'Verify that the dataReceived() callback writes the data to
the connection object\'s buffer and calls handle_read().'

def test_receiving_data(self):

    self.obj_ut.makeConnection(self.tr)
    self.obj_ut.dataReceived('foobar')
    self.assertTrue(self.mock_connection.handle_read.called)
    self.mock_connection._iobuf.write.assert_called_with('foobar')
