Function test_boundaries

Modules/_decimal/tests/randfloat.py:81–100

()

            yield s

def test_boundaries():
    # boundaries expressed as triples (n, e, u), where
    # n*10**e is an approximation to the boundary value and
    # u*10**e is 1ulp
    boundaries = [
        (10000000000000000000, -19, 1110),   # a power of 2 boundary (1.0)
        (17976931348623159077, 289, 1995),   # overflow boundary (2.**1024)
        (22250738585072013831, -327, 4941),  # normal/subnormal (2.**-1022)
        (0, -327, 4941),                     # zero
        ]
    for n, e, u in boundaries:
        for j in range(1000):
            for i in range(TEST_SIZE):
                digits = n + random.randrange(-3*u, 3*u)
                exponent = e
                s = '{}e{}'.format(digits, exponent)
                yield s
            n *= 10
            u *= 10
            e -= 1

def test_underflow_boundary():
    # test values close to 2**-1075, the underflow boundary; similar