fix test_stream

aplay/arecord should not be tested

tests/test_stream.py

@@ -1,13 +1,26 @@
 from amodem import stream
-from amodem import wave
+import subprocess as sp
+
+script = r"""
+import sys
+import time
+import os
+
+while True:
+    time.sleep(0.1)
+    sys.stdout.write(b'\x00' * 6400)
+    sys.stderr.write('.')
+"""
 
 
-def test():
+def test_read():
-    p = wave.record('-', stdout=wave.sp.PIPE)
+    p = sp.Popen(args=['python', '-'], stdin=sp.PIPE, stdout=sp.PIPE)
+    p.stdin.write(script)
+    p.stdin.close()
     f = stream.Reader(p.stdout)
 
     result = zip(range(10), f)
-    p.stop()
+    p.kill()
 
     j = 0
     for i, buf in result: