Method test_fma_nan_results

Lib/test/test_math.py:2697–2709

(self)

    """ Tests for math.fma. """

    def test_fma_nan_results(self):
        # Selected representative values.
        values = [
            -math.inf, -1e300, -2.3, -1e-300, -0.0,
            0.0, 1e-300, 2.3, 1e300, math.inf, math.nan
        ]

        # If any input is a NaN, the result should be a NaN, too.
        for a, b in itertools.product(values, repeat=2):
            with self.subTest(a=a, b=b):
                self.assertIsNaN(math.fma(math.nan, a, b))
                self.assertIsNaN(math.fma(a, math.nan, b))
                self.assertIsNaN(math.fma(a, b, math.nan))

    def test_fma_infinities(self):
        # Cases involving infinite inputs or results.