Convert test_ossaudiodev to use unittest.

Lib/test/test_ossaudiodev.py

 from test import test_support
 test_support.requires('audio')
 
-from test.test_support import verbose, findfile, TestFailed, TestSkipped
+from test.test_support import verbose, findfile, TestSkipped
 
 import errno
 import fcntl
@@ -12,6 +12,7 @@ import select
 import sunaudio
 import time
 import audioop
+import unittest
 
 # Arggh, AFMT_S16_NE not defined on all platforms -- seems to be a
 # fairly recent addition to OSS.
@@ -33,25 +34,21 @@ def read_sound_file(path):
     fp.close()
 
     if enc != SND_FORMAT_MULAW_8:
-        print "Expect .au file with 8-bit mu-law samples"
-        return
+        raise RuntimeError("Expect .au file with 8-bit mu-law samples")
 
     # Convert the data to 16-bit signed.
     data = audioop.ulaw2lin(data, 2)
     return (data, rate, 16, nchannels)
 
-# version of assert that still works with -O
-def _assert(expr, message=None):
-    if not expr:
-        raise AssertionError(message or "assertion failed")
+class OSSAudioDevTests(unittest.TestCase):
 
-def play_sound_file(data, rate, ssize, nchannels):
+    def play_sound_file(self, data, rate, ssize, nchannels):
         try:
             dsp = ossaudiodev.open('w')
         except IOError, msg:
             if msg[0] in (errno.EACCES, errno.ENOENT, errno.ENODEV, errno.EBUSY):
-            raise TestSkipped, msg
-        raise TestFailed, msg
+                raise TestSkipped(msg)
+            raise
 
         # at least check that these methods can be invoked
         dsp.bufsize()
@@ -61,17 +58,18 @@ def play_sound_file(data, rate, ssize, nchannels):
         dsp.fileno()
 
         # Make sure the read-only attributes work.
-    _assert(dsp.closed is False, "dsp.closed is not False")
-    _assert(dsp.name == "/dev/dsp")
-    _assert(dsp.mode == 'w', "bad dsp.mode: %r" % dsp.mode)
+        self.failUnless(dsp.close)
+        self.assertEqual(dsp.name, "/dev/dsp")
+        self.assertEqual(dsp.mode, "w", "bad dsp.mode: %r" % dsp.mode)
 
         # And make sure they're really read-only.
         for attr in ('closed', 'name', 'mode'):
             try:
                 setattr(dsp, attr, 42)
-            raise RuntimeError("dsp.%s not read-only" % attr)
             except TypeError:
                 pass
+            else:
+                self.fail("dsp.%s not read-only" % attr)
 
         # Compute expected running time of sound sample (in seconds).
         expected_time = float(len(data)) / (ssize/8) / nchannels / rate
@@ -87,11 +85,10 @@ def play_sound_file(data, rate, ssize, nchannels):
         elapsed_time = t2 - t1
 
         percent_diff = (abs(elapsed_time - expected_time) / expected_time) * 100
-    _assert(percent_diff <= 10.0, \
-            ("elapsed time (%.2f sec) > 10%% off of expected time (%.2f sec)"
-             % (elapsed_time, expected_time)))
+        self.failUnless(percent_diff <= 10.0,
+                        "elapsed time > 10% off of expected time")
 
-def test_setparameters(dsp):
+    def set_parameters(self, dsp):
         # Two configurations for testing:
         #   config1 (8-bit, mono, 8 kHz) should work on even the most
         #      ancient and crufty sound card, but maybe not on special-
@@ -114,13 +111,14 @@ def test_setparameters(dsp):
         # setparameters() should be able to set this configuration in
         # either strict or non-strict mode.
         result = dsp.setparameters(fmt, channels, rate, False)
-    _assert(result == (fmt, channels, rate),
+        self.assertEqual(result, (fmt, channels, rate),
                          "setparameters%r: returned %r" % (config, result))
+
         result = dsp.setparameters(fmt, channels, rate, True)
-    _assert(result == (fmt, channels, rate),
+        self.assertEqual(result, (fmt, channels, rate),
                          "setparameters%r: returned %r" % (config, result))
 
-def test_bad_setparameters(dsp):
+    def set_bad_parameters(self, dsp):
 
         # Now try some configurations that are presumably bogus: eg. 300
         # channels currently exceeds even Hollywood's ambitions, and
@@ -136,28 +134,35 @@ def test_bad_setparameters(dsp):
                       ]:
             (fmt, channels, rate) = config
             result = dsp.setparameters(fmt, channels, rate, False)
-        _assert(result != config,
-                "setparameters: unexpectedly got requested configuration")
+            self.failIfEqual(result, config,
+                             "unexpectedly got requested configuration")
 
             try:
                 result = dsp.setparameters(fmt, channels, rate, True)
-            raise AssertionError("setparameters: expected OSSAudioError")
             except ossaudiodev.OSSAudioError, err:
-            print "setparameters: got OSSAudioError as expected"
+                pass
+            else:
+                self.fail("expected OSSAudioError")
 
-def test():
-    (data, rate, ssize, nchannels) = read_sound_file(findfile('audiotest.au'))
-    play_sound_file(data, rate, ssize, nchannels)
+    def test_playback(self):
+        sound_info = read_sound_file(findfile('audiotest.au'))
+        self.play_sound_file(*sound_info)
 
+    def test_set_parameters(self):
         dsp = ossaudiodev.open("w")
         try:
-        test_setparameters(dsp)
+            self.set_parameters(dsp)
 
             # Disabled because it fails under Linux 2.6 with ALSA's OSS
             # emulation layer.
-        #test_bad_setparameters(dsp)
+            #self.set_bad_parameters(dsp)
         finally:
             dsp.close()
-        _assert(dsp.closed is True, "dsp.closed is not True")
+            self.failUnless(dsp.closed)
+
+
+def test_main():
+    test_support.run_unittest(__name__)
 
-test()
+if __name__ == "__main__":
+    test_main()