graph = bt2.Graph()
src = graph.add_component(MySource, 'src')
sink = graph.add_component(MySink, 'sink')
conn = graph.connect_ports(src.output_ports['out'], sink.input_ports['in'])
self.assertEqual(conn.downstream_port.addr, sink.input_ports['in'].addr)
graph = bt2.Graph()
src = graph.add_component(MySource, 'src')
sink = graph.add_component(MySink, 'sink')
conn = graph.connect_ports(src.output_ports['out'], sink.input_ports['in'])
self.assertEqual(conn.downstream_port.addr, sink.input_ports['in'].addr)