Method test_nan

Lib/test/test_statistics.py:780–788

(self)

        self.assertEqual(statistics._exact_ratio(-inf), (-inf, None))

    def test_nan(self):
        # Test that NANs are handled correctly.
        for nan in (Decimal('NAN'), Decimal('sNAN')):
            num, den = statistics._exact_ratio(nan)
            # Because NANs always compare non-equal, we cannot use assertEqual.
            # Nor can we use an identity test, as we don't guarantee anything
            # about the object identity.
            self.assertTrue(_nan_equal(num, nan))
            self.assertIs(den, None)

    def test_sign(self):
        # Test sign is calculated correctly.