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Learn how to mock the Keycloak Admin Client in Spring Boot unit tests effectively to avoid polluting users and maintain clean test environments.
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How to Mock Keycloak Admin Client in Spring Boot Unit Tests Without Polluting Users

Unit testing is a crucial practice in software development, serving to verify the functionality of individual components in an isolated manner. When working with Spring Boot and integrating Keycloak for identity and access management, mocking the Keycloak Admin Client during unit tests becomes essential to maintain clean and manageable tests. Here's how you can achieve this without polluting user data.

Why Mock Keycloak Admin Client?

Mocking the Keycloak Admin Client is important for several reasons:

Isolation: It ensures that your tests are not dependent on Keycloak's actual implementation.

Performance: Tests run faster since you don't have to interact with the actual Keycloak server.

Safety: Prevents any accidental changes to your Keycloak user data.

Consistency: Provides predictable outcomes by simulating various scenarios.

Step-by-Step Guide to Mock Keycloak Admin Client

Here’s a simple approach to mock Keycloak Admin Client in your Spring Boot unit tests.

Step 1: Add Dependencies

Include necessary dependencies in your pom.xml:

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Step 2: Create a Mock for Keycloak Admin Client

Utilize Mockito to mock the Keycloak Admin Client. Below is an example:

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In this sample, the Keycloak instance is mocked using Mockito. The realm method of the Keycloak class is stubbed to return a mock RealmResource.

Step 3: Testing the Service

Now you can write your tests by injecting the mock into your service. Here’s a continuation of the test method:

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Step 4: Service Layer for Keycloak Operations

Your service class might look something like this:

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Conclusion

Mocking the Keycloak Admin Client in Spring Boot unit tests ensures that your tests remain isolated, fast, and safe. By using Mockito to create mocks for the Keycloak objects, you can efficiently simulate various scenarios and validate your application's behavior without the risk of altering real user data.

Implementing these strategies will help you maintain a clean and effective testing environment, making your development process more robust and reliable.