1 files changed, 12 insertions, 0 deletions
diff --git a/libgo/go/net/lookup_test.go b/libgo/go/net/lookup_test.go
index 3a61dfb29c2c..84f089e86970 100644
--- a/libgo/go/net/lookup_test.go
+++ b/libgo/go/net/lookup_test.go
@@ -9,6 +9,7 @@ package net
 
 import (
 	"flag"
+	"strings"
 	"testing"
 )
 
@@ -79,6 +80,17 @@ func TestGoogleDNSAddr(t *testing.T) {
 	}
 }
 
+func TestLookupIANACNAME(t *testing.T) {
+	if testing.Short() || !*testExternal {
+		t.Logf("skipping test to avoid external network")
+		return
+	}
+	cname, err := LookupCNAME("www.iana.org")
+	if !strings.HasSuffix(cname, ".icann.org.") || err != nil {
+		t.Errorf(`LookupCNAME("www.iana.org.") = %q, %v, want "*.icann.org.", nil`, cname, err)
+	}
+}
+
 var revAddrTests = []struct {
 	Addr      string
 	Reverse   string