Junit test of a model that uses multiple content fragment

[DanieleDiCorato]

I created this model that uses multiple content fragment , the first content fragment has the link to the other that need to be loaded (if it needs to) , so how I can create a junit test in this case? 

[HrishikeshKa]

Hi @DanieleDiCorato ,

Creating a JUnit test for a model that utilizes multiple content fragments in Adobe Experience Manager (AEM) involves several steps. Here's a high-level approach to guide you through the process:

1. Setup Test Environment: Make sure you have a test environment set up with AEM installed. You can use tools like Apache Sling Testing or AEM Mocks to simulate AEM environment for testing.

2. Mock Content Fragments: Mock the content fragments that your model depends on. You can either create mock content fragments programmatically or use a mocking framework like Mockito to mock the behavior of your content fragment API calls.

3. Instantiate and Test Model: Instantiate your model in your JUnit test and invoke the methods you want to test. Pass the mocked content fragments or mock the service calls as needed.

4. Test Scenarios: Write test cases to cover different scenarios such as loading content fragments, handling errors, and processing data correctly.

5. Assertions: Use assertions to verify that the model behaves as expected under different conditions. Check if the model correctly processes the data from the content fragments and produces the expected output.
   Here's a basic example of how your JUnit test might look like:

import org.junit.Before;
import org.junit.Test;
import static org.mockito.Mockito.*;

public class YourModelTest {

    private YourModel yourModel;
    private ContentFragmentService contentFragmentService;

    @Before
    public void setUp() {
        // Initialize your model and mock dependencies
        contentFragmentService = mock(ContentFragmentService.class);
        yourModel = new YourModel(contentFragmentService);
    }

    @Test
    public void testModelWithContentFragments() {
        // Mock content fragment data
        ContentFragment fragment1 = mock(ContentFragment.class);
        ContentFragment fragment2 = mock(ContentFragment.class);
        
        // Define behavior of content fragment service
        when(contentFragmentService.loadContentFragment("fragment1")).thenReturn(fragment1);
        when(contentFragmentService.loadContentFragment("fragment2")).thenReturn(fragment2);
        
        // Test your model method
        YourResult result = yourModel.processContentFragments("fragment1");
        
        // Assert expected behavior
        // For example:
        assertNotNull(result);
        // Add more assertions as needed
    }
}

In this example, ContentFragmentService is a service responsible for loading content fragments, and YourModel is the model you want to test. You mock the behavior of the ContentFragmentService to simulate the loading of content fragments, and then you test the behavior of your model method under different scenarios.

Remember to adjust the code according to your specific model and content fragment implementation.

[HrishikeshKa]

Hello @DanieleDiCorato ,

If got idea or if you get answer, if it is expected. please make it correct,

if you understand?

[DanieleDiCorato]

Thank you, my only doubt is the fact that the first content fragment has the path to all the CF that need  to be imported. So, during the execution of the method if certain conditions occur, the linked CF is loaded. How do I make sure that during this step the test loads the right resource?

[HrishikeshKa]

Hi @DanieleDiCorato ,

To ensure that the correct content fragments are loaded during the execution of your model's method, you'll need to mock the behavior of the ContentFragmentService to handle the loading of linked content fragments based on the provided paths.

Here's how you can approach this:

1. Set up your test data: Define your test data, including the paths of the content fragments that are expected to be loaded based on different scenarios.

2. Mock the behavior of the ContentFragmentService: Define the behavior of the ContentFragmentService mock to return the appropriate content fragments when requested based on the provided paths.

3. Invoke the method under test: Execute the method in your model that loads content fragments based on certain conditions.

4. Assert the results: Verify that the method under test behaves as expected by checking if the correct content fragments are loaded.

import org.junit.Before;
import org.junit.Test;
import static org.mockito.Mockito.*;

public class YourModelTest {

    private YourModel yourModel;
    private ContentFragmentService contentFragmentService;

    @Before
    public void setUp() {
        // Initialize your model and mock dependencies
        contentFragmentService = mock(ContentFragmentService.class);
        yourModel = new YourModel(contentFragmentService);
    }

    @Test
    public void testModelWithLinkedContentFragments() {
        // Mock content fragment data
        ContentFragment fragment1 = mock(ContentFragment.class);
        ContentFragment fragment2 = mock(ContentFragment.class);
        
        // Define behavior of content fragment service
        // Mock loading of the first content fragment with linked paths
        when(contentFragmentService.loadContentFragment("fragment1")).thenReturn(fragment1);
        // Mock loading of the linked content fragments based on the paths from fragment1
        when(contentFragmentService.loadContentFragment("linked_fragment1")).thenReturn(fragment2);
        
        // Test your model method
        YourResult result = yourModel.processContentFragments("fragment1");
        
        // Assert expected behavior
        assertNotNull(result);
        // Verify that the correct content fragments are loaded based on the provided paths
        verify(contentFragmentService).loadContentFragment("fragment1");
        verify(contentFragmentService).loadContentFragment("linked_fragment1");
        // Add more assertions as needed
    }
}

In this test, fragment1 is first loaded, and then the test verifies that the linked content fragments (linked_fragment1) are loaded based on the paths provided by fragment1. Adjust the mocked paths and behavior as per your specific requirements and scenarios.