Juni开发教程.ppt

JUnit Tutorial Hong Qing Yu Nov 2005 JUnit Tutorial The testing problems The framework of JUnit A case study JUnit tool Practices The Testing Problems The Testing Problems Programmers need such kind of tool: “Writing a few lines of code, then a test that should run, or even better, to write a test that wont run, then write the code that will make it run.” JUnit Tutorial The testing problems The framework of JUnit A case study JUnit tool Practices The Framework of JUnit JUnit Tutorial The testing problems The framework of JUnit A case study JUnit tool Practices A Case Study } How to Write A TestCase public class MoneyTest extends TestCase { ??? //… ??? public void testSimpleAdd() { ??????? Money m12CHF= new Money(12, CHF);? //?(1) ??????? Money m14CHF= new Money(14, CHF); ???????? ??????? Money expected= new Money(26, CHF); ??????? Money result= m12CHF.add(m14CHF);??? //?(2) ??????? Assert.assertTrue(expected.equals(result));???? //?(3) ??? } } (1) Creates the objects we will interact with during the test. This testing context is commonly referred to as a tests fixture. All we need for the testSimpleAdd test are some Money objects. (2) Exercises the objects in the fixture. (3) Verifies the result Assert assertEquals(expected, actual) assertEquals(message, expected, actual) assertEquals(expected, actual, delta) assertEquals(message, expected, actual, delta) assertFalse(condition) assertFalse(message, condition) Assert(Not)Null(object) Assert(Not)Null(message, object) Assert(Not)Same(expected, actual) Assert(Not)Same(message, expected, actual) assertTrue(condition) assertTrue(message, condition) Structure setUp() Storing the fixtures objects in instance variables of your TestCase subclass and initialize them by overriding the setUp method tearDown() Releasing the fixture’s run() Defining how to run an individual test case.