Add a reflection based object diff with structured format

pkg/util/diff/diff_test.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2016 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 diff
+
+import (
+	"testing"
+)
+
+func TestObjectReflectDiff(t *testing.T) {
+	expect := `
+object[other]:
+  a: 2
+  b: <nil>
+object[test]:
+  a: 1
+  b: 2
+object[third]:
+  a: <nil>
+  b: 3`
+	a := map[string]int{"test": 1, "other": 2}
+	b := map[string]int{"test": 2, "third": 3}
+	if actual := ObjectReflectDiff(a, b); actual != expect {
+		t.Errorf("unexpected output: %s", actual)
+	}
+}