Added tests for newly introduced util.go functions

Signed-off-by: Dmitry Chepurovskiy <dm3ch@dm3ch.net>
Signed-off-by: Dmitry Chepurovskiy <me@dm3ch.net>

pkg/storage/driver/util_test.go

@@ -0,0 +1,74 @@
+/*
+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 driver
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestIsSystemLabel(t *testing.T) {
+	tests := map[string]bool{
+		"name":  true,
+		"owner": true,
+		"test":  false,
+		"NaMe":  false,
+	}
+	for label, result := range tests {
+		if output := isSystemLabel(label); output != result {
+			t.Errorf("Output %t not equal to expected %t", output, result)
+		}
+	}
+}
+
+type filterSystemLabelsTest struct {
+	args, expected map[string]string
+}
+
+var filterSystemLabelsTests = []filterSystemLabelsTest{
+	filterSystemLabelsTest{nil, nil},
+	filterSystemLabelsTest{map[string]string{}, nil},
+	filterSystemLabelsTest{map[string]string{
+		"name":       "name",
+		"owner":      "owner",
+		"status":     "status",
+		"version":    "version",
+		"createdAt":  "createdAt",
+		"modifiedAt": "modifiedAt",
+	}, nil},
+	filterSystemLabelsTest{map[string]string{
+		"StaTus": "status",
+		"name":   "name",
+		"owner":  "owner",
+		"key":    "value",
+	}, map[string]string{
+		"StaTus": "status",
+		"key":    "value",
+	}},
+	filterSystemLabelsTest{map[string]string{
+		"key1": "value1",
+		"key2": "value2",
+	}, map[string]string{
+		"key1": "value1",
+		"key2": "value2",
+	}},
+}
+
+func TestFilterSystemLabels(t *testing.T) {
+	for _, test := range filterSystemLabelsTests {
+		if output := filterSystemLabels(test.args); !reflect.DeepEqual(test.expected, output) {
+			t.Errorf("Expected {%v}, got {%v}", test.expected, output)
+		}
+	}
+}