Method test_exception_messages

Lib/test/test_math.py:2423–2461

(self)

        self.assertRaises(TypeError, math.atan2, 1.0, 2.0, 3.0)

    def test_exception_messages(self):
        x = -1.1
        with self.assertRaisesRegex(ValueError,
                                    f"expected a nonnegative input, got {x}"):
            math.sqrt(x)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {x}"):
            math.log(x)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {x}"):
            math.log(123, x)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {x}"):
            math.log(x, 123)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {x}"):
            math.log2(x)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {x}"):
            math.log10(x)
        x = decimal.Decimal('-1.1')
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {x}"):
            math.log(x)
        x = fractions.Fraction(1, 10**400)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a positive input, got {float(x)}"):
            math.log(x)
        x = -123
        with self.assertRaisesRegex(ValueError,
                                    "expected a positive input$"):
            math.log(x)
        with self.assertRaisesRegex(ValueError,
                                    f"expected a noninteger or positive integer, got {x}"):
            math.gamma(x)
        x = 1.0
        with self.assertRaisesRegex(ValueError,
                                    f"expected a number between -1 and 1, got {x}"):
            math.atanh(x)

    # Custom assertions.