def METHOD_NAME(self):
    self.__change_project()
    curr = self.proj.conn.cursor()
    zones = self.proj.zoning
    zone1 = zones.get(1)
    zone1.add_centroid(None)
    zone1.connect_mode("c")
    zone1.connect_mode("w")
    curr.execute("""select COUNT(*) from links where a_node=1""")
    tot = curr.fetchone()[0]
    curr.execute("""Update links set modes = modes || 'w' where instr(modes,'w')=0""")
    self.proj.conn.commit()
    zone1.disconnect_mode("w")
    curr.execute("""select COUNT(*) from links where a_node=1""")
    self.assertIsNot(tot, curr.fetchone()[0], "failed to delete links")
    curr.execute("""Select count(*) from links where a_node=1 and instr(modes,'w')>0""")
    self.assertEqual(curr.fetchone()[0], 0, "Failed to remove mode from all connectors")