Closes #12291: Fixed bug which was found when doing multiple loads from one stream.
diff --git a/Lib/test/test_marshal.py b/Lib/test/test_marshal.py
index 81cf598..cd100f9 100644
--- a/Lib/test/test_marshal.py
+++ b/Lib/test/test_marshal.py
@@ -211,6 +211,30 @@
invalid_string = b'l\x02\x00\x00\x00\x00\x00\x00\x00'
self.assertRaises(ValueError, marshal.loads, invalid_string)
+ def test_multiple_dumps_and_loads(self):
+ # Issue 12291: marshal.load() should be callable multiple times
+ # with interleaved data written by non-marshal code
+ # Adapted from a patch by Engelbert Gruber.
+ data = (1, 'abc', b'def', 1.0, (2, 'a', ['b', b'c']))
+ for interleaved in (b'', b'0123'):
+ ilen = len(interleaved)
+ positions = []
+ try:
+ with open(support.TESTFN, 'wb') as f:
+ for d in data:
+ marshal.dump(d, f)
+ if ilen:
+ f.write(interleaved)
+ positions.append(f.tell())
+ with open(support.TESTFN, 'rb') as f:
+ for i, d in enumerate(data):
+ self.assertEqual(d, marshal.load(f))
+ if ilen:
+ f.read(ilen)
+ self.assertEqual(positions[i], f.tell())
+ finally:
+ support.unlink(support.TESTFN)
+
def test_main():
support.run_unittest(IntTestCase,