Added e2e test case for network partition.

Added e2e test case which verifies if a node can return to cluster after longer network partition. Valid for gce.

test/e2e/util.go

@@ -42,6 +42,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/wait"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 
 	"code.google.com/p/go-uuid/uuid"
@@ -396,6 +397,54 @@ func waitForPodSuccess(c *client.Client, podName string, contName string) error
 	return waitForPodSuccessInNamespace(c, podName, contName, api.NamespaceDefault)
 }
 
+// waitForRCPodOnNode returns the pod from the given replication controller (decribed by rcName) which is scheduled on the given node.
+// In case of failure or too long waiting time, an error is returned.
+func waitForRCPodOnNode(c *client.Client, ns, rcName, node string) (*api.Pod, error) {
+	label := labels.SelectorFromSet(labels.Set(map[string]string{"name": rcName}))
+	var p *api.Pod = nil
+	err := wait.Poll(10*time.Second, 5*time.Minute, func() (bool, error) {
+		Logf("Waiting for pod %s to appear on node %s", rcName, node)
+		pods, err := c.Pods(ns).List(label, fields.Everything())
+		if err != nil {
+			return false, err
+		}
+		for _, pod := range pods.Items {
+			if pod.Spec.NodeName == node {
+				Logf("Pod %s found on node %s", pod.Name, node)
+				p = &pod
+				return true, nil
+			}
+		}
+		return false, nil
+	})
+	return p, err
+}
+
+// waitForRCPodOnNode returns nil if the pod from the given replication controller (decribed by rcName) no longer exists.
+// In case of failure or too long waiting time, an error is returned.
+func waitForRCPodToDisappear(c *client.Client, ns, rcName, podName string) error {
+	label := labels.SelectorFromSet(labels.Set(map[string]string{"name": rcName}))
+	return wait.Poll(20*time.Second, 5*time.Minute, func() (bool, error) {
+		Logf("Waiting for pod %s to disappear", podName)
+		pods, err := c.Pods(ns).List(label, fields.Everything())
+		if err != nil {
+			return false, err
+		}
+		found := false
+		for _, pod := range pods.Items {
+			if pod.Name == podName {
+				Logf("Pod %s still exists", podName)
+				found = true
+			}
+		}
+		if !found {
+			Logf("Pod %s no longer exists", podName)
+			return true, nil
+		}
+		return false, nil
+	})
+}
+
 // Context for checking pods responses by issuing GETs to them and verifying if the answer with pod name.
 type podResponseChecker struct {
 	c              *client.Client