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-rw-r--r--Lib/test/test_zlib.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 7593c06..f991900 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -350,6 +350,15 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
self.assertRaises(ValueError, dco.decompress, b"", -1)
self.assertEqual(b'', dco.unconsumed_tail)
+ def test_clear_unconsumed_tail(self):
+ # Issue #12050: calling decompress() without providing max_length
+ # should clear the unconsumed_tail attribute.
+ cdata = b"x\x9cKLJ\x06\x00\x02M\x01" # "abc"
+ dco = zlib.decompressobj()
+ ddata = dco.decompress(cdata, 1)
+ ddata += dco.decompress(dco.unconsumed_tail)
+ self.assertEqual(dco.unconsumed_tail, b"")
+
def test_flushes(self):
# Test flush() with the various options, using all the
# different levels in order to provide more variations.