reeable MHC unit tests

internal/controllers/machinehealthcheck/machinehealthcheck_controller_test.go

@@ -876,13 +876,10 @@ func TestMachineHealthCheck_Reconcile(t *testing.T) {
 	})
 
 	t.Run("when a Machine has no Node ref for longer than the NodeStartupTimeout", func(t *testing.T) {
-		// FIXME: Resolve flaky/failing test
-		t.Skip("skipping until made stable")
 		g := NewWithT(t)
 		cluster := createCluster(g, ns.Name)
 
 		mhc := newMachineHealthCheck(cluster.Namespace, cluster.Name)
-		mhc.Spec.NodeStartupTimeout = &metav1.Duration{Duration: time.Second}
 
 		g.Expect(env.Create(ctx, mhc)).To(Succeed())
 		defer func(do ...client.Object) {
@@ -976,8 +973,6 @@ func TestMachineHealthCheck_Reconcile(t *testing.T) {
 	})
 
 	t.Run("when a Machine's Node has gone away", func(t *testing.T) {
-		// FIXME: Resolve flaky/failing test
-		t.Skip("skipping until made stable")
 		g := NewWithT(t)
 		cluster := createCluster(g, ns.Name)
 
@@ -2645,7 +2640,7 @@ func newMachineHealthCheck(namespace, clusterName string) *clusterv1.MachineHeal
 				},
 			},
 			MaxUnhealthy:       &maxUnhealthy,
-			NodeStartupTimeout: &metav1.Duration{Duration: 1 * time.Millisecond},
+			NodeStartupTimeout: &metav1.Duration{Duration: 5 * time.Second},
 			UnhealthyConditions: []clusterv1.UnhealthyCondition{
 				{
 					Type:    corev1.NodeReady,