# Extending Mockito

DevFeed: [Extending Mockito](<https://devfeed.tech/articles/extending-mockito-28651.md>)

Original publisher: [Read original article](<https://jeroenmols.com/blog/2016/10/31/mockitomatchers/>)

Author: info@jeroenmols.com (Jeroen Mols)

Published: 2016-10-31T00:00:00Z

Content type: tutorial

Language: en

Sources: [Jeroen Mols](<https://devfeed.tech/sources/jeroen-mols.md>)

Topics: [Mocking](<https://devfeed.tech/topics/mocking.md>), [Java](<https://devfeed.tech/topics/java.md>), [unit tests](<https://devfeed.tech/topics/unit-tests.md>), [Framework](<https://devfeed.tech/topics/framework.md>)

Tags: [android](<https://devfeed.tech/tags/android.md>), [blogs](<https://devfeed.tech/tags/blogs.md>), [examples](<https://devfeed.tech/tags/examples.md>), [framework](<https://devfeed.tech/tags/framework.md>), [github](<https://devfeed.tech/tags/github.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [java](<https://devfeed.tech/tags/java.md>), [library](<https://devfeed.tech/tags/library.md>), [mastodon](<https://devfeed.tech/tags/mastodon.md>), [mocking](<https://devfeed.tech/tags/mocking.md>), [mockito](<https://devfeed.tech/tags/mockito.md>), [testing](<https://devfeed.tech/tags/testing.md>), [tests](<https://devfeed.tech/tags/tests.md>), [unit-tests](<https://devfeed.tech/tags/unit-tests.md>)

## AI overview

A tutorial on extending Mockito with custom argument matchers. It explains how custom matchers can simplify verification of collection contents in unit tests and mentions a GitHub library of collection matchers.

## Source excerpt

Due to its clean simple api, Mockito has become world's most popular Java mocking framework. After having covered all of its basics, it's time to spice things up and start extending Mockito.