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Lecture 5

Automated testing

Survey

Project Part 2

How did it go?

Questions?

How do you know your code works?

Example

We want to normalize phone numbers. What situations do we need to handle?

Solution

Test-Driven Development (TDD)

  1. Create an empty function
  2. Try the different test cases
  3. Make them pass
    • Small increments
  • Working backwards from the expected behavior
  • Test cases
    • Edge cases
  • The tests become the requirements
  • print()
  • assert
  • Loop

Running through VSCode

Debugging

Unit testing

  • inputs → function → expected outputs
  • Generally testing:
    • Small chunks of code
    • Specific functionality
  • Generally should work offline, i.e. not talk to an API or anything
  • Generally will use small sets of sample data
  • Unit testing: individual components
  • Integration testing: multiple components together

There are others — it's essentially a spectrum of small to large.

When might we want to use unit vs. integration tests? In other words, what are the pros and cons of each?

pytest

Structured way of doing what we were already doing

Parametrization

Profiling

Examples

Project Part 3

Reminder of the Project expectations.