Prep for real tests like alltoall.

testnet/TestEthernetTapFactory.cpp

@@ -57,6 +57,10 @@ EthernetTap *TestEthernetTapFactory::open(
 		Mutex::Lock _l(_tapsByMac_m);
 		_tapsByMac[mac] = tap;
 	}
+	{
+		Mutex::Lock _l(_tapsByNwid_m);
+		_tapsByNwid[nwid] = tap;
+	}
 	return tap.ptr();
 }
 
@@ -73,6 +77,10 @@ void TestEthernetTapFactory::close(EthernetTap *tap,bool destroyPersistentDevice
 		Mutex::Lock _l(_tapsByMac_m);
 		_tapsByMac.erase(tapp->mac());
 	}
+	{
+		Mutex::Lock _l(_tapsByNwid_m);
+		_tapsByNwid.erase(tapp->nwid());
+	}
 }
 
 } // namespace ZeroTier