switch to PyAudio package for portability

tests/test_audio.py

@@ -1,32 +1,33 @@
 from amodem import audio
-import subprocess as sp
-import signal
+from amodem import config
+
+import mock
 
 
-def test_launch():
-    p = audio.ALSA(tool='true', Fs=32000).launch()
-    assert p.wait() == 0
+def test_pyaudio_mock():
+    m = mock.Mock()
+    m.paInt16 = 8
+    m.PyAudio.return_value = m
+    m.open.return_value = m
 
+    cfg = config.fastest()
+    interface = audio.Interface(config=cfg, library=m)
+    recorder = interface.recorder()
+    n = 1024
+    data = recorder.read(n)
 
-def test_exit():
-    p = audio.ALSA(tool='python', Fs=32000).launch(fname='-', stdin=sp.PIPE)
-    s = b'import sys; sys.exit(42)'
-    p.stdin.write(s)
-    p.stdin.close()
-    assert p.wait() == 42
+    data = '\x00' * n
+    player = interface.player()
+    player.write(data)
 
-
-def test_io():
-    p = audio.ALSA(tool='python', Fs=32000)
-    p = p.launch(fname='-', stdin=sp.PIPE, stdout=sp.PIPE)
-    s = b'Hello World!'
-    p.stdin.write(b'print("' + s + b'")\n')
-    p.stdin.close()
-    assert p.stdout.read(len(s)) == s
-
-
-def test_kill():
-    p = audio.ALSA(tool='python', Fs=32000)
-    p = p.launch(fname='-', stdin=sp.PIPE, stdout=sp.PIPE)
-    p.kill()
-    assert p.wait() == -signal.SIGKILL
+    kwargs = dict(
+        channels=1, frames_per_buffer=cfg.samples_per_buffer,
+        rate=cfg.Fs, format=m.paInt16
+    )
+    assert m.mock_calls == [
+        mock.call.PyAudio(),
+        mock.call.open(input=True, **kwargs),
+        mock.call.read(n // cfg.sample_size),
+        mock.call.open(output=True, **kwargs),
+        mock.call.write(data)
+    ]