Track 13 · Lesson 12 of 12

Debugging with tests: a pricing module

Reproduce each bug as a failing test, fix it, and keep the test; then build a complete test suite for a small pricing module.

You will be able to

• Turn a bug report into a minimal failing test that reproduces it
• Use the failing test, tracebacks and small experiments to locate the cause
• Fix the bug and keep the test as a regression test
• Build a test suite for a small module, milestone by milestone