pretty: add UT for LongDesc

Signed-off-by: Zhou Hao <zhouhao@cn.fujitsu.com>

pkg/pretty/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
@@ -7,3 +7,9 @@ go_library(
     visibility = ["//visibility:public"],
     deps = ["//vendor/github.com/MakeNowJust/heredoc:go_default_library"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["help_test.go"],
+    embed = [":go_default_library"],
+)

pkg/pretty/help_test.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2019 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 pretty
+
+import (
+	"testing"
+)
+
+func TestLongDesc(t *testing.T) {
+	tests := []struct {
+		desc        string
+		expectedStr string
+	}{
+		{
+			desc:        "    test1    ",
+			expectedStr: "test1",
+		},
+		{
+			desc:        "test1\n   test2\n",
+			expectedStr: "test1\ntest2",
+		},
+	}
+	for _, test := range tests {
+		result := LongDesc(test.desc)
+		if test.expectedStr != result {
+			t.Errorf("Expected %s, got %s", test.expectedStr, result)
+		}
+	}
+}