I picked the value from the error message:

======================================================================
FAIL: test_ucs2_string (test.test_hash.StrHashRandomizationTests)
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Traceback (most recent call last):
  File "/home/cpython/buildslave/cc-64/3.x.snakebite-sol10-sparc-cc-64/build/Lib/test/test_hash.py", line 292, in test_ucs2_string
    self.assertEqual(self.get_hash(self.repr_ucs2, seed=42), h)
AssertionError: -3927695501187247084 != None