wg.Add(1)
@@ -815,19 +816,46 @@ func TestScaleUpAndDownInParallelStressTest(t *testing.T) {
 			}()
 
 			if fleetNumber%2 == 0 {
-				scaleDownStats.ReportDuration(scaleAndWait(t, flt, 0), nil)
+				duration, err := scaleAndWait(t, flt, 0)
+				if err != nil {
+					fmt.Println(err)
+					errors <- err
+					return
+				}
+				scaleDownStats.ReportDuration(duration, nil)
 			}
 			for i := 0; i < repeatCount; i++ {
 				if time.Now().After(deadline) {
 					break
 				}
-				scaleUpStats.ReportDuration(scaleAndWait(t, flt, fleetSize), nil)
-				scaleDownStats.ReportDuration(scaleAndWait(t, flt, 0), nil)
+				duration, err := scaleAndWait(t, flt, fleetSize)
+				if err != nil {
+					fmt.Println(err)
+					errors <- err
+					return
+				}
+				scaleUpStats.ReportDuration(duration, nil)
+				duration, err = scaleAndWait(t, flt, 0)
+				if err != nil {
+					fmt.Println(err)
+					errors <- err
+					return
+				}
+				scaleDownStats.ReportDuration(duration, nil)
 			}
 		}(fleetNumber, flt)
 	}
+	go func() {
+		wg.Wait()
+		close(finished)
+	}()
 
-	wg.Wait()
+	select {
+	case <-finished:
+	case err := <-errors:
+		t.Fatalf("Error in waiting for a fleet to scale: %s", err)
+	}
+	fmt.Println("We are Done")
 }
 
 // Creates a fleet and one GameServer with Packed scheduling.
@@ -999,11 +1027,12 @@ func schedulingFleetPatch(t *testing.T,
 	return fltRes
 }
 
-func scaleAndWait(t *testing.T, flt *agonesv1.Fleet, fleetSize int32) time.Duration {
+func scaleAndWait(t *testing.T, flt *agonesv1.Fleet, fleetSize int32) (duration time.Duration, err error) {
 	t0 := time.Now()
 	scaleFleetSubresource(t, flt, fleetSize)
-	framework.WaitForFleetCondition(t, flt, e2e.FleetReadyCount(fleetSize))
-	return time.Since(t0)
+	err = framework.WaitForFleetConditionParallel(t, flt, e2e.FleetReadyCount(fleetSize))
+	duration = time.Since(t0)
+	return
 }
 
 // scaleFleetPatch creates a patch to apply to a Fleet.

test/e2e/framework/framework.go

@@ -129,8 +129,17 @@ func (f *Framework) WaitForGameServerState(gs *agonesv1.GameServer, state agones
 }
 
 // WaitForFleetCondition waits for the Fleet to be in a specific condition or fails the test if the condition can't be met in 5 minutes.
-// nolint: dupl
 func (f *Framework) WaitForFleetCondition(t *testing.T, flt *agonesv1.Fleet, condition func(fleet *agonesv1.Fleet) bool) {
+	t.Helper()
+	err := f.WaitForFleetConditionParallel(t, flt, condition)
+	if err != nil {
+		// Do not call Fatalf() from go routine other than main test go routine, because it could cause a race
+		t.Fatalf("error waiting for fleet condition on fleet %v", flt.Name)
+	}
+}
+
+// WaitForFleetConditionParallel waits for the Fleet to be in a specific condition or returns an error if the condition can't be met in 5 minutes.
+func (f *Framework) WaitForFleetConditionParallel(t *testing.T, flt *agonesv1.Fleet, condition func(fleet *agonesv1.Fleet) bool) error {
 	t.Helper()
 	logrus.WithField("fleet", flt.Name).Info("waiting for fleet condition")
 	err := wait.PollImmediate(2*time.Second, 5*time.Minute, func() (bool, error) {
@@ -143,8 +152,9 @@ func (f *Framework) WaitForFleetCondition(t *testing.T, flt *agonesv1.Fleet, con
 	})
 	if err != nil {
 		logrus.WithField("fleet", flt.Name).WithError(err).Info("error waiting for fleet condition")
-		t.Fatalf("error waiting for fleet condition on fleet %v", flt.Name)
+		return err
 	}
+	return nil
 }
 
 // WaitForFleetAutoScalerCondition waits for the FleetAutoscaler to be in a specific condition or fails the test if the condition can't be met in 2 minutes.