diff --git a/ipv6/icmp_test.go b/ipv6/icmp_test.go
index bdde2fdb..940a7aa8 100644
--- a/ipv6/icmp_test.go
+++ b/ipv6/icmp_test.go
@@ -34,7 +34,7 @@ func TestICMPString(t *testing.T) {
 
 func TestICMPFilter(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 
@@ -61,7 +61,7 @@ func TestICMPFilter(t *testing.T) {
 
 func TestSetICMPFilter(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
diff --git a/ipv6/mocktransponder_test.go b/ipv6/mocktransponder_test.go
index 6efe56c6..1837c746 100644
--- a/ipv6/mocktransponder_test.go
+++ b/ipv6/mocktransponder_test.go
@@ -10,6 +10,7 @@ import (
 )
 
 func connector(t *testing.T, network, addr string, done chan<- bool) {
+	t.Helper()
 	defer func() { done <- true }()
 
 	c, err := net.Dial(network, addr)
@@ -21,6 +22,7 @@ func connector(t *testing.T, network, addr string, done chan<- bool) {
 }
 
 func acceptor(t *testing.T, ln net.Listener, done chan<- bool) {
+	t.Helper()
 	defer func() { done <- true }()
 
 	c, err := ln.Accept()
diff --git a/ipv6/multicast_test.go b/ipv6/multicast_test.go
index 50442c36..6ca6fd1c 100644
--- a/ipv6/multicast_test.go
+++ b/ipv6/multicast_test.go
@@ -29,7 +29,7 @@ var packetConnReadWriteMulticastUDPTests = []struct {
 
 func TestPacketConnReadWriteMulticastUDP(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -129,7 +129,7 @@ var packetConnReadWriteMulticastICMPTests = []struct {
 
 func TestPacketConnReadWriteMulticastICMP(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
diff --git a/ipv6/multicastlistener_test.go b/ipv6/multicastlistener_test.go
index 1ee0549d..91d2b1df 100644
--- a/ipv6/multicastlistener_test.go
+++ b/ipv6/multicastlistener_test.go
@@ -21,7 +21,7 @@ var udpMultipleGroupListenerTests = []net.Addr{
 
 func TestUDPSinglePacketConnWithMultipleGroupListeners(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -61,7 +61,7 @@ func TestUDPSinglePacketConnWithMultipleGroupListeners(t *testing.T) {
 
 func TestUDPMultiplePacketConnWithMultipleGroupListeners(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -116,7 +116,7 @@ func TestUDPMultiplePacketConnWithMultipleGroupListeners(t *testing.T) {
 
 func TestUDPPerInterfaceSinglePacketConnWithSingleGroupListener(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -172,7 +172,7 @@ func TestUDPPerInterfaceSinglePacketConnWithSingleGroupListener(t *testing.T) {
 
 func TestIPSinglePacketConnWithSingleGroupListener(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -216,7 +216,7 @@ func TestIPPerInterfaceSinglePacketConnWithSingleGroupListener(t *testing.T) {
 	switch runtime.GOOS {
 	case "darwin", "dragonfly", "openbsd": // platforms that return fe80::1%lo0: bind: can't assign requested address
 		t.Skipf("not supported on %s", runtime.GOOS)
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
diff --git a/ipv6/multicastsockopt_test.go b/ipv6/multicastsockopt_test.go
index 9906e876..2cb2da2d 100644
--- a/ipv6/multicastsockopt_test.go
+++ b/ipv6/multicastsockopt_test.go
@@ -26,7 +26,7 @@ var packetConnMulticastSocketOptionTests = []struct {
 
 func TestPacketConnMulticastSocketOptions(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -73,6 +73,8 @@ type testIPv6MulticastConn interface {
 }
 
 func testMulticastSocketOptions(t *testing.T, c testIPv6MulticastConn, ifi *net.Interface, grp net.Addr) {
+	t.Helper()
+
 	const hoplim = 255
 	if err := c.SetMulticastHopLimit(hoplim); err != nil {
 		t.Error(err)
@@ -111,6 +113,8 @@ func testMulticastSocketOptions(t *testing.T, c testIPv6MulticastConn, ifi *net.
 }
 
 func testSourceSpecificMulticastSocketOptions(t *testing.T, c testIPv6MulticastConn, ifi *net.Interface, grp, src net.Addr) {
+	t.Helper()
+
 	// MCAST_JOIN_GROUP -> MCAST_BLOCK_SOURCE -> MCAST_UNBLOCK_SOURCE -> MCAST_LEAVE_GROUP
 	if err := c.JoinGroup(ifi, grp); err != nil {
 		t.Error(err)
diff --git a/ipv6/readwrite_test.go b/ipv6/readwrite_test.go
index e069cf80..18d5f9d6 100644
--- a/ipv6/readwrite_test.go
+++ b/ipv6/readwrite_test.go
@@ -19,6 +19,11 @@ import (
 )
 
 func BenchmarkReadWriteUnicast(b *testing.B) {
+	switch runtime.GOOS {
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
+		b.Skipf("not supported on %s", runtime.GOOS)
+	}
+
 	c, err := nettest.NewLocalPacketListener("udp6")
 	if err != nil {
 		b.Skipf("not supported on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err)
@@ -66,7 +71,7 @@ func BenchmarkReadWriteUnicast(b *testing.B) {
 
 func BenchmarkPacketConnReadWriteUnicast(b *testing.B) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		b.Skipf("not supported on %s", runtime.GOOS)
 	}
 
@@ -213,7 +218,7 @@ func BenchmarkPacketConnReadWriteUnicast(b *testing.B) {
 
 func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -297,7 +302,7 @@ func TestPacketConnConcurrentReadWriteUnicastUDP(t *testing.T) {
 
 func TestPacketConnConcurrentReadWriteUnicast(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 
@@ -350,6 +355,8 @@ func TestPacketConnConcurrentReadWriteUnicast(t *testing.T) {
 }
 
 func testPacketConnConcurrentReadWriteUnicast(t *testing.T, p *ipv6.PacketConn, data []byte, dst net.Addr, batch bool) {
+	t.Helper()
+
 	ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
 	cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
 
diff --git a/ipv6/sockopt_test.go b/ipv6/sockopt_test.go
index add045e3..0ff911d4 100644
--- a/ipv6/sockopt_test.go
+++ b/ipv6/sockopt_test.go
@@ -19,7 +19,7 @@ var supportsIPv6 bool = nettest.SupportsIPv6()
 
 func TestConnInitiatorPathMTU(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -57,7 +57,7 @@ func TestConnInitiatorPathMTU(t *testing.T) {
 
 func TestConnResponderPathMTU(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -95,7 +95,7 @@ func TestConnResponderPathMTU(t *testing.T) {
 
 func TestPacketConnChecksum(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
diff --git a/ipv6/unicast_test.go b/ipv6/unicast_test.go
index 159bb39b..25fb4eb2 100644
--- a/ipv6/unicast_test.go
+++ b/ipv6/unicast_test.go
@@ -20,7 +20,7 @@ import (
 
 func TestPacketConnReadWriteUnicastUDP(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -78,7 +78,7 @@ func TestPacketConnReadWriteUnicastUDP(t *testing.T) {
 
 func TestPacketConnReadWriteUnicastICMP(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
diff --git a/ipv6/unicastsockopt_test.go b/ipv6/unicastsockopt_test.go
index 69adefe8..2f833736 100644
--- a/ipv6/unicastsockopt_test.go
+++ b/ipv6/unicastsockopt_test.go
@@ -16,7 +16,7 @@ import (
 
 func TestConnUnicastSocketOptions(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -61,7 +61,7 @@ var packetConnUnicastSocketOptionTests = []struct {
 
 func TestPacketConnUnicastSocketOptions(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "nacl", "plan9", "windows":
+	case "aix", "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
@@ -92,6 +92,8 @@ type testIPv6UnicastConn interface {
 }
 
 func testUnicastSocketOptions(t *testing.T, c testIPv6UnicastConn) {
+	t.Helper()
+
 	tclass := iana.DiffServCS0 | iana.NotECNTransport
 	if err := c.SetTrafficClass(tclass); err != nil {
 		switch runtime.GOOS {