1. J-Unit Framework

2. What is xUnit? An automated unit test framework
Provides the Driver for unit(s)
Provides automatic test runs
Provides automatic result checks
Available for multiple languages:
cppUnit
sUnit
Junit …

3. Junit Terms Failure: Expected Error: Unexpected (Exception)
TestCase: Collection of method tests
Test Fixture: Object Reuse for multiple tests
TestSuite: Collection of Test Cases
TestRunner: Interface
awt, swing,text

4. Essential Classes junit.framework.TestCase junit.framework.Assert
Allows running multiple tests
Does all counting and reporting of errors
junit.framework.Assert
A set of assert methods
Test fails if the assert condition does not hold
If a test fails it is counted and reported
junit.framework.TestSuite
A collection of tests
Uses Java introspection to find all the methods start with "test“ and have void parameters.
TestSuite's run method executes all the tests

5. Class diagram

6. Example, Complex Class
public class Complex {
int real_part;
int imaginary_part;
public Complex(int r, int i) {
real_part=r;
imaginary_part=i; }
public Complex() {
real_part=0;
imaginary_part=0;
public boolean Equal(Complex c) {
boolean result = false;
if ((real_part==c.get_r()) && (imaginary_part==c.get_i())) result=true;
return result;
public Complex Add(Complex c) {
Complex result = new Complex(c.get_r()+real_part,c.get_i()+imaginary_part);
public int get_r() { return real_part;}
public int get_i() { return imaginary_part; }

7. Using Junit (Create Fixture)
public class ComplexTest extends TestCase {
Complex c1;
Complex c2;
protected void setUp() {
c1 = new Complex(7,3);
c2 = new Complex(12,6); }
protected void tearDown(){

8. Using Junit (Add Test Cases)
public void testAdd() {
Complex result = c1.Add(new Complex(5,3));
assertEquals(result.get_r(),c2.get_r());
assertEquals(result.get_i(),c2.get_i()); }
public void testEqual(){
assertTrue(!c2.Equal(c1));
assertTrue(c1.Equal(new Complex(7,3)));
assertNull, assertNotNull, assertSame

9. Using Junit (Make Suite)
public static Test suite() {
TestSuite suite = new TestSuite();
suite.addTest(new ComplexTest(“testAdd”));
suite.addTest(new ComplexTest(“testEqual”));
return suite; }

10. Using Junit (Batch Invoke and Constructor)
public static void main(String[] args) {
junit.textui.TestRunner.run(suite()); }
public ComplexTest(String s) {
super(s);

11. The Graphical UI

12. UI on Failure

13. What Junit does not do: Figure out your tests for you
Calculate any coverage criteria
Test GUI’s
Except extensions:
JFCUnit
Jemmy
Pounder
Abbot

14. Administrative Download latest version from: www.junit.org
Setup classpath to junit.jar
Include appropriate ui in main
Import junit.framework.*