systemd: add UT for EscapeCommand

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

pkg/systemd/BUILD.bazel

@@ -15,6 +15,7 @@ go_library(
 go_test(
     name = "go_default_test",
     srcs = [
+        "escaping_test.go",
         "manifest_test.go",
         "unit_test.go",
     ],

pkg/systemd/escaping_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 systemd
+
+import (
+	"testing"
+)
+
+func TestEscapeCommand(t *testing.T) {
+	tests := []struct {
+		argv        []string
+		expectedStr string
+	}{
+		{
+			argv:        []string{`a`, `(b)`, `\c`, `\\d`, `"`, ` `},
+			expectedStr: `a (b) \\c \\\\d \" " "`,
+		},
+		{
+			argv:        []string{"/usr/bin/docker", "pull", "busybox:latest"},
+			expectedStr: "/usr/bin/docker pull busybox:latest",
+		},
+	}
+	for _, test := range tests {
+		result := EscapeCommand(test.argv)
+		if test.expectedStr != result {
+			t.Errorf("Expected %s, got %s", test.expectedStr, result)
+		}
+	}
+}