Add unit tests

[caheredia]

Why

This PR introduces a framework for unit testing the repo. Docker-compose builds the environment by running the make up command. With the container running, the tests are run with make test. This same command will also run any additional tests added to the test directory.

I used the standard library test runner (unittest) because I didn't want to alter any source code or the original requirements.txt manifest. However, I added a test.Dockerfile file because the original installed the rebalance-lnd package. I wanted the flexibility to dev without rebuilding and reinstalling the environment.

What

• Built test container environment
• Added test runner command
• Tested output.py functions
• Added test README

[C-Otto]

Thanks a lot! This works using your docker approach, but not inside IntelliJ IDEA. Test cases that contain color/formatting magic in the output string don't pass the assertEqual assertion. Any idea how to fix this?

[caheredia]

@C-Otto Sorry I don't. I have a love/hate relationship with PyCharm. Sometimes it does too much This might be one of those cases. I tried to debug on my end. No luck. I suspect it PyCharm is changing the file encoding or interpreting the characters in the tests to how they should render instead of literal characters in the test cases.