Unit Test for Sling Model using JUnit

What is JUnit?

Java-specific unit testing framework JUnit was developed as an open-source project. It is used to create and execute repeated automated tests that assist programmers in finding and swiftly fixing flaws in their code.

Why do we need JUnit Framework?

• The Java programming language has an open-source unit testing framework called JUnit.
• It helps in ensuring that the code is error-free and that every component of the codebase is operating as intended.
• JUnit integrates with other development tools such as Eclipse and Maven.
• JUnit provides a structure for writing tests, including annotations to specify test methods, assertions for checking expected results, and rules for organizing and running tests.
• It gives Code Coverage to complete class/lines.

Which Api we will be using in Sling Model unit Test Case?

• io.wcm.testing.mock.aem.junit5.*
• org.mockito.junit.jupiter.*
• org.junit.jupiter.api.*

How to Write Junit Test case for Sling Model

• Folded Structure which is important while writing Unit TestCase

• Inside Core Module you will get src under src you will find two folder one is main and another is test.

Now let's see how to generate test case:

• I am using Eclipse Ide (integrated development environment) editor to write java code

 

• Inside test we have models folder, than click right click, than select New, than select other option. 

• Click on Other Option than search Junit and Select JunitTestCase.

• Write Name of class and add Test.java.

• Now, you have a Skeleton of Test class.
• Now you have to Add Aem Specific Libraries.
• You have a annotation is

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

• This Annotation allow you to use your own Api.

• Now I have to use Aem related Api

AemContext aemContext = new AemContext();

What is the meaning of @BeforeEach?

• This method will execute Before each method.
• used when different test cases share the same logic. The method with the @BeforeEach annotation always runs before the execution of each test case.
• This annotation is commonly used to develop necessary preconditions for each @Test method.
• 

aemContext.addModelsForClasses(rotationImpl.class);

• There is a method add Classes add Model for classes now, you have to mention your SlingModel.
• For this aemContext this is our Model.
• It means we will be Testing this Model.

Now we talked about resource or Component let's see how to create resource.

• As I have already discussed we should have json which contain all those properties and from this we will convert that json to resource.

Now we can see how to create json

• You can get it from Aem itself.
• Go to that page where it is and copy this path and go to Sling Exporter than paste copy path and Add .infinity.json.

• Whatever you will save in your Node all data are present in the form of json.

• Inside test folder resource folder is present than click right button select New and than select File and give name whatever you want and Add .json.
•  In created folder you copy the whole json here.

 

• I save properties as the value of a key.

• Now Load this Json 

aemContext.load().json("/rotation.json", "/component")

• aemContext.load().json present in "/component" path.

aemContext.currentResource("/component/rotation");

• It means the current resource means the component than what is the current resource /component.

• Our Run case is passed.

The Coverage is 100%.

Note:-The Coverage should be more than 50%.