[MRG] Test R minor version and add more tests

[aplamada]

Update the R tests and add more tests to address the issues noticed in #1077 .

Feedback is welcome.

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[aplamada]

@yuvipanda When I noticed the problem with the R version (see #1077 ) I had in mind at least to systematically improve the tests for the minor version, and I thought to do it similar to the Python part.
In the meantime the master evolved and I noticed also some improvements in this direction.
What do you recommend me to do with this PR?
I understand that what I did: just improving the tests and not solving the problem is not the most constructive approach ...

[yuvipanda]

I didn't see this PR properly before (sorry @aplamada) and I think I've added very similar tests to #1104. Can you see if any of these tests would be helpful there? If not, let's close this PR?

I'm really sorry this wasn't reviewed sooner. I think added tests are always useful, wether they solve the underlying problem or not!

[aplamada]

@yuvipanda Thanks for the reply.
The tests are very similar.
tests/conda/r could be improved similar to tests/r/ to include tests for the versions 3.6, 4.0 and 4.1.
What do you think?

I think it makes sense to close this PR.

[yuvipanda]

@aplamada yeah, that would be great! I haven't really paid any attention to the conda/r stuff at all. Would you be interested in working on that? I can help with more prompt review this time.

[aplamada]

Yes. I am thinking to close this PR and make a new one for conda tests only.
When I will close it I will mention #1104 and the new one. What do you think?

[yuvipanda]

@aplamada that sounds great.

[aplamada]

The PR is closed since the test are covered in #1104 and #1108 .