run tests again

[vincentqb]

As noted here, tests were not running, when invoking through python test.py.

cc @mthrok

[vincentqb]

On GPU:

❯ python test_torchscript_consistency.py

Run test with cuda: True
................................E..........F.
======================================================================
ERROR: test_Fade (__main__.TestTransforms)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_torchscript_consistency.py", line 394, in test_Fade
    _test_script_module(torchaudio.transforms.Fade, waveform, fade_in_len, fade_out_len)
  File "test_torchscript_consistency.py", line 328, in _test_script_module
    py_out = py_method(tensor)
  File "/private/home/vincentqb/anaconda3/envs/audio-built/lib/python3.7/site-packages/torch/nn/modules/module.py", line 532, in __call__
    result = self.forward(*input, **kwargs)
  File "/private/home/vincentqb/anaconda3/envs/audio-built/lib/python3.7/site-packages/torchaudio-0.5.0a0+4875007-py3.7-linux-x86_64.egg/torchaudio/transforms.py", line 727, in forward
    return self._fade_in(waveform_length) * self._fade_out(waveform_length) * waveform
RuntimeError: expected device cpu but got device cuda:0

======================================================================
FAIL: test_TimeStretch (__main__.TestTransforms)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_torchscript_consistency.py", line 385, in test_TimeStretch
    tensor, n_freq=n_freq, hop_length=hop_length, fixed_rate=fixed_rate)
  File "test_torchscript_consistency.py", line 331, in _test_script_module
    assert torch.allclose(jit_out, py_out)
AssertionError

----------------------------------------------------------------------
Ran 45 tests in 253.642s

FAILED (failures=1, errors=1)

[vincentqb]

Self-approving PR.

[mthrok]

FYI: The way tests are invoked is python -m pytest <script>, tests were running in CI as intended. unittest.main is only required when running test script directly with python, but that does not work with tests written in pytest (test_functional.py)