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Learn how to effectively mock RestTemplate in your Spring Boot applications using Mockito. Discover the steps to eliminate the `Unfinished Stubbing` error in your unit tests.
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This video is based on the question https://stackoverflow.com/q/67475697/ asked by the user 'ima.technophyle' ( https://stackoverflow.com/u/15053014/ ) and on the answer https://stackoverflow.com/a/67475875/ provided by the user 'Dmitrii B' ( https://stackoverflow.com/u/14927001/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Unfinished Stubbing Error in Spring Boot with Mockito

If you're new to unit testing with JUnit and Mockito, you may encounter various challenges, one of which is the Unfinished Stubbing error. This can be particularly confusing, especially when working with complex mocking scenarios like testing your REST templates in Spring Boot applications. In this guide, we will unpack the problem of unfinished stubbing and walk you through a clear path to resolve it effectively.

Understanding the Problem

You might find yourself with a code snippet from your service class that looks something like this:

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And while writing tests with Mockito, you may end up writing something like this:

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The error message Unfinished Stubbing usually indicates that there is a problem within your mocking setup. To avoid this error, it's crucial to initialize your mocks properly and set their behaviors clearly.

The Solution

Follow these steps to resolve the Unfinished Stubbing error and set up your tests correctly with Mockito.

Step 1: Mock Initialization

First and foremost, you need to ensure that your mocks are initialized. Depending on the testing framework you are using (JUnit 4 or JUnit 5), you can do it as follows:

For JUnit 5, use @ BeforeEach to initialize your mocks:

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And for JUnit 4, you would do the same with @ Before:

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Step 2: Define Mock Behavior

Next, you should set up your mock behavior for any chained invocations. This is essential since Mockito needs to know what to return when your method calls are made. Here's how you can define your mock behavior properly:

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This clearly sets what to expect when getRequestFactory() is called on your restTemplate mock.

Step 3: Create a Complete Test Example

Here's a complete code example to illustrate the above principles in action:

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Conclusion

With the steps above, you should be well on your way to eliminating the Unfinished Stubbing error from your Spring Boot applications using Mockito. Properly initializing your mocks and defining clear behaviors will not only resolve this specific error but also strengthen your understanding of unit testing in Java.

By mastering these concepts, you'll enhance your ability to write effective unit tests and contribute to writing reliable code, bringing meaningful improvements to your development process.

If you found this article helpful, feel free to share it with your fellow developers who might be struggling with similar issues. Happy coding!