Build Your Own Test Framework: A Practical Guide to Writing Better Automated Tests

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

D. IrvineBuild Your Own Test Frameworkhttps://doi.org/10.1007/978-1-4842-9247-1_2

2. Building a Function to Represent a Test Case

Daniel Irvine¹  

(1)

London, UK

 

In this chapter we’ll build a function that encapsulates a single test case. It’s called it and it looks like this:

it("describes a test", () => {

  // ... test commands

});

Calls to it have two parts: the description and the test code. We’ll see how this function can be implemented as the first major piece of the concise-test test runner.

By the end of the chapter, you’ll have learned

• The history of the it function

• The importance of describing tests well

• How to use exceptions to represent test failures

• How ...