JUnit

JUnit

JUnit is an open source unit testing framework for writing repeatable tests.

Site: http://junit.org/

Test

Simple JUnit 4 Test:

@Test public void simpleAdd() {

assertTrue(2+2,4);

}

Fixtures

Test fixtures are the objects which are shared by multiple tests.

e.g. Database connection, Class instances

public class MoneyTest {

private Person person;

@Before public void setUp() {

person= new Person("Ritesh", 24, true);

}

}

Exceptions

For testing functions which need to be tested for expected Exceptions:

@Test(expected= IndexOutOfBoundsException.class) public void empty() {

new ArrayList<Object>().get(0);

}

Running Test

• JUnit Console tool:

org.junit.runner.JUnitCore.runClasses(TestClass1.class, ...);

• Eclipse inbuilt tool

Test Suite

Create empty class with following annotations:

@RunWith(Suite.class)

@SuiteClasses({

AdditonTest.class,

MultiplicationTest.class

})

public class AllRetrivalTests {

}

Testing Web Application

Cactus is an open source JUnit extension for testing Web application i.e. Servlet and JSP’s.

Struts:

1. http://www.onjava.com/pub/a/onjava/2004/09/22/test-struts.html
2. http://depressedprogrammer.wordpress.com/2007/06/18/unit-testing-struts-2-actions-spring-junit/
3. http://www.rkcole.com/articles/struts/crudTutorial/step1.html#createUnitTestClasses

Hibernate:

1. http://today.java.net/pub/a/today/2005/10/11/testing-hibernate-mapping.html

Reference:

1. http://junit.sourceforge.net/
2. http://www.ibm.com/developerworks/java/library/j-junit4.html?ca=dgr-lnxw01JUnit4

Usage

• Tests should be written before the code. Test-first programming.
• Test only the code that can break
• Run unit tests often, ideally every time you change the code