Overview of automated testing

Case Study: Building Software in Python

Mark Pedigo

Principal Data Scientist

Roadmap

Roadmap showcasing what parts of the project we've finished and which we'll be starting.

Automated Testing and the Development Workflow

Correct, predictable results
Predefined test cases
Automatic execution

A computer with a screen showing the words "automated testing" surrounded by bugs and gears, representing automated testing.

The doctest library

Automated testing: doctest, pytest
Use docstrings to describe code
doctest: Validate docstring examples

Features of the doctest library

Inline testing
Easy to use
Documentation as tests
Supports regression testing

Example Use

def area(l, w):
    """
    Finds the area given length and width and returns the result
    >>> area(1, 1)
    1
    """
    return l + w

import doctest
doctest.testmod()

Example Use

Failed example:
    area(1,1)
Expected:
    1
Got:
    2

Example Use

def area(l, w):
    """
    Finds the area given length and width and returns the result
    >>> area(1, 1)
    1
    """
    return l * w

import doctest
doctest.testmod()

Everything OK = no error messages, no output

Let's practice!

Case Study: Building Software in Python