Unit test

Pytest

Unittest Python native module

https://docs.python.org/3/library/unittest.mock.html

very useful because you can easily replace the module call within the test target

e.g. you can pretend a module/methods return value within the test target, without the need to modify it.

Setup

1. Better to start with this structure. A separated test folders
2. ~~Create an empty __init__.py in proj_root/tests/~~
   1. ~~Now you can run pytest and import the src files correctly~~
   2. ~~BUT, the import inside src files, that you imported, still not work.~~

3. Create a file [conftest.py](http://conftest.py) in proj_root/tests/ with below content:

   import os
   import sys
   
   sys.path.append(
       os.path.abspath(os.path.dirname(os.path.abspath(__file__)) + "/../src/")
   )
   

   So the src folder is also added to sys path

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