Do not consider incompetent jobs to be killed

[blueyed]

Fixes https://github.com/sixty-north/cosmic-ray/issues/336.

[codecov-io]

Codecov Report

Merging #337 into master will decrease coverage by 0.11%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
- Coverage   83.33%   83.21%   -0.12%     
==========================================
  Files          46       46              
  Lines        1416     1418       +2     
  Branches      138      138              
==========================================
  Hits         1180     1180              
- Misses        216      218       +2     
  Partials       20       20

Flag	Coverage Δ
#py34	83.07% <0%> (-0.12%)	:arrow_down:
#py35	82.93% <0%> (-0.12%)	:arrow_down:
#py36	82.93% <0%> (-0.12%)	:arrow_down:
#pynightly	82.93% <0%> (-0.12%)	:arrow_down:

Impacted Files	Coverage Δ
cosmic_ray/reporting.py	39.06% <0%> (-1.27%)	:arrow_down:

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[blueyed]

Is this code really not covered? Or is it not picked up by pytest-cov correctly? Experimenting in https://github.com/sixty-north/cosmic-ray/pull/338, #339 and #340.

[abingham]

It may not be covered. It's definitely stuff I haven't spent a lot of testing time on.

[abingham]

One problem with this change is that the survival_rate() method needs to be updated. It needs to consider "incompetent" mutants as killed, or at least as "not survivors". I guess this points to the need for a test that generates an incompetent mutants as well (which should just be another issue).