1 files changed, 89 insertions, 0 deletions
diff --git a/src/pkg/net/udp_test.go b/src/pkg/net/udp_test.go
new file mode 100644
index 000000000..f80d3b5a9
--- /dev/null
+++ b/src/pkg/net/udp_test.go
@@ -0,0 +1,89 @@
+// Copyright 2012 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 (
+	"runtime"
+	"testing"
+)
+
+func TestWriteToUDP(t *testing.T) {
+	switch runtime.GOOS {
+	case "plan9":
+		t.Logf("skipping test on %q", runtime.GOOS)
+		return
+	}
+
+	l, err := ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("Listen failed: %v", err)
+	}
+	defer l.Close()
+
+	testWriteToConn(t, l.LocalAddr().String())
+	testWriteToPacketConn(t, l.LocalAddr().String())
+}
+
+func testWriteToConn(t *testing.T, raddr string) {
+	c, err := Dial("udp", raddr)
+	if err != nil {
+		t.Fatalf("Dial failed: %v", err)
+	}
+	defer c.Close()
+
+	ra, err := ResolveUDPAddr("udp", raddr)
+	if err != nil {
+		t.Fatalf("ResolveUDPAddr failed: %v", err)
+	}
+
+	_, err = c.(*UDPConn).WriteToUDP([]byte("Connection-oriented mode socket"), ra)
+	if err == nil {
+		t.Fatal("WriteToUDP should fail")
+	}
+	if err != nil && err.(*OpError).Err != ErrWriteToConnected {
+		t.Fatalf("WriteToUDP should fail as ErrWriteToConnected: %v", err)
+	}
+
+	_, err = c.(*UDPConn).WriteTo([]byte("Connection-oriented mode socket"), ra)
+	if err == nil {
+		t.Fatal("WriteTo should fail")
+	}
+	if err != nil && err.(*OpError).Err != ErrWriteToConnected {
+		t.Fatalf("WriteTo should fail as ErrWriteToConnected: %v", err)
+	}
+
+	_, err = c.Write([]byte("Connection-oriented mode socket"))
+	if err != nil {
+		t.Fatalf("Write failed: %v", err)
+	}
+}
+
+func testWriteToPacketConn(t *testing.T, raddr string) {
+	c, err := ListenPacket("udp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("ListenPacket failed: %v", err)
+	}
+	defer c.Close()
+
+	ra, err := ResolveUDPAddr("udp", raddr)
+	if err != nil {
+		t.Fatalf("ResolveUDPAddr failed: %v", err)
+	}
+
+	_, err = c.(*UDPConn).WriteToUDP([]byte("Connection-less mode socket"), ra)
+	if err != nil {
+		t.Fatalf("WriteToUDP failed: %v", err)
+	}
+
+	_, err = c.WriteTo([]byte("Connection-less mode socket"), ra)
+	if err != nil {
+		t.Fatalf("WriteTo failed: %v", err)
+	}
+
+	_, err = c.(*UDPConn).Write([]byte("Connection-less mode socket"))
+	if err == nil {
+		t.Fatal("Write should fail")
+	}
+}