more test; change in API for tunnels

sample-api.py

@@ -21,7 +21,8 @@ print "Nodes started with pids: %d and %d" % (a.pid, b.pid)
 # interface object maps to a veth pair with one end in a netns
 if0 = a.add_if(mac_address = '42:71:e0:90:ca:42')
 if1 = b.add_if(mtu = 1492)
-if2 = b.add_tunnel_if() # tun device, for connecting to the outside world
+# for using with a tun device, to connect to the outside world
+if2 = b.import_if('tun0')
 
 # each Link is a linux bridge, all the parameters are applied to the associated
 # interfaces as tc qdiscs.

t/interfaces.py

@@ -9,7 +9,24 @@ class TestInterfaces(unittest.TestCase):
 #    def setUp(self):
 #        pass
     def test_interfaces(self):
-        pass
+        node0 = netns.Node()
+        if0 = a.add_if(mac_address = '42:71:e0:90:ca:42', mtu = 1492)
+        self.assertEquals(if0.mac_address, '42:71:e0:90:ca:42')
+        if0.mac_address = '4271E090CA42'
+        self.assertEquals(if0.mac_address, '42:71:e0:90:ca:42')
+        self.assertRaises(BaseException, setattr, if0, 'mac_address', 'foo')
+        self.assertRaises(BaseException, setattr, if0, 'mac_address',
+                '12345678901')
+        self.assertEquals(if0.mtu, 1492)
+        self.assertRaises(BaseException, setattr, if0, 'mtu', 0)
+        self.assertRaises(BaseException, setattr, if0, 'mtu', 65537)
+
+        # FIXME: run-time tests
+
+        dummyname = "dummy%d" % os.getpid()
+        self.assertEquals(
+                os.system("ip link add name %s type dummy" % dummyname), 0)
+        if1 = a.import_if(dummyname)
 
 if __name__ == '__main__':
     unittest.main()