add test and fix typo in daemoncontroller

pkg/controller/daemon/daemoncontroller.go

@@ -814,7 +814,7 @@ func (dsc *DaemonSetsController) syncDaemonSet(key string) error {
 // summary. Returned booleans are:
 // * wantToRun:
 //     Returns true when a user would expect a pod to run on this node and ignores conditions
-//     such as OutOfDisk or insufficent resource that would cause a daemonset pod not to schedule.
+//     such as OutOfDisk or insufficient resource that would cause a daemonset pod not to schedule.
 //     This is primarily used to populate daemonset status.
 // * shouldSchedule:
 //     Returns true when a daemonset should be scheduled to a node if a daemonset pod is not already

pkg/controller/daemon/daemoncontroller_test.go

@@ -455,7 +455,7 @@ func TestInsufficientCapacityNodeDaemonDoesNotLaunchPod(t *testing.T) {
 }
 
 // DaemonSets should not unschedule a daemonset pod from a node with insufficient free resource
-func TestInsufficentCapacityNodeDaemonDoesNotUnscheduleRunningPod(t *testing.T) {
+func TestInsufficientCapacityNodeDaemonDoesNotUnscheduleRunningPod(t *testing.T) {
 	podSpec := resourcePodSpec("too-much-mem", "75M", "75m")
 	podSpec.NodeName = "too-much-mem"
 	ds := newDaemonSet("foo")
@@ -1302,6 +1302,29 @@ func TestGetNodesToDaemonPods(t *testing.T) {
 	}
 }
 
+func TestAddNode(t *testing.T) {
+	manager, _, _ := newTestController()
+	node1 := newNode("node1", nil)
+	ds := newDaemonSet("ds")
+	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
+	manager.dsStore.Add(ds)
+
+	manager.addNode(node1)
+	if got, want := manager.queue.Len(), 0; got != want {
+		t.Fatalf("queue.Len() = %v, want %v", got, want)
+	}
+
+	node2 := newNode("node2", simpleNodeLabel)
+	manager.addNode(node2)
+	if got, want := manager.queue.Len(), 1; got != want {
+		t.Fatalf("queue.Len() = %v, want %v", got, want)
+	}
+	key, done := manager.queue.Get()
+	if key == nil || done {
+		t.Fatalf("failed to enqueue controller for node %v", node2.Name)
+	}
+}
+
 func TestAddPod(t *testing.T) {
 	manager, _, _ := newTestController()
 	ds1 := newDaemonSet("foo1")