Writing JUnit Test Case

Dear Folks,

In this blog I'll tell how to write the JUnit Test Cases to test your application's methods.

Suppose we have a class which manipulates with the date and time. See the sample class:

package com.test.util;

import java.util.Calendar;

public class DateManipulation {
    public static String getDate() {
        Calendar c = new  Calendar ();
        return c.getTime().toString();
    }
}

Now, we will write a test case of this method.

* Create a directory src_test parallel to src directory in your project.

* Now create the same package in it as your original src file.

* Create a class file TestDateManipulation in it.

package com.test.util;

import org.jmock.Mockery;
import org.jmock.integration.junit4.JMock;
import org.jmock.integration.junit4.JUnit4Mockery;
import org.jmock.lib.legacy.ClassImposteriser;
import org.junit.Test;
import org.junit.runner.RunWith;
import static org.junit.Assert.assertTrue;

@RunWith(JMock.class)
public class TestDateManipulation {
    
    private Mockery context = new JUnit4Mockery() {    
        {
            setImposteriser(ClassImposteriser.INSTANCE);
        }
    };

    @Test
    public void getDate(){
        String returnValue =  DateManipulation.getDate();
        assert returnValue != null;
        assertTrue(!returnValue.equals(""));
    }
}

* Use @Test annotation to show this is a JUnit Test method which is called to test the existing method.

* Mockery is mandatory to create otherwise it will give "no Mockery found in test class" error.

* assertTrue will validate the output of the program by evaluating the condition written in it. You can learn more about them in http://www.junit.org/apidocs/junit/framework/TestCase.html link.

Hope this will help you in writing test cases for your application. :)

--

Best regards,