Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.
diff --git a/Lib/test/sndhdrdata/README b/Lib/test/sndhdrdata/README
new file mode 100644
index 0000000..8a17c00
--- /dev/null
+++ b/Lib/test/sndhdrdata/README
@@ -0,0 +1,12 @@
+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>
+