Module 5 - Getting Familiar with DevOps Processes and Tools

This directory builds on the Module 4 code which includes several Docker-related and CRM-app related content. The additions are discussed below. Note that the setup/ directory has been removed as it is assumed that Docker and docker-compose are still installed from the previous module.

Tests

This module introduced linting, unit tests, and system tests.

• .pylintrc: The configuration file used by pylint, a Python syntax and styling checker.
• src/test_unit.py: Set of unit tests to evaluate the Database class balance() and owes_money() methods. This latter method was added using test-driven development (TDD).
• src/test_system.py: Set of system tests which uses docker-compose to set up several containers then uses Python requests to test the complete functionality of all running containers.

Test Pipeline

The course demonstrated Travis CI at a high-level to illustrate how all the pieces fit together. The .travis.yml file contains the "script" that Travis will follow upon every git push or pull request (PR) operation.

Using unittest Instead of pytest

I've included an alternative implementation of the pytest examples in the course using the unittest library. The files relevant to this alternative are shown below.

$ tree src    
src/
|-- database_test_case.py
|-- system_test_case.py
|-- unittest_logs
|   |-- fail_log.txt
|   `-- pass_log.txt
`-- unittest_run.py

The files in unittest_logs/ directory just capture the output from running unittest_run.py. I show both successful and failed (TDD-based) runs. The *_test_case.py files inherit from unittest.TestCase which provides the backend assert methods, setup, teardown, and other basic features. The unittest_run.py is the main script which uses a variety of auxiliary unittest components to build and execute test suites..