JUnit test and Project 3 simulation

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JUnit

The testing problemsThe framework of JUnitA case study

Acknowledgement: using some materials from JUNIT tutorial by Hong Qing Yu (www.cs.le.ac.uk/people/hqy1)

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The Testing Problems

programmers

Should write

few

Do

Why?

I am so busy

It is difficult

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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 won't run, then write the code that will make it run.”

JUnit is that kind of tool!

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JUnit

The testing problems The framework of JUnitA case study

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The Framework of JUnit

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JUnit

The testing problemsThe framework of JUnitA case study

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A Case Study

Lab3Queue:enQueue methoddeQueue method

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Include junit library in eclipse

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How to Write A TestCase using Junit (available in Eclipse 3.1 or later)

Step 1:Create a JUNIT test case (File -> New -> Junit Test Case

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Create a test case

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Create a test case

import junit.framework.*;public class Lab3QueueTest {

public void setUp() throws Exception {}

public void tearDown() throws Exception {}

}

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Create a test case

import junit.framework.*;public class Lab3QueueTest extends TestCase {

Lab3Queue testQueue;int queueSize;public void setUp() throws Exception {

testQueue = new Lab3Queue();queueSize = testQueue.getSize();

}

public void tearDown() throws Exception {}

}

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Create a test case

For each method that you are going to test:Write a corresponding test method named:

test<method name> in the test case

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Create a test case

public void testenQueue() {int newItem = 1;queueSize = testQueue.getSize();testQueue.enQueue(newItem);Assert.assertEquals(queueSize+1, testQueue.getSize());int actualItem = ((Integer) testQueue.getLastNode()).intValue();Assert.assertEquals(newItem, actualItem);

}

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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)

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Structure

setUp() Storing the fixture's objects in instance variables of your

TestCase subclass and initialize them by overriding the setUp method

tearDown() Releasing the fixture’s

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Writing a test suite

Step 2: Create a test suite by choosing

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Writing a test suite

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Writing a test suite

import junit.framework.Test;import junit.framework.TestSuite;public class AllTests {

public static Test suite() {TestSuite suite = new TestSuite("Test for

AiportSimulation");//$JUnit-BEGIN$suite.addTestSuite(Lab3QueueTest.class);//$JUnit-END$return suite;

}}

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Running a test

AllTests -> choose Run -> Run As -> Junit Test

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Running a test

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Design Test Cases

The real world scenarios The number boundaries

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TipsTestcases must extend TestCaseAll ‘test’ methods must include at least one call toan assert method or to fail:

assertEquals (String message, ...)assertNotNull (String message, Object obj)assertNull (String message, Object obj)assertSame (String message, Obj exp, Obj

actual)assertTrue (String message, boolean condition)fail (String message)

Remove System.out.println after test cases are working and rely on Junit assert methods to determine success/failure.

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Dynamic Run

Since JUnit 2.0 there is an even simpler dynamic way. You only pass the class with the tests to a TestSuite and it extracts the test methods automatically.

suite.addTestSuite(Lab3QueueTest.class);

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Project 3 - Algorithm