JUNIT5: What Exactly is org.mockito.junit.jupiter.MockitoExtension and Sling Model Example

org.mockito.junit.jupiter.MockitoExtension is a JUnit 5 extension provided by the Mockito library. It allows you to use the Mockito framework to create and inject mocked objects into your JUnit 5 test classes. This extension provides several features such as annotation-based mock creation, automatic detection of unused stubs, and support for the Mockito API. It enables you to write clean and readable tests by allowing you to use the familiar Mockito API directly in your JUnit 5 tests, without the need to manually instantiate mock objects or use a separate mocking framework. This can make it easier to write and maintain unit tests that use mocked dependencies.

In additional, this post will be relating more to a Sling Model. In this example, we will create a sling model utilizing dependencies of 2 services.

Example Implementation for a Sling Model

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Here is an example implementation of the UnderTestSlingModel class that can be used in the provided JUnit5 test:

java
Copy code
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.injectorspecific.SlingObject;

@Model(adaptables = SlingHttpServletRequest.class)
public class UnderTestSlingModel {

@SlingObject
private Service1 service1;

@SlingObject
private Service2 service2;

public String getData() {
return service1.getData() + service2.getData();
}
}

Example JUNIT5:

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import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.InjectMocks;
import org.mockito.junit.jupiter.MockitoExtension;

import io.wcm.testing.mock.aem.junit5.AemContext;
import io.wcm.testing.mock.aem.junit5.AemContextExtension;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.when;

@ExtendWith({AemContextExtension.class, MockitoExtension.class})
class UnderTestSlingModelTest {

@Mock
private Service1 service1;

@Mock
private Service2 service2;

@InjectMocks
private UnderTestSlingModel underTest;

private AemContext context = new AemContext(ResourceResolverType.JCR_MOCK);

@Test
void test1() {
// Setting up the mocked services
context.registerService(service1);
context.registerService(service2);

// Creating the underTest sling model
underTest = context.request().adaptTo(UnderTestSlingModel.class);

//Testing the mocked services
when(service1.getData(any())).thenReturn("test1");
when(service2.getData(any())).thenReturn("test2");

assertEquals("test1test2", underTest.getData());
}

@Test
void test2() {
// Setting up the mocked services
context.registerService(service1);
context.registerService(service2);

// Creating the underTest sling model
underTest = context.request().adaptTo(UnderTestSlingModel.class);

//Testing the mocked services
when(service1.getData(any())).thenReturn("test3");
when(service2.getData(any())).thenReturn("test4");

assertEquals("test3test4", underTest.getData());
}
}

pom.xml

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<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.7.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>5.7.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.wcm</groupId>
<artifactId>io.wcm.testing.mock.aem</artifactId>
<version>7.4.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-junit-jupiter</artifactId>
<version>3.6.28</version>
<scope>test</scope>
</dependency>

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JUNIT5: What Exactly is org.mockito.junit.jupiter.MockitoExtension and Sling Model Example