Testing in Python: Unit Tests

This repo conatins an exmaple how to write a unit tests in python. In this repo, I show how to run the unit tests, I also go through a process of achieving 100% test coverage by demonstrating:

• unittest
• pytest
• coverage.py
• pytest-cov

With all these things I achieve 100% Test Coverage in Python.

Unit test in python slides in the below link

• https://bit.ly/3uOmny9

Setup

• Create a dirctory for the app: ie

mkdir project 

• Clone the project:

git clone git@github.com:mkassaf/UnitTestInPython.git 

• Go to the app:

cd UnitTestInPython 

• Creating virtual environments:

python3 -m venv vnev

• Activate virtual environment:

source vnev/bin/activate 

• install the dependanceies:

pip3 install -r requirements.txt 

Steps

Run test using pytest

pytest test_calculatorApp.py 

Result summary report in python nosetests

• You can run tests for your project using this nosetests :

    nosetests 

• For help with nosetests’ many command-line options, try :

    nosetests -h 

• For example,

nosetests --with-xunit 

generates a xml file conatin the test cases run report.

Code coverage

• To analyses file, Run:

    coverage run calculatorApp.py 

• To generate outputs anaylsys and shows covered lines, Run:

    coverage report -m 

• To create a more concise html version of the report, Run:

   coverage html 

Run the test and generate code coverage

• Run the following command to run the tests and print the code coverage:

  pytest --cov=calculatorApp 

• Run the following command to run the tests and generate html report for the code coverage:

  pytest --cov=calculatorApp --cov-report=html 

Refernces

• https://docs.python.org/3/library/unittest.html#unittest.TestCase.assertRaises
• https://coverage.readthedocs.io/en/6.3.2/
• https://realpython.com/python-testing/
• https://docs.python.org/3/library/venv.html
• https://www.datacamp.com/community/tutorials/unit-testing-python
• https://docs.python.org/3/library/unittest.html
• https://geekflare.com/unit-testing-with-python-unittest/
• https://www.youtube.com/watch?v=7BJ_BKeeJyM&ab_channel=SBCODE
• https://docs.python.org/3/library/unittest.mock.html#unittest.mock.patch
• https://realpython.com/python-mock-library/#patch