Add tests for NMT base and NMT master

[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 68.74%. Comparing base (c4560da) to head (6fa2986).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #504      +/-   ##
==========================================
+ Coverage   67.90%   68.74%   +0.83%     
==========================================
  Files          26       26              
  Lines        3116     3116              
  Branches      527      527              
==========================================
+ Hits         2116     2142      +26     
+ Misses        858      837      -21     
+ Partials      142      137       -5     

see 2 files with indirect coverage changes

[erlend-aasland]

More yak shave for #500.

[acolomb]

Wow, this is impressive. Thank you very much for your diligence. I could never have come up with all these test cases...

[erlend-aasland]

FTR, I will follow up with a PR for hardening the NMT slave tests.