add dswp unit test case

add test case for dswp

pkg/kubelet/volumemanager/populator/BUILD

@@ -5,6 +5,7 @@ licenses(["notice"])
 load(
     "@io_bazel_rules_go//go:def.bzl",
     "go_library",
+    "go_test",
 )
 
 go_library(
@@ -42,3 +43,25 @@ filegroup(
     srcs = [":package-srcs"],
     tags = ["automanaged"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["desired_state_of_world_populator_test.go"],
+    library = ":go_default_library",
+    tags = ["automanaged"],
+    deps = [
+        "//pkg/api/v1:go_default_library",
+        "//pkg/client/clientset_generated/clientset/fake:go_default_library",
+        "//pkg/kubelet/container/testing:go_default_library",
+        "//pkg/kubelet/pod:go_default_library",
+        "//pkg/kubelet/pod/testing:go_default_library",
+        "//pkg/kubelet/secret:go_default_library",
+        "//pkg/kubelet/status:go_default_library",
+        "//pkg/kubelet/status/testing:go_default_library",
+        "//pkg/kubelet/volumemanager/cache:go_default_library",
+        "//pkg/volume/testing:go_default_library",
+        "//pkg/volume/util/types:go_default_library",
+        "//pkg/volume/util/volumehelper:go_default_library",
+        "//vendor:k8s.io/apimachinery/pkg/apis/meta/v1",
+    ],
+)

pkg/kubelet/volumemanager/populator/desired_state_of_world_populator_test.go

@@ -0,0 +1,179 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package populator
+
+import (
+	"testing"
+	"time"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/client/clientset_generated/clientset/fake"
+	containertest "k8s.io/kubernetes/pkg/kubelet/container/testing"
+	kubepod "k8s.io/kubernetes/pkg/kubelet/pod"
+	podtest "k8s.io/kubernetes/pkg/kubelet/pod/testing"
+	"k8s.io/kubernetes/pkg/kubelet/secret"
+	"k8s.io/kubernetes/pkg/kubelet/status"
+	statustest "k8s.io/kubernetes/pkg/kubelet/status/testing"
+	"k8s.io/kubernetes/pkg/kubelet/volumemanager/cache"
+	volumetesting "k8s.io/kubernetes/pkg/volume/testing"
+	"k8s.io/kubernetes/pkg/volume/util/types"
+	"k8s.io/kubernetes/pkg/volume/util/volumehelper"
+)
+
+func TestFindAndAddNewPods_FindAndRemoveDeletedPods(t *testing.T) {
+	fakeVolumePluginMgr, _ := volumetesting.GetTestVolumePluginMgr(t)
+	fakeClient := &fake.Clientset{}
+
+	fakeSecretManager := secret.NewFakeManager()
+	fakePodManager := kubepod.NewBasicPodManager(
+		podtest.NewFakeMirrorClient(), fakeSecretManager)
+
+	fakesDSW := cache.NewDesiredStateOfWorld(fakeVolumePluginMgr)
+	fakeRuntime := &containertest.FakeRuntime{}
+
+	fakeStatusManager := status.NewManager(fakeClient, fakePodManager, &statustest.FakePodDeletionSafetyProvider{})
+
+	dswp := &desiredStateOfWorldPopulator{
+		kubeClient:                fakeClient,
+		loopSleepDuration:         100 * time.Millisecond,
+		getPodStatusRetryDuration: 2 * time.Second,
+		podManager:                fakePodManager,
+		podStatusProvider:         fakeStatusManager,
+		desiredStateOfWorld:       fakesDSW,
+		pods: processedPods{
+			processedPods: make(map[types.UniquePodName]bool)},
+		kubeContainerRuntime:     fakeRuntime,
+		keepTerminatedPodVolumes: false,
+	}
+
+	pod := &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "dswp-test-pod",
+			UID:       "dswp-test-pod-uid",
+			Namespace: "dswp-test",
+		},
+		Spec: v1.PodSpec{
+			Volumes: []v1.Volume{
+				{
+					Name: "dswp-test-volume-name",
+					VolumeSource: v1.VolumeSource{
+						GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
+							PDName: "dswp-test-fake-device",
+						},
+					},
+				},
+			},
+		},
+		Status: v1.PodStatus{
+			Phase: v1.PodPhase("Running"),
+		},
+	}
+
+	fakePodManager.AddPod(pod)
+
+	podName := volumehelper.GetUniquePodName(pod)
+
+	generatedVolumeName := "fake-plugin/" + pod.Spec.Volumes[0].Name
+
+	dswp.findAndAddNewPods()
+
+	if !dswp.pods.processedPods[podName] {
+		t.Fatalf("Failed to record that the volumes for the specified pod: %s have been processed by the populator", podName)
+	}
+
+	expectedVolumeName := v1.UniqueVolumeName(generatedVolumeName)
+
+	volumeExists := fakesDSW.VolumeExists(expectedVolumeName)
+	if !volumeExists {
+		t.Fatalf(
+			"VolumeExists(%q) failed. Expected: <true> Actual: <%v>",
+			expectedVolumeName,
+			volumeExists)
+	}
+
+	if podExistsInVolume := fakesDSW.PodExistsInVolume(
+		podName, expectedVolumeName); !podExistsInVolume {
+		t.Fatalf(
+			"DSW PodExistsInVolume returned incorrect value. Expected: <true> Actual: <%v>",
+			podExistsInVolume)
+	}
+
+	verifyVolumeExistsInVolumesToMount(
+		t, v1.UniqueVolumeName(generatedVolumeName), false /* expectReportedInUse */, fakesDSW)
+
+	//let the pod be terminated
+	podGet, exist := fakePodManager.GetPodByName(pod.Namespace, pod.Name)
+	if !exist {
+		t.Fatalf("Failed to get pod by pod name: %s and namespace: %s", pod.Name, pod.Namespace)
+	}
+	podGet.Status.Phase = v1.PodFailed
+
+	//pod is added to fakePodManager but fakeRuntime can not get the pod,so here findAndRemoveDeletedPods() will remove the pod and volumes it is mounted
+	dswp.findAndRemoveDeletedPods()
+
+	if dswp.pods.processedPods[podName] {
+		t.Fatalf("Failed to remove pods from desired state of world since they no longer exist")
+	}
+
+	volumeExists = fakesDSW.VolumeExists(expectedVolumeName)
+	if volumeExists {
+		t.Fatalf(
+			"VolumeExists(%q) failed. Expected: <false> Actual: <%v>",
+			expectedVolumeName,
+			volumeExists)
+	}
+
+	if podExistsInVolume := fakesDSW.PodExistsInVolume(
+		podName, expectedVolumeName); podExistsInVolume {
+		t.Fatalf(
+			"DSW PodExistsInVolume returned incorrect value. Expected: <false> Actual: <%v>",
+			podExistsInVolume)
+	}
+
+	volumesToMount := fakesDSW.GetVolumesToMount()
+	for _, volume := range volumesToMount {
+		if volume.VolumeName == expectedVolumeName {
+			t.Fatalf(
+				"Found volume %v in the list of desired state of world volumes to mount. Expected not",
+				expectedVolumeName)
+		}
+	}
+
+}
+
+func verifyVolumeExistsInVolumesToMount(t *testing.T, expectedVolumeName v1.UniqueVolumeName, expectReportedInUse bool, dsw cache.DesiredStateOfWorld) {
+	volumesToMount := dsw.GetVolumesToMount()
+	for _, volume := range volumesToMount {
+		if volume.VolumeName == expectedVolumeName {
+			if volume.ReportedInUse != expectReportedInUse {
+				t.Fatalf(
+					"Found volume %v in the list of VolumesToMount, but ReportedInUse incorrect. Expected: <%v> Actual: <%v>",
+					expectedVolumeName,
+					expectReportedInUse,
+					volume.ReportedInUse)
+			}
+
+			return
+		}
+	}
+
+	t.Fatalf(
+		"Could not find volume %v in the list of desired state of world volumes to mount %+v",
+		expectedVolumeName,
+		volumesToMount)
+}