Proposal to add a test folder on the v2.0.0 template

[JMasr]

I wanna propose an adition to the v2.0.0 template. Adding support for testing, with a test folder and a make test step.

pros:

• Promote TDD and best testing practice on the data science comunity
• Validate the code before using it by a make test step on the workflow
• Clean Code for all ;)

cons

• What testing tool the comunity should use?
• Dev a generic tools that scan the test framework used on the project and run the test using that framework
• Standarization could be hard :`(

Possible road map:

1. Add a folder to the project structure on the same lv of docs folder and {{ cookiecutter.module_name }}

├── LICENSE            <- Open-source license if one is chosen
├── Makefile           <- Makefile with convenience commands like `make data` or `make train`
├── README.md          <- The top-level README for developers using this project.
├── data
│   ├── external       <- Data from third party sources.
│   ├── interim        <- Intermediate data that has been transformed.
│   ├── processed      <- The final, canonical data sets for modeling.
│   └── raw            <- The original, immutable data dump.
│

├── test <- A default pytest module for testing the source code of the project

│
├── docs               <- A default mkdocs project; see www.mkdocs.org for details
│
├── models             <- Trained and serialized models, model predictions, or model summaries
│
├── notebooks          <- Jupyter notebooks. Naming convention is a number (for ordering),
│                         the creator's initials, and a short `-` delimited description, e.g.
│                         `1.0-jqp-initial-data-exploration`.
│
├── pyproject.toml     <- Project configuration file with package metadata for 
│                         {{ cookiecutter.module_name }} and configuration for tools like black
│
├── references         <- Data dictionaries, manuals, and all other explanatory materials.
│
├── reports            <- Generated analysis as HTML, PDF, LaTeX, etc.
│   └── figures        <- Generated graphics and figures to be used in reporting
│
├── requirements.txt   <- The requirements file for reproducing the analysis environment, e.g.
│                         generated with `pip freeze > requirements.txt`
│
├── setup.cfg          <- Configuration file for flake8
│
└── {{ cookiecutter.module_name }}   <- Source code for use in this project.
    │
    ├── __init__.py             <- Makes {{ cookiecutter.module_name }} a Python module
    │
    ├── config.py               <- Store useful variables and configuration
    │
    ├── dataset.py              <- Scripts to download or generate data
    │
    ├── features.py             <- Code to create features for modeling
    │
    ├── modeling                
    │   ├── __init__.py 
    │   ├── predict.py          <- Code to run model inference with trained models          
    │   └── train.py            <- Code to train models
    │
    └── plots.py                <- Code to create visualizations   

2. Add a step to the Makefile

## Install Python Dependencies
.PHONY: test
requirements:
    $(PYTHON_INTERPRETER) -m pip install -U pip, pytest
    $(PYTHON_INTERPRETER) -m pytest tests