Introduce a FieldPath type for validation

pkg/util/validation/fieldpath_test.go

@@ -0,0 +1,123 @@
+/*
+Copyright 2015 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 validation
+
+import "testing"
+
+func TestFieldPath(t *testing.T) {
+	testCases := []struct {
+		op       func(*FieldPath) *FieldPath
+		expected string
+	}{
+		{
+			func(fp *FieldPath) *FieldPath { return fp },
+			"root",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Child("first") },
+			"root.first",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Child("second") },
+			"root.first.second",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Index(0) },
+			"root.first.second[0]",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Child("third") },
+			"root.first.second[0].third",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Index(93) },
+			"root.first.second[0].third[93]",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.parent },
+			"root.first.second[0].third",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.parent },
+			"root.first.second[0]",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Key("key") },
+			"root.first.second[0][key]",
+		},
+	}
+
+	root := NewFieldPath("root")
+	fp := root
+	for i, tc := range testCases {
+		fp = tc.op(fp)
+		if fp.String() != tc.expected {
+			t.Errorf("[%d] Expected %q, got %q", i, tc.expected, fp.String())
+		}
+		if fp.Root() != root {
+			t.Errorf("[%d] Wrong root: %#v", i, fp.Root())
+		}
+	}
+}
+
+func TestFieldPathMultiArg(t *testing.T) {
+	testCases := []struct {
+		op       func(*FieldPath) *FieldPath
+		expected string
+	}{
+		{
+			func(fp *FieldPath) *FieldPath { return fp },
+			"root.first",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Child("second", "third") },
+			"root.first.second.third",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.Index(0) },
+			"root.first.second.third[0]",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.parent },
+			"root.first.second.third",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.parent },
+			"root.first.second",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.parent },
+			"root.first",
+		},
+		{
+			func(fp *FieldPath) *FieldPath { return fp.parent },
+			"root",
+		},
+	}
+
+	root := NewFieldPath("root", "first")
+	fp := root
+	for i, tc := range testCases {
+		fp = tc.op(fp)
+		if fp.String() != tc.expected {
+			t.Errorf("[%d] Expected %q, got %q", i, tc.expected, fp.String())
+		}
+		if fp.Root() != root.Root() {
+			t.Errorf("[%d] Wrong root: %#v", i, fp.Root())
+		}
+	}
+}