In this lesson you will create a new project with a virtual environment and write your first unit test with pytest. In doing so, you will learn:

• install pytest
• organize your project to support automated test discovery
• setup Visual Code to use pytest as your test engine
• best practice naming conventions for tests in Python

 

Install:

sudo apt install virtualenv

 

Create virtualenv inside project folder:

virtualenv -p /usr/local/bin/python3 .env

 

Source to the env:

source .env/bin/activate

 

Install the lib:

pip install pytest pylint

 

VSCode workspace settings:

{    "python.pythonPath": "${workspaceFolder}/.env/bin/python",    "python.unitTest.pyTestEnabled": true,    "python.unitTest.pyTestArgs": [        "--ignore=.env",        "-s"    ],    "python.envFile": "${workspaceFolder}/.envFile"}

 

Code to test:

import pytestimport common_mathclass TestCommonMath(object):    def test_add(self):        result = common_math.add(1,2)        assert result == 3

 

Testing code:

def add(num1, num2):    return num1 + num2