hash: add UT for HashString

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

upup/pkg/fi/utils/BUILD.bazel

@@ -21,6 +21,7 @@ go_test(
     name = "go_default_test",
     srcs = [
         "equals_test.go",
+        "hash_test.go",
         "sanitize_test.go",
     ],
     embed = [":go_default_library"],

upup/pkg/fi/utils/hash_test.go

@@ -0,0 +1,40 @@
+/*
+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 utils
+
+import (
+	"testing"
+)
+
+func TestSanitizeString(t *testing.T) {
+	tests := []struct {
+		s           string
+		expectedStr string
+	}{
+		{
+			s:           "test",
+			expectedStr: "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3",
+		},
+	}
+
+	for _, test := range tests {
+		result, _ := HashString(test.s)
+		if test.expectedStr != result {
+			t.Errorf("Expected %s, got %s", test.expectedStr, result)
+		}
+	}
+}