Add test code for windows.

ipv4_windows_test.go

@@ -0,0 +1,28 @@
+// +build windows
+package water
+
+import (
+	"fmt"
+	"net"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func startBroadcast(t *testing.T, dst net.IP) {
+	if err := exec.Command("ping", "-n", "2", dst.String()).Start(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func setupIfce(t *testing.T, ipNet net.IPNet, dev string) {
+	sargs := fmt.Sprintf("interface ip set address name=REPLACE_ME source=static addr=REPLACE_ME mask=REPLACE_ME gateway=none")
+	args := strings.Split(sargs, " ")
+	args[4] = fmt.Sprintf("name=%s", dev)
+	args[6] = fmt.Sprintf("addr=%s", ipNet.IP)
+	args[7] = fmt.Sprintf("mask=%d.%d.%d.%d", ipNet.Mask[0], ipNet.Mask[1], ipNet.Mask[2], ipNet.Mask[3])
+	cmd := exec.Command("netsh", args...)
+	if err := cmd.Run(); err != nil {
+		t.Fatal(err)
+	}
+}