Update tests for new resolver compatibility

[sbidoul]

No description provided.

[codecov]

Codecov Report

Merging #58 (1150504) into master (e762c6e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   95.17%   95.18%   +0.01%     
==========================================
  Files          16       16              
  Lines         932      935       +3     
  Branches      174      174              
==========================================
+ Hits          887      890       +3     
  Misses         29       29              
  Partials       16       16              

Impacted Files	Coverage Δ
src/pip_deepfreeze/list_installed_depends.py	100.00% <100.00%> (ø)
src/pip_deepfreeze/req_parser.py	100.00% <100.00%> (ø)
src/pip_deepfreeze/tree.py	94.44% <100.00%> (+0.07%)	⬆️

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