diff options
Diffstat (limited to 'Lib/test/test_random.py')
| -rw-r--r-- | Lib/test/test_random.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py index 78909dd96e..48077fb5db 100644 --- a/Lib/test/test_random.py +++ b/Lib/test/test_random.py @@ -423,6 +423,7 @@ class MersenneTwister_TestBasicOps(TestBasicOps, unittest.TestCase): self.assertRaises(ValueError, self.gen.setstate, (1, None, None)) def test_setstate_middle_arg(self): + start_state = self.gen.getstate() # Wrong type, s/b tuple self.assertRaises(TypeError, self.gen.setstate, (2, None, None)) # Wrong length, s/b 625 @@ -436,6 +437,10 @@ class MersenneTwister_TestBasicOps(TestBasicOps, unittest.TestCase): self.gen.setstate((2, (1,)*624+(625,), None)) with self.assertRaises((ValueError, OverflowError)): self.gen.setstate((2, (1,)*624+(-1,), None)) + # Failed calls to setstate() should not have changed the state. + bits100 = self.gen.getrandbits(100) + self.gen.setstate(start_state) + self.assertEqual(self.gen.getrandbits(100), bits100) # Little trick to make "tuple(x % (2**32) for x in internalstate)" # raise ValueError. I cannot think of a simple way to achieve this, so |