Add __repr__ for RunResult

[blueyed]

TODO:

• test

[blueyed]

len appears to be 1 always (empty line(s)), but appears to be ok?!

[nicoddemus]

I guess that's fine. 👍

[blueyed]

Added a test.

[codecov]

Codecov Report

Merging #4652 into features will increase coverage by 0.16%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##           features    #4652      +/-   ##
============================================
+ Coverage     95.57%   95.73%   +0.16%     
============================================
  Files           113      111       -2     
  Lines         24991    24688     -303     
  Branches       2481     2448      -33     
============================================
- Hits          23884    23634     -250     
+ Misses          783      745      -38     
+ Partials        324      309      -15

Flag	Coverage Δ
#docs	29.59% <50%> (+0.1%)	⬆️
#doctesting	29.59% <50%> (+0.1%)	⬆️
#linting	29.59% <50%> (+0.1%)	⬆️
#linux	95.56% <50%> (+0.12%)	⬆️
#nobyte	92.33% <50%> (+0.64%)	⬆️
#numpy	93.16% <50%> (+51.11%)	⬆️
#pexpect	42.08% <50%> (+0.04%)	⬆️
#py27	93.73% <50%> (+0.18%)	⬆️
#py34	91.83% <50%> (?)
#py35	91.85% <50%> (?)
#py36	91.87% <50%> (?)
#py37	93.89% <50%> (+0.37%)	⬆️
#trial	93.16% <50%> (+51.11%)	⬆️
#windows	93.9% <50%> (+2.49%)	⬆️
#xdist	93.76% <50%> (+0.06%)	⬆️

Impacted Files	Coverage Δ
src/_pytest/pytester.py	87.33% <50%> (+0.33%)	⬆️
src/_pytest/warning_types.py	92.85% <0%> (-7.15%)	⬇️
src/_pytest/_code/source.py	90.74% <0%> (-0.85%)	⬇️
testing/python/raises.py	94.28% <0%> (-0.31%)	⬇️
src/_pytest/junitxml.py	94.36% <0%> (-0.21%)	⬇️
src/_pytest/skipping.py	95.23% <0%> (-0.17%)	⬇️
src/_pytest/monkeypatch.py	93.87% <0%> (-0.17%)	⬇️
src/_pytest/nose.py	97.22% <0%> (-0.08%)	⬇️
src/_pytest/reports.py	97.4% <0%> (-0.07%)	⬇️
testing/test_nose.py	98.86% <0%> (-0.05%)	⬇️
... and 42 more

---

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