[tests] Automate Jupyter notebook tests using nbmake.

[ChrisCummins]

This uses the nbmake pytest plugin to run the Jupyter notebooks in
make examples-test.

Fixes #450.

[alex-treebeard]

hey @ChrisCummins , I just released nbmake==0.10 which should work with pytest 6.1.0. Bugs/requests welcome!

[ChrisCummins]

hey @ChrisCummins , I just released nbmake==0.10 which should work with pytest 6.1.0. Bugs/requests welcome!

Thanks for the heads up @alex-treebeard!

Cheers,
Chris

[codecov-commenter]

Codecov Report

Merging #454 (3a6755a) into development (283941e) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #454      +/-   ##
===============================================
- Coverage        87.33%   86.99%   -0.35%     
===============================================
  Files              113      113              
  Lines             6403     6403              
===============================================
- Hits              5592     5570      -22     
- Misses             811      833      +22     

Impacted Files	Coverage Δ
compiler_gym/util/logging.py	0.00% <0.00%> (-100.00%)	⬇️
compiler_gym/util/flags/seed.py	0.00% <0.00%> (-100.00%)	⬇️
compiler_gym/util/flags/episodes.py	0.00% <0.00%> (-100.00%)	⬇️
compiler_gym/util/flags/output_dir.py	0.00% <0.00%> (-100.00%)	⬇️
compiler_gym/util/flags/learning_rate.py	0.00% <0.00%> (-100.00%)	⬇️
compiler_gym/util/flags/episode_length.py	0.00% <0.00%> (-100.00%)	⬇️
compiler_gym/util/flags/benchmark_from_flags.py	66.66% <0.00%> (-13.34%)	⬇️
compiler_gym/spaces/commandline.py	85.71% <0.00%> (-3.58%)	⬇️
compiler_gym/util/flags/env_from_flags.py	87.50% <0.00%> (-2.09%)	⬇️
...loop_tool/service/loop_tool_compilation_session.py	88.59% <0.00%> (+2.01%)	⬆️

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