Mocking AEM Asset Manager using WCM IO - junit

Question

I am creating a sling model which fetched a excel file from the file to read and display data in an AEM component.
#Model(
adaptables = SlingHttpServletRequest.class,
defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL
)
public class OnlineCoursesModel {
#Self
private SlingHttpServletRequest request;
#ValueMapValue
private String filePath;
private List<OnlineCourseDTO> onlineCourses;
#PostConstruct
public void init() {
AssetManager assetManager = request.getResourceResolver().adaptTo(AssetManager.class);
Asset asset = assetManager.getAsset(filePath);
/** Do Something With the Asset **/
}
}
In AEM it's working fine, but when I try to use it with the WCM.io AEM mocking framework, the assetManager is returning null.
#Test
public void checkIfFileIsRead() {
context.load().binaryFile(COURSES_EXCEL_FILE, EXCEL_RESOURCE_PATH);
context.load().json(ONLINE_COURSE_LISTING_AUTHORED, TEST_CONTENT_ROOT);
resource = context.request();
undertest = resource.adaptTo(OnlineCoursesModel.class);
System.out.println(undertest);
}

Answer 1

Your test is a little bit too complicated. Can you please try this simpler version:
#Test
public void checkIfFileIsRead() {
context.create().asset("/content/dam/image.jpg", 1, 1, StandardImageHandler.JPEG_MIMETYPE);
undertest = context.request().adaptTo(OnlineCoursesModel.class);
assertNotNull(undertest);
}
This will create a new asset at /content/dam/image.jpg with a width of 1 and a height of 1 and mime type image/jpg.
You do not need to load a binary and additional json.
Additional notes
You also do not need to adapt from a request. That is considered bad practice and should only be done if you need specific information that is only part of the request. For example information about the user sending the request.
Otherwise, always adapt from Resource.class.
Example:
#Model(adaptables = Resource.class)
public class OnlineCoursesModel {
#OSGiService
private AssetManager assetManager;
#PostConstruct
public void init() {
Asset asset = assetManager.getAsset(filePath);
/** Do Something With the Asset **/
}
}