This course was updated! We now recommend you take the Testing React Applications, v2 course.

Check out a free preview of the full Testing JavaScript Applications (feat. React and Redux) course:
The "Challenge 1: Simple Unit Test" Lesson is part of the full, Testing JavaScript Applications (feat. React and Redux) course featured in this preview video. Here's what you'd learn in this lesson:

In this challenge, students write a unit test to check a returned value is a number.

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