Скачать или смотреть Resolving WithUserDetails Failing Issue in Spring Boot Tests

Learn how to solve the issue of `WithUserDetails` failing due to "username not found" in Spring Boot tests by properly mocking your UserRepository.
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This video is based on the question https://stackoverflow.com/q/71589825/ asked by the user 'Leighton' ( https://stackoverflow.com/u/2597935/ ) and on the answer https://stackoverflow.com/a/71590299/ provided by the user 'Jayesh Choudhary' ( https://stackoverflow.com/u/4050313/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling WithUserDetails Failing due to Username Not Found in Spring Boot Tests

When developing applications using Spring Boot, it is common to encounter issues while writing tests for user-related functionalities. A particular problem arises with the @ WithUserDetails annotation, where you might see a failure with the message "username not found." This guide explores this challenge and provides an effective solution.

The Problem

In a recent scenario, a developer experienced a failure in their test for the AuthController.java, specifically in the AuthControllerTests.java. The test aimed to verify whether a user could access an endpoint when authenticated, but it failed due to the UserService.java implementation returning null. The culprit here is the call to userRepository.findUserByEmail(username) which, when mocked, returns null, thus triggering a UsernameNotFoundException.

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The test would fail even if the UserRepository Bean was not mocked due to a dependency issue in the AuthController constructor.

The Solution

To resolve the issue, you'll need to ensure that the findUserByEmail method of the mocked UserRepository does not return null. Here’s how to achieve that:

Step-by-Step Breakdown

Declare the Mock for UserRepository:

You might already have this done in your test class:

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Configure the Behavior of the Mock:

Before invoking the mocked perform method, you need to specify what the mocked UserRepository should return. Add the following line to your test method:

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This line effectively tells the mocked repository that whenever the findUserByEmail method is called with any string, it should return a new instance of User. This prevents the null return and the subsequent UsernameNotFoundException.

Final Setup in Test Method

Thus, the complete segment of your test method would look like this:

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Conclusion

By ensuring that your mock is appropriately set up and simulates the expected behavior of the real UserRepository, you'll be able to skip over the null pointer issue and successfully execute your test with @ WithUserDetails. This not only helps you validate your authentication logic effectively but also reinforces best practices for unit testing within the Spring Boot framework.

Happy coding and testing! Don’t hesitate to share your thoughts or any further issues you might face in the comments below.