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AssertJ core is a Java library that provides a fluent interface for writing assertions.It provides assertions for JDK standard types and can be used with JUnit, TestNG or any other test framework.

AssertJ fluent assertions sample
Image – AssertJ fluent assertions sample

Key Features :

  • AssertJ provides a rich set of assertions, truly helpful error messages, improves test code readability and is designed to be super easy to use within your favorite IDE.
  • AssertJ gives readable error messages, soft assertions, and improved collections and exception support.
  • You can easily write assertions for your own classes, which will make your test assertions reflect the domain
  • Basic tips :
    • Java 8 assertions
    • IDE configuration to directly get assertThat in code completion
    • Describe your assertion using as(String description, Object… args)
    • Exception assertions guide
    • Using String assertions on the content of a file

    Iterable and arrays assertions :

    • Combining filtering and assertions on iterables or arrays
    • Assertions on extracted properties/fields of iterable/array elements
    • Flat(map) extracting
    • Assertions on results of a method call on iterable/array elements
  • Gather all errors message with soft assertions
  • Using a custom comparison strategy in assertions
  • Field by field comparisons
  • Using a custom representation in assertions
  • Extending assertions with conditions
  • Creating assertions for your domain
  • AssertJ provides assertions for popular libraries like Guava,Joda Time & Neo4J

Get started with one minute starting guide

If you want to convert your JUnit assertions to AssertJ,here it is!

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Karthik

Allo! My name is Karthik,experienced IT professional.Upnxtblog covers key technology trends that impacts technology industry.This includes Cloud computing,Blockchain,Machine learning & AI,Best mobile apps, Best tools/open source libs etc.,I hope you would love it and you can be sure that each post is fantastic and will be worth your time.
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Summary
Use AssertJ to improve your test code readability, maintenance of tests easier
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Use AssertJ to improve your test code readability, maintenance of tests easier
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AssertJ core is a Java library that provides a fluent interface for writing assertions.It provides assertions for JDK standard types and can be used with JUnit, TestNG or any other test framework.
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