Junit5 shows always 0% coverage in Intellij

Question

Hi All,
I have created Junit5 class for the below code.
package com.test.core.models;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.Required;
import org.apache.sling.models.annotations.injectorspecific.Self;
import org.apache.sling.models.annotations.injectorspecific.SlingObject;
import org.apache.sling.settings.SlingSettingsService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import java.io.IOException;

@Model(adaptables = SlingHttpServletRequest.class)
public class RedirectionModel {
    @1961677
    private SlingHttpServletRequest request;

@SlingObject
    private SlingHttpServletResponse response;

@586265
    @Required
    private String redirectURL;
    @586265
    private SlingSettingsService slingSettingsService;
    private static final Logger log = LoggerFactory.getLogger(RedirectionModel.class);

@PostConstruct
    protected void init() {
        log.info("PageRedirectModel: init method");
        Resource resource ;
        resource = request.getResource();
        String redirectTarget = resource.getResourceResolver().map(request, redirectURL);
        log.info("redirectTarget Url {}",redirectTarget);
        if (redirectTarget != null && redirectTarget.startsWith("/content/")) {
            redirectTarget += ".html";

}
        try {
            log.info("in try");
            response.sendRedirect(redirectTarget);

} catch (IOException e) {
            log.error("[RedirectUtils] Failed to execute redirect", e);
        }
    }
}

Junit5 class
package com.test.core.models;

import com.day.cq.wcm.api.Page;
import io.wcm.testing.mock.aem.junit5.AemContext;
import io.wcm.testing.mock.aem.junit5.AemContextExtension;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.testing.mock.sling.servlet.MockSlingHttpServletRequest;
import org.apache.sling.testing.mock.sling.servlet.MockSlingHttpServletResponse;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.Mockito;

import static org.junit.jupiter.api.Assertions.*;
@ExtendWith(AemContextExtension.class)
public class RedirectionModelTest {

public RedirectionModel redirectionModel;
    private Page page;
    private Resource resource;
    private  String RedirectUrl;
    @Mock
    MockSlingHttpServletRequest request;
    @Mock
    MockSlingHttpServletResponse response;
    @BeforeEach
    public void setUp(AemContext context) throws Exception{
        RedirectUrl="/content/mykp/homepage";
        page = context.create().page("/content/mykp/en");
        resource = context.resourceResolver().getResource("/content/mykp/en");
        redirectionModel=resource.adaptTo(RedirectionModel.class);

}

@2785667
    public void init() {
        String redirectTarget = resource.getResourceResolver().map(request, this.RedirectUrl);
        if(redirectTarget.startsWith("/content")&& redirectTarget!=null) {
            redirectTarget += ".html";
        }
        assertEquals("/content/mykp/homepage.html",redirectTarget);

}
}
after run Test with code converge it is showing me always 0% in  IntelliJ.
did i miss anything?

Lokesh_Vajrala · Accepted Answer

We covered the 76.5% coverage but for our project we need 80% coverage.

Line number 40, 47 and 48 not be covered.

what we have to do for that?

@bhavi50 , You've to write test cases for negative/exception cases to get coverage for the uncovered lines. If you notice, the lines that are not covered in code coverage are the cases where you encounter the exception or when the path doesn't start with "/content".

Add a new test case by creating the page under a non-content path, for instance under /conf or /test, at that time if condition at line #40 is not satisfied and will be covered.

Lokesh_Vajrala · Answer

@bhavi50 Yes, you're missing a few things.

RedirectionModel is registered with SlingHttpServletRequest, but in the RedirectionModelTest class you're trying to adapt it from Resource, which will just return null model and init() method in Sling Model is never called.
redirectURL param is not set in the request to set the Required field for redirection.
init() method in test class is not really testing the RedirectionModel, instead it is testing some made up data within the method.

You can refer this code to properly unit test the model and which will give you the code coverage

import io.wcm.testing.mock.aem.junit5.AemContext;
import io.wcm.testing.mock.aem.junit5.AemContextExtension;
import org.apache.sling.api.resource.Resource;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;

import static org.junit.jupiter.api.Assertions.assertEquals;
@ExtendWith(AemContextExtension.class)
public class RedirectionModelTest {

    AemContext context = new AemContext();
    @BeforeEach
    public void setUp() throws Exception{

        context.create().page("/content/mykp/en");
        Resource resource = context.resourceResolver().getResource("/content/mykp/en");
        context.request().setAttribute("redirectURL", "/content/mykp/homepage");
        context.currentResource(resource);
        context.request().adaptTo(RedirectionModel.class);

    }

    @Test
    public void init() {
        assertEquals("/content/mykp/homepage.html",context.response().getHeader("location"));
    }
}

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