Issue #8681: Make the zlib module's error messages more informative when
the zlib itself doesn't give any detailed explanation.
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 2fc4313..cbc3ed4 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -135,6 +135,13 @@
x = zlib.compress(data)
self.assertEqual(zlib.decompress(x), data)
+ def test_incomplete_stream(self):
+ # An useful error message is given
+ x = zlib.compress(HAMLET_SCENE)
+ self.assertRaisesRegexp(zlib.error,
+ "Error -5 while decompressing data: incomplete or truncated stream",
+ zlib.decompress, x[:-1])
+
# Memory use of the following functions takes into account overallocation
@precisionbigmemtest(size=_1G + 1024 * 1024, memuse=3)