tests: fix for pytest 4

[blueyed]

No description provided.

[codecov-io]

Codecov Report

Merging #675 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #675      +/-   ##
==========================================
+ Coverage   94.05%   94.05%   +<.01%     
==========================================
  Files          33       33              
  Lines        1849     1850       +1     
  Branches      158      158              
==========================================
+ Hits         1739     1740       +1     
  Misses         82       82              
  Partials       28       28

Flag	Coverage Δ
#dj110	86.32% <66.66%> (ø)	⬆️
#dj111	88.7% <100%> (ø)	⬆️
#dj18	87.29% <66.66%> (ø)	⬆️
#dj19	86.1% <66.66%> (ø)	⬆️
#dj20	86.59% <100%> (ø)	⬆️
#dj21	82.64% <100%> (ø)	⬆️
#mysql_innodb	86.81% <100%> (ø)	⬆️
#mysql_myisam	86.64% <100%> (ø)	⬆️
#postgres	89.94% <100%> (ø)	⬆️
#py27	91.62% <100%> (ø)	⬆️
#py34	86.1% <66.66%> (ø)	⬆️
#py35	86.32% <66.66%> (ø)	⬆️
#py36	87.13% <100%> (ø)	⬆️
#py37	82.64% <100%> (ø)	⬆️
#sqlite	88.27% <100%> (ø)	⬆️
#sqlite_file	86.1% <66.66%> (ø)	⬆️

Impacted Files	Coverage Δ
pytest_django/fixtures.py	97.29% <100%> (+0.01%)	⬆️

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