Use tempfile for temporary directory in tests.

[tjni]

This lets builders control the base directory for temporary files, such as by using the TMPDIR environment variable.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (d75a89b) 84.75% compared to head (b0191d1) 84.79%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #708      +/-   ##
==========================================
+ Coverage   84.75%   84.79%   +0.04%     
==========================================
  Files          36       36              
  Lines        2105     2105              
==========================================
+ Hits         1784     1785       +1     
+ Misses        321      320       -1     

see 1 file with indirect coverage changes

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[lanpa]

Thanks!