diff options
Diffstat (limited to 'Lib/test/test_statistics.py')
| -rw-r--r-- | Lib/test/test_statistics.py | 29 |
1 files changed, 5 insertions, 24 deletions
diff --git a/Lib/test/test_statistics.py b/Lib/test/test_statistics.py index dff0cd4476..9443ff0c61 100644 --- a/Lib/test/test_statistics.py +++ b/Lib/test/test_statistics.py @@ -1095,13 +1095,6 @@ class Test_Nth_Root(NumericTestCase): with self.subTest(n=n, inf=INF): self.assertEqual(self.nroot(INF, n), INF) - def testNInf(self): - # Test that the root of -inf is -inf for odd n. - for NINF in (float('-inf'), decimal.Decimal('-inf')): - for n in range(3, 11, 2): - with self.subTest(n=n, inf=NINF): - self.assertEqual(self.nroot(NINF, n), NINF) - # FIXME: need to check Decimal zeroes too. def test_zero(self): # Test that the root of +0.0 is +0.0. @@ -1157,13 +1150,15 @@ class Test_Nth_Root(NumericTestCase): with self.subTest(x=x): self.assertRaises(TypeError, self.nroot, x, 3) - def testNegativeEvenPower(self): - # Test negative x with even n raises correctly. + def testNegativeError(self): + # Test negative x raises correctly. x = random.uniform(-20.0, -0.1) assert x < 0 - for n in range(2, 9, 2): + for n in range(3, 7): with self.subTest(x=x, n=n): self.assertRaises(ValueError, self.nroot, x, n) + # And Decimal. + self.assertRaises(ValueError, self.nroot, Decimal(-27), 3) # --- Test that nroot is never worse than calling math.pow() --- @@ -1216,25 +1211,11 @@ class Test_Nth_Root(NumericTestCase): x = i**n self.assertEqual(self.nroot(x, n), i) - def testExactPowersNegatives(self): - # Test that small negative integer powers are calculated exactly. - for i in range(-1, -51, -1): - for n in range(3, 16, 2): - if (i, n) == (-35, 13): - # See testExpectedFailure35p13 - continue - with self.subTest(i=i, n=n): - x = i**n - assert sign(x) == -1 - self.assertEqual(self.nroot(x, n), i) - def testExpectedFailure35p13(self): # Test the expected failure 35**13 is almost exact. x = 35**13 err = abs(self.nroot(x, 13) - 35) self.assertLessEqual(err, 0.000000001) - err = abs(self.nroot(-x, 13) + 35) - self.assertLessEqual(err, 0.000000001) def testOne(self): # Test that the root of 1.0 is 1.0. |