manifest: add test for long hashes

Differential Revision: https://phab.mercurial-scm.org/D8373

tests/test-manifest.py

@@ -88,6 +88,10 b' class basemanifesttests(object):'
         with self.assertRaises(KeyError):
             m[b'wat']
 
+    def testManifestLongHashes(self):
+        m = self.parsemanifest(b'a\0' + b'f' * 64 + b'\n')
+        self.assertEqual(binascii.unhexlify(b'f' * 64), m[b'a'])
+
     def testSetItem(self):
         want = BIN_HASH_1