def test_no_call_signal_transferring_to_underlying_fileobj(self):
underlying_stream = mock.Mock(io.RawIOBase)
underlying_stream.tell.return_value = 0
chunk = ReadFileChunk(underlying_stream, 3, 3)
try:
chunk.signal_transferring()
except AttributeError:
self.fail(
'The stream should not have tried to call signal_transferring '
'to the underlying stream.')
def test_signal_transferring_to_underlying_fileobj(self):
underlying_stream = mock.Mock()
underlying_stream.tell.return_value = 0
chunk = ReadFileChunk(underlying_stream, 3, 3)
chunk.signal_transferring()
self.assertTrue(underlying_stream.signal_transferring.called)