start adding tests for lan related functions in network package

includes required imports and two helper functions to build reusable
fresh-starts to be used in functions

network/lan_test.go

@@ -0,0 +1,27 @@
+package network
+
+import (
+	"net"
+	"testing"
+)
+
+func buildExampleLAN() *LAN {
+	iface, _ := FindInterface("")
+	gateway, _ := FindGateway(iface)
+	exNewCallback := func(e *Endpoint) {}
+	exLostCallback := func(e *Endpoint) {}
+	return NewLAN(iface, gateway, exNewCallback, exLostCallback)
+}
+
+func buildExampleEndpoint() *Endpoint {
+	ifaces, _ := net.Interfaces()
+	var exampleIface net.Interface
+	for _, iface := range ifaces {
+		if iface.HardwareAddr != nil {
+			exampleIface = iface
+			break
+		}
+	}
+	foundEndpoint, _ := FindInterface(exampleIface.Name)
+	return foundEndpoint
+}