Testing Pipes and Directives

Learn how to test pipes and directives in Angular.

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Testing pipes

In this lesson, we will learn how to test a pipe. Previously, we learned that a pipe is a TypeScript class that implements the PipeTransform interface. It exposes a transform method, which is usually synchronous, which means it is straightforward to test. The list.pipe.ts file contains a pipe that converts a comma-separated string into a list:

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