ipv6: simplify tests and benchmarks

Change-Id: I248e5e5215960bceaba357d3d4a6e72191f955b1
Reviewed-on: https://go-review.googlesource.com/47372
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>

ipv6/readwrite_test.go

@@ -17,87 +17,50 @@ import (
 	"golang.org/x/net/ipv6"
 )
 
-func benchmarkUDPListener() (net.PacketConn, net.Addr, error) {
-	c, err := net.ListenPacket("udp6", "[::1]:0")
+func BenchmarkReadWriteUnicast(b *testing.B) {
+	c, err := nettest.NewLocalPacketListener("udp6")
 	if err != nil {
-		return nil, nil, err
-	}
-	dst, err := net.ResolveUDPAddr("udp6", c.LocalAddr().String())
-	if err != nil {
-		c.Close()
-		return nil, nil, err
-	}
-	return c, dst, nil
-}
-
-func BenchmarkReadWriteNetUDP(b *testing.B) {
-	if !supportsIPv6 {
-		b.Skip("ipv6 is not supported")
-	}
-
-	c, dst, err := benchmarkUDPListener()
-	if err != nil {
-		b.Fatal(err)
+		b.Skipf("not supported on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err)
 	}
 	defer c.Close()
 
+	dst := c.LocalAddr()
 	wb, rb := []byte("HELLO-R-U-THERE"), make([]byte, 128)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		benchmarkReadWriteNetUDP(b, c, wb, rb, dst)
-	}
-}
 
-func benchmarkReadWriteNetUDP(b *testing.B, c net.PacketConn, wb, rb []byte, dst net.Addr) {
+	b.Run("NetUDP", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
 			if _, err := c.WriteTo(wb, dst); err != nil {
 				b.Fatal(err)
 			}
 			if _, _, err := c.ReadFrom(rb); err != nil {
 				b.Fatal(err)
 			}
-}
-
-func BenchmarkReadWriteIPv6UDP(b *testing.B) {
-	if !supportsIPv6 {
-		b.Skip("ipv6 is not supported")
-	}
-
-	c, dst, err := benchmarkUDPListener()
-	if err != nil {
-		b.Fatal(err)
 		}
-	defer c.Close()
-
+	})
+	b.Run("IPv6UDP", func(b *testing.B) {
 		p := ipv6.NewPacketConn(c)
 		cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
 		if err := p.SetControlMessage(cf, true); err != nil {
 			b.Fatal(err)
 		}
-	ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
-
-	wb, rb := []byte("HELLO-R-U-THERE"), make([]byte, 128)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		benchmarkReadWriteIPv6UDP(b, p, wb, rb, dst, ifi)
-	}
-}
-
-func benchmarkReadWriteIPv6UDP(b *testing.B, p *ipv6.PacketConn, wb, rb []byte, dst net.Addr, ifi *net.Interface) {
 		cm := ipv6.ControlMessage{
 			TrafficClass: iana.DiffServAF11 | iana.CongestionExperienced,
 			HopLimit:     1,
 		}
+		ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
 		if ifi != nil {
 			cm.IfIndex = ifi.Index
 		}
-	if n, err := p.WriteTo(wb, &cm, dst); err != nil {
+
+		for i := 0; i < b.N; i++ {
+			if _, err := p.WriteTo(wb, &cm, dst); err != nil {
 				b.Fatal(err)
-	} else if n != len(wb) {
-		b.Fatalf("got %v; want %v", n, len(wb))
 			}
 			if _, _, _, err := p.ReadFrom(rb); err != nil {
 				b.Fatal(err)
 			}
+		}
+	})
 }
 
 func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
@@ -109,7 +72,7 @@ func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
 		t.Skip("ipv6 is not supported")
 	}
 
-	c, err := net.ListenPacket("udp6", "[::1]:0")
+	c, err := nettest.NewLocalPacketListener("udp6")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -117,11 +80,7 @@ func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
 	p := ipv6.NewPacketConn(c)
 	defer p.Close()
 
-	dst, err := net.ResolveUDPAddr("udp6", c.LocalAddr().String())
-	if err != nil {
-		t.Fatal(err)
-	}
-
+	dst := c.LocalAddr()
 	ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
 	cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
 	wb := []byte("HELLO-R-U-THERE")
@@ -167,7 +126,7 @@ func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
 			t.Error(err)
 			return
 		} else if n != len(wb) {
-			t.Errorf("got %v; want %v", n, len(wb))
+			t.Errorf("got %d; want %d", n, len(wb))
 			return
 		}
 	}

ipv6/unicast_test.go

@@ -27,7 +27,7 @@ func TestPacketConnReadWriteUnicastUDP(t *testing.T) {
 		t.Skip("ipv6 is not supported")
 	}
 
-	c, err := net.ListenPacket("udp6", "[::1]:0")
+	c, err := nettest.NewLocalPacketListener("udp6")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -35,11 +35,7 @@ func TestPacketConnReadWriteUnicastUDP(t *testing.T) {
 	p := ipv6.NewPacketConn(c)
 	defer p.Close()
 
-	dst, err := net.ResolveUDPAddr("udp6", c.LocalAddr().String())
-	if err != nil {
-		t.Fatal(err)
-	}
-
+	dst := c.LocalAddr()
 	cm := ipv6.ControlMessage{
 		TrafficClass: iana.DiffServAF11 | iana.CongestionExperienced,
 		Src:          net.IPv6loopback,
@@ -54,7 +50,8 @@ func TestPacketConnReadWriteUnicastUDP(t *testing.T) {
 	for i, toggle := range []bool{true, false, true} {
 		if err := p.SetControlMessage(cf, toggle); err != nil {
 			if nettest.ProtocolNotSupported(err) {
-				t.Skipf("not supported on %s", runtime.GOOS)
+				t.Logf("not supported on %s", runtime.GOOS)
+				continue
 			}
 			t.Fatal(err)
 		}
@@ -151,7 +148,8 @@ func TestPacketConnReadWriteUnicastICMP(t *testing.T) {
 		}
 		if err := p.SetControlMessage(cf, toggle); err != nil {
 			if nettest.ProtocolNotSupported(err) {
-				t.Skipf("not supported on %s", runtime.GOOS)
+				t.Logf("not supported on %s", runtime.GOOS)
+				continue
 			}
 			t.Fatal(err)
 		}