How to Unit Test a Custom Pipe in Angular | Unit testing Angular

Published: 09 February 2026
on channel: CodingForBeginners

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In this video, we learn how to unit test a custom pipe in Angular using Jasmine and Karma.

We test the ExclamationPipe created in the previous video and verify that the transform() method works correctly with different inputs.

Pipe testing is very simple compared to components and services, and this video shows the easiest way to test them.

🚀 What You’ll Learn

Why pipe testing is simple

Testing the transform() method directly

Writing clean unit tests for custom pipes

Best practice for testing pipes in Angular

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