pkg/cli/values/options_test.go: re-add MergeValues test with mergeMaps

Signed-off-by: Joe Lanford <joe.lanford@gmail.com>

pkg/cli/values/options_test.go

@@ -0,0 +1,77 @@
+/*
+Copyright The Helm 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 values
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestMergeValues(t *testing.T) {
+	nestedMap := map[string]interface{}{
+		"foo": "bar",
+		"baz": map[string]string{
+			"cool": "stuff",
+		},
+	}
+	anotherNestedMap := map[string]interface{}{
+		"foo": "bar",
+		"baz": map[string]string{
+			"cool":    "things",
+			"awesome": "stuff",
+		},
+	}
+	flatMap := map[string]interface{}{
+		"foo": "bar",
+		"baz": "stuff",
+	}
+	anotherFlatMap := map[string]interface{}{
+		"testing": "fun",
+	}
+
+	testMap := mergeMaps(flatMap, nestedMap)
+	equal := reflect.DeepEqual(testMap, nestedMap)
+	if !equal {
+		t.Errorf("Expected a nested map to overwrite a flat value. Expected: %v, got %v", nestedMap, testMap)
+	}
+
+	testMap = mergeMaps(nestedMap, flatMap)
+	equal = reflect.DeepEqual(testMap, flatMap)
+	if !equal {
+		t.Errorf("Expected a flat value to overwrite a map. Expected: %v, got %v", flatMap, testMap)
+	}
+
+	testMap = mergeMaps(nestedMap, anotherNestedMap)
+	equal = reflect.DeepEqual(testMap, anotherNestedMap)
+	if !equal {
+		t.Errorf("Expected a nested map to overwrite another nested map. Expected: %v, got %v", anotherNestedMap, testMap)
+	}
+
+	testMap = mergeMaps(anotherFlatMap, anotherNestedMap)
+	expectedMap := map[string]interface{}{
+		"testing": "fun",
+		"foo":     "bar",
+		"baz": map[string]string{
+			"cool":    "things",
+			"awesome": "stuff",
+		},
+	}
+	equal = reflect.DeepEqual(testMap, expectedMap)
+	if !equal {
+		t.Errorf("Expected a map with different keys to merge properly with another map. Expected: %v, got %v", expectedMap, testMap)
+	}
+}