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Introduction to JUnit Eclipse

JUnit is an open-source java library; with the help of the JUnit library, we can perform the unit testing, or in other words, we can say that it is a unit testing framework. We can integrate JUnit with eclipse by adding the external jar file of JUnit. Basically, JUnit is used to test the small types of functionality, or we can say that a small module of an application is normally a single class. In JUnit, we perform the validation and verification of functionality that means developed functionality work as per the customer requirement or not that should be checked in JUnit. Basically, it is a java class library, but it is included in eclipse.

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JUnit Eclipse Overviews

Unit testing is a significant part of Test Driven Development (TDD) as it helps discover issues in the code as right on time as could be expected, particularly when you create changes to the current code you can run unit tests again to ensure that the progressions don’t break the application (that is regression testing). In addition, as a software engineer, you ought to compose and run unit tests to guarantee that your code meets its plan and acts as expected.

Test case structure in JUnit are as follows:

Suppose, for example; we have an arithmetic class as follows:

Code:

public class Arithmetic{ public int sum(int x, int y){ return x + y; } Public int mul(int x, int y){ return x * y; } }

Explanation:

Here we created an Arithmetic class, and it has two methods that sum() and mul() as shown in the above class.

Now we need to write the test script for the above class. But, first, we must ensure that the above class working is fine, and we need to follow the below structure in JUnit as follows.

Code:

import org.junit,*; public class ArithmeticTest{ @BeforeClass Public static void setup(){ } @Test public void testsum(){ } public void testmul(){ } @After public void teardown(){ } }

Explanation:

The above example shows how to write the test script in JUnit, basically providing the different notations as shown in the above code.

Using JUnit Eclipse

Now let’s see how we can use JUnit in eclipse as follows:

The first step is to add the external jar file into eclipse. After completion of the jar file, we need to extract that file as shown in the following screenshot as follows.

Now create a project and add this JUnit library into a created project, as shown in the following screenshot as follows.

Creating a JUnit in Eclipse

Now let’s create JUnit in eclipse as follows:

In the above point, we already seen how we can add jar files into an eclipse and how we can create the JUnit Test Case.

Example:

During the creation of the JUnit Test Case class, we need to assign the name of the class, and we select different notations for those we require, as shown in the following screenshot as follows.

First, create the demo class and write the following code as follows.

Code:

package day_1; public class demo { private String msg; public demo(String msg){ this.msg = msg; } public String DisplayMsg(){ System.out.println(msg); return msg; } }

Explanation:

In the above code, we created a demo class file and tried to print the message on the console with the help of this class.

Code:

package day_1; import org.junit.Test; import static org.junit.Assert.assertEquals; public class sample { String str = " Hi Welcome in JUni"; demo msgutil = new demo(str); @Test public void testPrintMessage() { assertEquals(str,msgutil.DisplayMsg()); } }

Explanation:

Output:

How to Set JUnit Eclipse?

Now let’s see how we can set JUnit in eclipse as follows:

After the successful installation of JUnit, we can access the JUnit library. There are two ways to set up the JUnit in eclipse maven and jar file.

So we need to follow some steps to set up the JUnit as follows:

First, we need to create the project into eclipse.

After that, we need to create the simple java class file and JUnit Test Case file.

Inside the Run, as an option, we have 1JUnit Test Command to run the JUnit Test Case class.

Conclusion

From the above article, we have taken in the essential idea of the JUnit eclipse, and we also saw the representation and example of the JUnit eclipse. From this article, we have seen how and when we use the JUnit eclipse.