test_cmath includes abs() of zeros, infinities, and real or imaginary part
NaN, but does not include a test for the magnitude conversion, which would
be triggered by something like
>>> abs(complex(2.1,3.5))
4.08166632639171
>>> abs(complex('2.1+3.5j'))
4.08166632639171

And in looking through test_cmath, it appears that only the two numeric
argument form of complex(i, j) is tested for any of the functions, not the
complex('i+nj') string form.

On Sun, Aug 14, 2016 at 1:48 PM, Ned Deily <report@bugs.python.org> wrote:

>
> Ned Deily added the comment:
>
> I think tests for abs() using complex numbers are already in test_cmath.
> How do they look?
>
> ----------
> nosy: +ned.deily
>
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> <http://bugs.python.org/issue27763>
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