Test gmpy2 root and rootn
=========================

>>> import gmpy2 as gmpy2
>>> from gmpy2 import root, rootn, zero

>>> root(zero(1), 2)
mpfr('0.0')

>>> root(zero(-1), 2)
mpfr('-0.0')
>>> root(zero(-1), 3)
mpfr('-0.0')
>>> root(zero(-1), 4)
mpfr('-0.0')
>>> root(zero(-1), 5)
mpfr('-0.0')
>>> root(zero(-1), 6)
mpfr('-0.0')

>>> rootn(zero(1), 2)
mpfr('0.0')

>>> rootn(zero(-1), 2)
mpfr('0.0')
>>> rootn(zero(-1), 3)
mpfr('-0.0')
>>> rootn(zero(-1), 4)
mpfr('0.0')
>>> rootn(zero(-1), 5)
mpfr('-0.0')
>>> rootn(zero(-1), 6)
mpfr('0.0')

