kubectl describe <kind> work with no arguments

Add describe_resource_assert to test describe <kind> with no object arg

pkg/kubectl/cmd/describe.go

@@ -56,6 +56,9 @@ $ kubectl describe pods/nginx
 // Describe a pod using the data in pod.json.
 $ kubectl describe -f pod.json
 
+// Describe all pods
+$ kubectl describe pods
+
 // Describe pods by label name=myLabel
 $ kubectl describe po -l name=myLabel
 
@@ -100,7 +103,7 @@ func RunDescribe(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []s
 		NamespaceParam(cmdNamespace).DefaultNamespace().
 		FilenameParam(enforceNamespace, filenames...).
 		SelectorParam(selector).
-		ResourceTypeOrNameArgs(false, args...).
+		ResourceTypeOrNameArgs(true, args...).
 		Flatten().
 		Do()
 	err = r.Err()

pkg/kubectl/cmd/describe_test.go

@@ -81,3 +81,22 @@ func TestDescribeObject(t *testing.T) {
 		t.Errorf("unexpected output: %s", buf.String())
 	}
 }
+
+func TestDescribeListObjects(t *testing.T) {
+	pods, _, _ := testData()
+	f, tf, codec := NewAPIFactory()
+	d := &testDescriber{Output: "test output"}
+	tf.Describer = d
+	tf.Client = &client.FakeRESTClient{
+		Codec: codec,
+		Resp:  &http.Response{StatusCode: 200, Body: objBody(codec, pods)},
+	}
+
+	tf.Namespace = "test"
+	buf := bytes.NewBuffer([]byte{})
+	cmd := NewCmdDescribe(f, buf)
+	cmd.Run(cmd, []string{"pods"})
+	if buf.String() != fmt.Sprintf("%s\n\n%s\n\n", d.Output, d.Output) {
+		t.Errorf("unexpected output: %s", buf.String())
+	}
+}