J-Unit Framework

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 …

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

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

Class diagram

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; }

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(){

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

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

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

The Graphical UI

UI on Failure

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

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