test: add unit test for audio adapter

fix: import issues

spleeter/audio/adapter.py

@@ -16,7 +16,7 @@ import tensorflow as tf
 from tensorflow.contrib.signal import stft, hann_window
 # pylint: enable=import-error
 
-from ..logging import get_logger
+from ..utils.logging import get_logger
 
 __email__ = 'research@deezer.com'
 __author__ = 'Deezer Research'

spleeter/audio/convertor.py

@@ -8,7 +8,7 @@ import numpy as np
 import tensorflow as tf
 # pylint: enable=import-error
 
-from ..tensor import from_float32_to_uint8, from_uint8_to_float32
+from ..utils.tensor import from_float32_to_uint8, from_uint8_to_float32
 
 __email__ = 'research@deezer.com'
 __author__ = 'Deezer Research'

spleeter/audio/ffmpeg.py

@@ -16,7 +16,7 @@ import numpy as np
 # pylint: enable=import-error
 
 from .adapter import AudioAdapter
-from ..logging import get_logger
+from ..utils.logging import get_logger
 
 __email__ = 'research@deezer.com'
 __author__ = 'Deezer Research'

tests/__init__.py

@@ -0,0 +1,4 @@
+#!/usr/bin/env python
+# coding: utf8
+
+""" TO DOCUMENT """

tests/test_ffmpeg_adapter.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+# coding: utf8
+
+""" Unit testing for audio adapter. """
+
+__email__ = 'research@deezer.com'
+__author__ = 'Deezer Research'
+__license__ = 'MIT License'
+
+from os.path import join
+from tempfile import TemporaryDirectory
+
+# pylint: disable=import-error
+from pytest import fixture
+
+import numpy as np
+import ffmpeg
+# pylint: enable=import-error
+
+from spleeter.audio.adapter import AudioAdapter
+from spleeter.audio.adapter import get_default_audio_adapter
+from spleeter.audio.adapter import get_audio_adapter
+from spleeter.audio.ffmpeg import FFMPEGProcessAudioAdapter
+
+TEST_AUDIO_DESCRIPTOR = 'audio_example.mp3'
+TEST_OFFSET = 0
+TEST_DURATION = 600.
+TEST_SAMPLE_RATE = 44100
+
+
+@fixture(scope='session')
+def adapter():
+    """ Target test audio adapter fixture. """
+    return get_default_audio_adapter()
+
+
+@fixture(scope='session')
+def audio_data(adapter):
+    """ Audio data fixture based on sample loading from adapter. """
+    return adapter.load(
+        TEST_AUDIO_DESCRIPTOR,
+        TEST_OFFSET,
+        TEST_DURATION,
+        TEST_SAMPLE_RATE)
+
+
+def test_default_adapter(adapter):
+    """ Test adapter as default adapter. """
+    assert isinstance(adapter, FFMPEGProcessAudioAdapter)
+    assert adapter is AudioAdapter.DEFAULT
+
+
+def test_load(audio_data):
+    """ Test audio loading. """
+    waveform, sample_rate = audio_data
+    assert sample_rate == TEST_SAMPLE_RATE
+    assert waveform is not None
+    assert waveform.dtype == np.dtype('float32')
+    assert len(waveform.shape) == 2
+    assert waveform.shape[0] == 479832
+    assert waveform.shape[1] == 2
+
+
+def test_save(adapter, audio_data):
+    """ Test audio saving. """
+    with TemporaryDirectory() as directory:
+        path = join(directory, 'ffmpeg-save.mp3')
+        adapter.save(
+            path,
+            audio_data[0],
+            audio_data[1])
+        probe = ffmpeg.probe(TEST_AUDIO_DESCRIPTOR)
+        assert len(probe['streams']) == 1
+        stream = probe['streams'][0]
+        assert stream['codec_type'] == 'audio'
+        assert stream['channels'] == 2
+        assert stream['duration'] == '10.919184'