The usual.

Lib/dos-8x3/test_wav.py

@@ -0,0 +1,34 @@
+from test_support import TestFailed
+import os, tempfile
+import wave
+
+def check(t, msg=None):
+    if not t:
+        raise TestFailed, msg
+
+nchannels = 2
+sampwidth = 2
+framerate = 8000
+nframes = 100
+
+testfile = tempfile.mktemp()
+
+f = wave.open(testfile, 'w')
+f.setnchannels(nchannels)
+f.setsampwidth(sampwidth)
+f.setframerate(framerate)
+f.setnframes(nframes)
+output = '\0' * nframes * nchannels * sampwidth
+f.writeframes(output)
+f.close()
+
+f = wave.open(testfile, 'r')
+check(nchannels == f.getnchannels(), "nchannels")
+check(sampwidth == f.getsampwidth(), "sampwidth")
+check(framerate == f.getframerate(), "framerate")
+check(nframes == f.getnframes(), "nframes")
+input = f.readframes(nframes)
+check(input == output, "data")
+f.close()
+
+os.remove(testfile)