Jest contains matcher functions that allow developers to be explicit about what they want their code to do. Most ways of comparing numbers have matcher equivalents, such as toBeGreaterThan and toBeLessThan.
Additionally, there are matchers for strings, objects, arrays, and booleans.
These matchers can be used to check the output of a function against expected values.
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Expect · Jest
Mock functions allow you to test the links between code by erasing the actual ... (and thus creating slow and fragile tests), we can use the jest.mock(...) ...
Mock Functions · Jest
jest-dom is a companion library for Testing Library that provides custom ... using some of these matchers, you may need to make sure you use a query function ...
jest-dom | Testing Library
In part 1 I covered the first 4 types of Jest matchers. In this post I’m going to cover contains matchers, async matchers, snapshot matchers, function ...
One-page guide to Jest: usage, examples, and more. A quick overview to Jest, a test framework for Node.js. This guide targets Jest v20.