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All LessonsFree Lessons (2)

Introduction

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Challenge: Test a Function

Use your knowledge to write unit tests to test a function that checks if a username is valid.

We'll cover the following...

- Problem statement
- Expected output
- Your implementation

Problem statement

Suppose that we want the username to contain at least one letter followed by at least one number. Implement a function that checks this and write unit tests to test the function. ...