[bugfix] Improve handling of bad tests to avoid frontend crashing

[rsarm]

Closes #554

[vkarak]

I think that we should give the option to print the stack traces on demand. When developing a test, this is really useful. We have an issue #491 about that. But the problem with the proposed implementation is that it will not be easy to print the stack trace, unless we make the program options globally available, which is not the best solution perhaps. I am not yet convinced that what we are trying here is best solution.

[pep8speaks]

Hello @rsarm, Thank you for updating!

Cheers! There are no PEP8 issues in this Pull Request!Do see the ReFrame Coding Style Guide

Comment last updated on January 24, 2019 at 23:28 Hours UTC

[teojgo]

lgtm

[vkarak]

I have cleaned up slightly the implementation, but it is essentially the same. The stack trace is emitted at the verbose level and user is hinted to use the -v option to see it.

[codecov-io]

Codecov Report

Merging #623 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #623      +/-   ##
==========================================
+ Coverage   91.75%   91.82%   +0.07%     
==========================================
  Files          76       77       +1     
  Lines        9326     9346      +20     
==========================================
+ Hits         8557     8582      +25     
+ Misses        769      764       -5

Impacted Files	Coverage Δ
...ttests/resources/checks_unlisted/bad_init_check.py	100% <100%> (ø)
unittests/test_loader.py	100% <100%> (ø)	⬆️
reframe/core/decorators.py	98.57% <100%> (+0.29%)	⬆️
reframe/core/exceptions.py	83.94% <0%> (+3.64%)	⬆️

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[vkarak]

I mark this as a WIP, because we still need an additional unit test to cover the case of the loading of a bad test.