Implement a test suite

[arturossouza]

At the moment, we don't have any tests on the implementation. That makes the code harder to evolve and we leds us to insecure developments. Also, a test suite would be great for PR validations and to maintain the code quality.

Taks:

1. Create a test suite folder for each class and function of MoStress implementation

Obs.: This is a relative huge taske, maybe is the case to split this one