Capture output from unittest tests

[kondratyev-nv]

Now when running unittest tests only result of a test is captured from a TestResult of failed and skipped tests.
For a debug purpose it would be great to capture stdout from tests.

[darkvertex]

When running stuff from pytest, the -s flag will disable all capturing (silencing) during execution, thus prints and such will make it during execution.

It's quite tricky to know which output is from what test though. The easiest way would be to open the output of the last test run.

[jamescasbon]

One possibility is to use the junitxml output which contains all this information in a structured format.

[yozlet]

This would also be great for pytest tests. Right now there's only a one-line error, without any further context. This is particularly frustrating given that pytest often gives useful explanations of test failures, but they're not shown.

[kondratyev-nv]

@yozlet JFYI, output capturing for pytest was added in version 0.2.6.

[yozlet]

@kondratyev-nv Yep, I noticed. Thank you! With that and fixing test discovery for pytest 4.1.x, you've removed the two blockers that were keeping me on the command line.

[kondratyev-nv]

The unittest output capturing was added in version 0.3.0, so this issue can be closed.