Create test export pdf

[JoshKowi]

No description provided.

[JoshKowi]

On my local computer the tests also work, i am not sure why the code on github doesnt get the pdf file.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.93617% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.47%. Comparing base (6429b68) to head (7871626).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pywikitools/test/test_export_pdf.py	98.92%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   84.64%   85.47%   +0.82%     
==========================================
  Files          63       65       +2     
  Lines        5140     5348     +208     
==========================================
+ Hits         4351     4571     +220     
+ Misses        789      777      -12     

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[holybiber]

Thanks, most of it looked very good! There were a few unnecessary lines und a few things taken from ExportHTML that don't belong here - see my last commit.
I looked at the coverage report and there are a few lines still not covered but that's fine for now.