Integration testing with pytest

Introduction to Testing in Python

Alexander Levin

Data Scientist

What is integration testing?

Integration testing - software testing method, that allows to verify that an interaction behaves normally.
Integration - an interaction between 2 or more modules inside of a system.

diagram of integration example

Integrations in real-life projects

Examples:

Power cable
Internet connection
File reading driver
Database connection
Application Programming Interface (API) integration

What can go wrong

Potential integration problems:

Lost connection
Loss of data
Interaction delays
Low bandwidth
Version conflicts
Interface mismatch
Others

Example of integration testing

import pytest, os

@pytest.fixture
def setup_file():
    # Create temporary file
    file = "test_file.txt"
    with open(file, "w") as f1:
        f1.write("Test data 1")
    yield file
    os.remove(file)

def test_fs(setup_file):
    file = setup_file
    # Check that the file was created successfully
    assert os.path.exists(file)

Summary

Integration testing - software testing method; allows to verify that an integration works as expected.
Real-life projects include a lot of different integrations in them.
Integration testing helps to prevent lots of potential problems.
Example: checking integration between Python and a file system.

Let's practice!

Introduction to Testing in Python