Investigate failing py3 build with multiple test failures

[shashank88]

E AssertionError: assert 'Library test' in '<ExceptionInfo LibraryNotFoundException tblen=3>' E + where '<ExceptionInfo LibraryNotFoundException tblen=3>' = str(<ExceptionInfo LibraryNotFoundException tblen=3>)
Multiple tests are failing with the above.

[shashank88]

I think the issue is that pytest.raises now returns: https://docs.pytest.org/en/latest/reference.html#exceptioninfo
and str(e) no longer returns just the stringified error code. Possible that we might have to use . getrepr to get the same thing? Possibly breaking due to a new pytest version for py3?

[shashank88]

pytest-dev/pytest#5412 breaks the tests as str(e) no longer returns the message.
pytest 5.0.1 changes pytest.raises behaviour and it's a py3 only release.

[shashank88]

In [5]: def a():
...: raise BlahException("testing 12 333")

In [10]: with pytest.raises(Exception) as e:
...: a()
...:
...: print(str(e))
...: print(type(e))
...:

<class '_pytest._code.code.ExceptionInfo'>

[shashank88]

Need to change the the code to use str(e.value) instead of str(e) for py3. Need to check if the same works with py2.

[shashank88]

Fixed with PR: #797