Add tests

[manparvesh]

Description:

Add automated tests to the project. Currently, the Travis build simply runs pytest, but since there are no tests, it passes.

This task will take a considerable effort.

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[manparvesh]

For now, #36 fixes the failing travis build. I replaces pytest with python setup.py test, and it checks if the setup builds properly.
We can use pytest in the future when the tests are written properly

[skrambol]

I'm interested in adding some tests. We can use the official testing provided by Click. Should we place the tests inside the modules or a separate directory?

[manparvesh]

@systemplado that's cool! 😄 We should use that. We should place the tests in a different directory, since it's not a module.

[manparvesh]

As suggested by @systemplado, I have started writing tests for yoda using click.testing. If someone is interested to contribute, they can take a look at the sample test file that I have written: test_speedtest.py

[manparvesh]

I think it is okay to believe that the test coverage is fine for the project. However, I think it still needs improvement, so this will be continued in #71 and I will close this issue