Method check

Lib/test/test_decimal.py:821–824

(arg, expected)

            cls = Decimal

        def check(arg, expected):
            d = cls.from_number(arg)
            self.assertIs(type(d), cls)
            self.assertEqual(d, expected)

        check(314, Decimal(314))
        check(3.14, Decimal.from_float(3.14))