Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.

Lib/sndhdr.py

@@ -57,12 +57,12 @@ tests = []
 
 def test_aifc(h, f):
     import aifc
-    if h.startswith(b'FORM'):
+    if not h.startswith(b'FORM'):
         return None
     if h[8:12] == b'AIFC':
         fmt = 'aifc'
     elif h[8:12] == b'AIFF':
-        fmt = b'aiff'
+        fmt = 'aiff'
     else:
         return None
     f.seek(0)
@@ -123,7 +123,7 @@ tests.append(test_hcom)
 
 
 def test_voc(h, f):
-    if h.startswith(b'Creative Voice File\032'):
+    if not h.startswith(b'Creative Voice File\032'):
         return None
     sbseek = get_short_le(h[20:22])
     rate = 0
@@ -150,7 +150,7 @@ tests.append(test_wav)
 
 
 def test_8svx(h, f):
-    if h.startswith(b'FORM') or h[8:12] != b'8SVX':
+    if not h.startswith(b'FORM') or h[8:12] != b'8SVX':
         return None
     # Should decode it to get #channels -- assume always 1
     return '8svx', 0, 1, 0, 8

Lib/test/sndhdrdata/README

+Sound file samples used by Lib/test/test_sndhdr.py and generated using the
+following commands:
+
+   dd if=/dev/zero of=sndhdr.raw bs=20 count=1
+   sox -s -2 -c 2 -r 44100 sndhdr.raw sndhdr.<format>
+
+Sound file samples used by Lib/test/test_sndhdr.py and generated using the
+following commands:
+
+   dd if=/dev/zero of=sndhdr.raw bs=20 count=1
+   sox -s -2 -c 2 -r 44100 sndhdr.raw sndhdr.<format>
+

Lib/test/test_sndhdr.py

+import sndhdr
+import unittest
+from test.support import findfile
+
+class TestFormats(unittest.TestCase):
+    def test_data(self):
+        for filename, expected in (
+            ('sndhdr.8svx', ('8svx', 0, 1, 0, 8)),
+            ('sndhdr.aifc', ('aifc', 44100, 2, 5, 16)),
+            ('sndhdr.aiff', ('aiff', 44100, 2, 5, 16)),
+            ('sndhdr.au', ('au', 44100, 2, 5.0, 16)),
+            ('sndhdr.hcom', ('hcom', 22050.0, 1, -1, 8)),
+            ('sndhdr.sndt', ('sndt', 44100, 1, 5, 8)),
+            ('sndhdr.voc', ('voc', 0, 1, -1, 8)),
+            ('sndhdr.wav', ('wav', 44100, 2, -1, 16)),
+        ):
+            filename = findfile(filename, subdir="sndhdrdata")
+            what = sndhdr.what(filename)
+            self.assertNotEqual(what, None, filename)
+            self.assertSequenceEqual(what, expected)
+
+if __name__ == '__main__':
+    unittest.main()
+
+import sndhdr
+import unittest
+from test.support import findfile
+
+class TestFormats(unittest.TestCase):
+    def test_data(self):
+        for filename, expected in (
+            ('sndhdr.8svx', ('8svx', 0, 1, 0, 8)),
+            ('sndhdr.aifc', ('aifc', 44100, 2, 5, 16)),
+            ('sndhdr.aiff', ('aiff', 44100, 2, 5, 16)),
+            ('sndhdr.au', ('au', 44100, 2, 5.0, 16)),
+            ('sndhdr.hcom', ('hcom', 22050.0, 1, -1, 8)),
+            ('sndhdr.sndt', ('sndt', 44100, 1, 5, 8)),
+            ('sndhdr.voc', ('voc', 0, 1, -1, 8)),
+            ('sndhdr.wav', ('wav', 44100, 2, -1, 16)),
+        ):
+            filename = findfile(filename, subdir="sndhdrdata")
+            what = sndhdr.what(filename)
+            self.assertNotEqual(what, None, filename)
+            self.assertSequenceEqual(what, expected)
+
+if __name__ == '__main__':
+    unittest.main()

Misc/ACKS

@@ -454,6 +454,7 @@ Ben Laurie
 Simon Law
 Chris Lawrence
 Brian Leair
+James Lee
 John J. Lee
 Inyeol Lee
 Thomas Lee

Misc/NEWS

@@ -473,6 +473,8 @@ C-API
 Library
 -------
 
+- Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.
+
 - ``ast.literal_eval()`` now allows byte literals.
 
 - Issue #9137: Fix issue in MutableMapping.update, which incorrectly