1 files changed, 83 insertions, 0 deletions
diff --git a/src/net/dnsname_test.go b/src/net/dnsname_test.go
new file mode 100644
index 000000000..57dd25fe4
--- /dev/null
+++ b/src/net/dnsname_test.go
@@ -0,0 +1,83 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"strings"
+	"testing"
+)
+
+type testCase struct {
+	name   string
+	result bool
+}
+
+var tests = []testCase{
+	// RFC2181, section 11.
+	{"_xmpp-server._tcp.google.com", true},
+	{"foo.com", true},
+	{"1foo.com", true},
+	{"26.0.0.73.com", true},
+	{"fo-o.com", true},
+	{"fo1o.com", true},
+	{"foo1.com", true},
+	{"a.b..com", false},
+	{"a.b-.com", false},
+	{"a.b.com-", false},
+	{"a.b..", false},
+	{"b.com.", true},
+}
+
+func getTestCases(ch chan<- testCase) {
+	defer close(ch)
+	var char59 = ""
+	var char63 = ""
+	var char64 = ""
+	for i := 0; i < 59; i++ {
+		char59 += "a"
+	}
+	char63 = char59 + "aaaa"
+	char64 = char63 + "a"
+
+	for _, tc := range tests {
+		ch <- tc
+	}
+
+	ch <- testCase{char63 + ".com", true}
+	ch <- testCase{char64 + ".com", false}
+	// 255 char name is fine:
+	ch <- testCase{char59 + "." + char63 + "." + char63 + "." +
+		char63 + ".com",
+		true}
+	// 256 char name is bad:
+	ch <- testCase{char59 + "a." + char63 + "." + char63 + "." +
+		char63 + ".com",
+		false}
+}
+
+func TestDNSNames(t *testing.T) {
+	ch := make(chan testCase)
+	go getTestCases(ch)
+	for tc := range ch {
+		if isDomainName(tc.name) != tc.result {
+			t.Errorf("isDomainName(%v) failed: Should be %v",
+				tc.name, tc.result)
+		}
+	}
+}
+
+func BenchmarkDNSNames(b *testing.B) {
+	benchmarks := append(tests, []testCase{
+		{strings.Repeat("a", 63), true},
+		{strings.Repeat("a", 64), false},
+	}...)
+	for n := 0; n < b.N; n++ {
+		for _, tc := range benchmarks {
+			if isDomainName(tc.name) != tc.result {
+				b.Errorf("isDomainName(%q) = %v; want %v", tc.name, !tc.result, tc.result)
+			}
+		}
+	}
+}