add unit tests for kubenet

pkg/kubelet/network/kubenet/kubenet_linux_test.go

+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 kubenet
+
+import (
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+	"k8s.io/kubernetes/pkg/kubelet/network"
+	nettest "k8s.io/kubernetes/pkg/kubelet/network/testing"
+	"k8s.io/kubernetes/pkg/util/exec"
+	"testing"
+)
+
+func newFakeKubenetPlugin(initMap map[kubecontainer.ContainerID]string, execer exec.Interface, host network.Host) network.NetworkPlugin {
+	return &kubenetNetworkPlugin{
+		podCIDRs: initMap,
+		execer:   execer,
+		MTU:      1460,
+		host:     host,
+	}
+}
+
+func TestGetPodNetworkStatus(t *testing.T) {
+	podIPMap := make(map[kubecontainer.ContainerID]string)
+	podIPMap[kubecontainer.ContainerID{ID: "1"}] = "10.245.0.2/32"
+	podIPMap[kubecontainer.ContainerID{ID: "2"}] = "10.245.0.3/32"
+
+	fhost := nettest.NewFakeHost(nil)
+	fakeKubenet := newFakeKubenetPlugin(podIPMap, nil, fhost)
+
+	testCases := []struct {
+		id          string
+		expectError bool
+		expectIP    string
+	}{
+		//in podCIDR map
+		{
+			"1",
+			false,
+			"10.245.0.2",
+		},
+		{
+			"2",
+			false,
+			"10.245.0.3",
+		},
+		//not in podCIDR map
+		{
+			"3",
+			true,
+			"",
+		},
+		//TODO: add test cases for retrieving ip inside container network namespace
+	}
+
+	for i, tc := range testCases {
+		out, err := fakeKubenet.GetPodNetworkStatus("", "", kubecontainer.ContainerID{ID: tc.id})
+		if tc.expectError {
+			if err == nil {
+				t.Errorf("Test case %d expects error but got none", i)
+			}
+			continue
+		} else {
+			if err != nil {
+				t.Errorf("Test case %d expects error but got error: %v", i, err)
+			}
+		}
+		if tc.expectIP != out.IP.String() {
+			t.Errorf("Test case %d expects ip %s but got %s", i, tc.expectIP, out.IP.String())
+		}
+	}
+}
+
+//TODO: add unit test for each implementation of network plugin interface