bpo-37320: Remove openfp() of aifc, sunau and wave (GH-14169)

aifc.openfp() alias to aifc.open(), sunau.openfp() alias to
sunau.open(), and wave.openfp() alias to wave.open() have been
removed. They were deprecated since Python 3.7.
diff --git a/Lib/test/test_wave.py b/Lib/test/test_wave.py
index 8a42f8e4..eb231cb 100644
--- a/Lib/test/test_wave.py
+++ b/Lib/test/test_wave.py
@@ -105,9 +105,7 @@
         frames = byteswap(frames, 4)
 
 
-class MiscTestCase(audiotests.AudioMiscTests, unittest.TestCase):
-    module = wave
-
+class MiscTestCase(unittest.TestCase):
     def test__all__(self):
         blacklist = {'WAVE_FORMAT_PCM'}
         support.check__all__(self, wave, blacklist=blacklist)