Unit Testing ChildResource

Question

In Unit Test, @ChildResource annotation property always return null. Can anyone please guide me to resolve the issue?

Environment Details: AEM 6.5.16 and Java 11

CountryListImpl.java

@Model(
    adaptables = SlingHttpServletRequest.class,
    adapters = { CountryList.class },
    resourceType = CountryListImpl.RESOURCE_TYPE,
    defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL
)
@Exporter(
    name = ExporterConstants.SLING_MODEL_EXPORTER_NAME,
    extensions = ExporterConstants.SLING_MODEL_EXTENSION
)
public class CountryListImpl implements CountryList {
    protected static final String RESOURCE_TYPE = "aem-demo/components/country-list";
    protected static final String COUNTRY_LANGUAGE_LIST = "countryItems";

    @ValueMapValue
    @Named("title")
    String defaultLabel;

    @ChildResource(name = COUNTRY_LANGUAGE_LIST)
    List< CountryItem > countryList;

    public String getDefaultLabel() {
        return defaultLabel;
    }

    public List<CountryItem> getCountryList() {
        return countryList;
    }
}

CountryItemImpl.java

@Model(
    adaptables = Resource.class,
    adapters = { CountryItem.class },
    defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL
)
public class CountryItemImpl implements CountryItem {
    @ValueMapValue
    String country;

    @ValueMapValue
    String language;

    @ValueMapValue
    String link;

    public String getCountry() {
        return country;
    }

    public String getLanguage() {
        return language;
    }

    public String getLink() {
        return link;
    }
}

CountryListImplTest.java

@ExtendWith(AemContextExtension.class)
public class CountryListImplTest {
    private final AemContext ctx = new AemContext(ResourceResolverType.JCR_MOCK);

    private CountryList countryList;

    @BeforeEach
    public void setup() {
        ctx.load().json(
            "/com/aem/demo/core/components/internal/models/v1/country-list.json",
            "/content"
        );

        ctx.currentResource("/content/country-list");
        countryList = Objects.requireNonNull(ctx.getService(ModelFactory.class))
            .createModel(ctx.request(), CountryListImpl.class);
    }

    
    public void getCountryListTest() {
        Assertions.assertNotNull(countryList);
//      countryList.getCountryList() --> ALWAYS RETURN NULL
//      Assertions.assertNotNull(countryList.getCountryList());
//      Assertions.assertEquals(
//        2, countryList.getCountryList().size()
//      );
    }
}

country-list.json

{
  "country-list": {
    "jcr:primaryType": "nt:unstructured",
    "sling:resourceType": "awcm-demo/components/country-list",
    "title": "Select ...",
    "countryItems": {
      "jcr:primaryType": "nt:unstructured",
      "item0": {
        "jcr:primaryType": "nt:unstructured",
        "country": "Austria",
        "link": "/content/aem-demo/at/de",
        "language": "German"
      },
      "item1": {
        "jcr:primaryType": "nt:unstructured",
        "country": "Canada",
        "link": "/content/aem-demo/ca/en",
        "language": "English"
      }
    }
  }
}

Mahedi_Sabuj · Accepted Answer

I've identified a simplified solution, and I only need to implement two modifications.

1. CountryListImpl: change adaptables to Resource.Class

@Model(
  adaptables = Resource.class,
  adapters = { CountryLinkButton.class },
  resourceType = CountryLinkButtonImpl.RESOURCE_TYPE,
  defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL
)
@Exporter(
  name = ExporterConstants.SLING_MODEL_EXPORTER_NAME,
  extensions = ExporterConstants.SLING_MODEL_EXTENSION
)
public class CountryLinkButtonImpl implements CountryLinkButton {
.....
}

2. CountryListImplTest: Update createModel

createModel(ctx.request().getResource(), CountryListImpl.class);

Reference: https://medium.com/@veena.vikraman19/aem-junit-for-simple-aem-component-with-multifield-2326f61c8982

Sady_Rifat · Answer

Hi @mahedi_sabuj ,Just checked your problem. You are using Sling Deligation Pattern, I have an article on how to write unit tests for this type of Sling Model: https://medium.com/@sadyrifat/aem-unit-test-case-for-sling-delegation-pattern-1f011b947fb3 The way you are approaching is somehow wrong and you will get trouble on this. By using this article your Unit test will be like this:   private final AemContext context = new AemContextBuilder(ResourceResolverType.JCR_MOCK).plugin(CORE_COMPONENTS).build();    private CountryList countryList;    @BeforeEach    void init() {        Resource pageResource = context.load().json("/com/aem-demo/core/internal/models/page.json", "/content/uk");        Page page = pageResource.getChild("en/product").adaptTo(Page.class);        Map<String, Object> jsonObject = TestUtils.getJsonObject("/com/aem-demo/core/internal/models/country-list.json");        context.currentResource(context.create().resource(page, "countryList", jsonObject));        countryList = context.request().adaptTo(CountryListImpl.class);    }    @Test    void countryList() {        assertNotNull(countryList);    } And most importantly your json will be this, {    "jcr:primaryType": "nt:unstructured",    "sling:resourceType": "awc-demo/components/country-list",    "title": "Select ...",    "countryItems": {        "jcr:primaryType": "nt:unstructured",        "item0": {            "jcr:primaryType": "nt:unstructured",            "country": "Austria",            "link": "/content/aem-demo/at/de",            "language": "German"        },        "item1": {            "jcr:primaryType": "nt:unstructured",            "country": "Canada",            "link": "/content/aem-demo/ca/en",            "language": "English"        }    }}  After running your code with this setup I am getting the clildresources.Hope this helps you.

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