Increase export_eds() test coverage

[erlend-aasland]

No description provided.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.84%. Comparing base (503918c) to head (6b1d8ae).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #474      +/-   ##
==========================================
+ Coverage   67.68%   67.84%   +0.16%     
==========================================
  Files          26       26              
  Lines        3104     3104              
  Branches      521      521              
==========================================
+ Hits         2101     2106       +5     
+ Misses        862      859       -3     
+ Partials      141      139       -2     

see 2 files with indirect coverage changes

[erlend-aasland]

Moreover, don't shadow tempfile; use instead the parameter name of the API: dest.

[erlend-aasland]

I expanded the scope of the PR with 083c24c; I've split up the tests in multiple test functions, for easier debugging in case one of them fails. I also used subTest to for a more user-friendly response in case a test fails. Added tests for some more paths through export_od().

[acolomb]

Waiting for #476, as that will change the raised exception type.

[erlend-aasland]

Thanks for the review! Thanks to @sveinse for the yak-shave in 5db5913.

[erlend-aasland]

Ouch, I seem to have introduced a temporary file mess when running the tests. Sorry 'bout that; I'll create a PR to ensure tests are properly cleaned up.