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Lecture Software construction - Lab 10: Unit testing with JUnit

In this chapter, the following content will be discussed: Iterative software development, testing with JUnit, Junit (3.x and 4.x), JUnit 3.x for testing programs, framework elements, assert, TestSuite, test of “exceptions”, Junit in eclipse - Setup, from JUnit 3.x to 4.x. | Software Construction Lab 10 Unit Testing with JUnit SWAT 2010 Iterative Software development + system increment Prioritized functionalities Write acceptance tests Execute acceptance tests Write and execute unit tests “Executed after the development” “Written before” SWAT 2010 Testing with JUnit Junit is a unit test environment for Java programs developed by Erich Gamma and Kent Beck. Writing test cases Executing test cases Pass/fail? (expected result = obtained result?) Consists in a framework providing all the tools for testing. framework: set of classes and conventions to use them. It is integrated into eclipse through a graphical plug-in. Junit (3.x and 4.x) Test framework test cases are Java code test case = “sequence of operations +inputs + expected values” Test code testDoubleOf2(){ // doubleOf2(); // } Production code int doubleOf2(){ // } JUnit 3.x for testing programs JUnit tests “substitute the use of main() to check the program behaviour” All . | Software Construction Lab 10 Unit Testing with JUnit SWAT 2010 Iterative Software development + system increment Prioritized functionalities Write acceptance tests Execute acceptance tests Write and execute unit tests “Executed after the development” “Written before” SWAT 2010 Testing with JUnit Junit is a unit test environment for Java programs developed by Erich Gamma and Kent Beck. Writing test cases Executing test cases Pass/fail? (expected result = obtained result?) Consists in a framework providing all the tools for testing. framework: set of classes and conventions to use them. It is integrated into eclipse through a graphical plug-in. Junit (3.x and 4.x) Test framework test cases are Java code test case = “sequence of operations +inputs + expected values” Test code testDoubleOf2(){ // doubleOf2(); // } Production code int doubleOf2(){ // } JUnit 3.x for testing programs JUnit tests “substitute the use of main() to check the program behaviour” All we need to do is: write a sub-class of TestCase add to it one or more test methods run the test using JUnit junit.framework.* Framework elements TestCase Base class for classes that contain tests assert*() Method family to check conditions TestSuite Enables grouping several test cases Testsuite Testcase 2 Testcase 1 Testcase 3 An example import junit.framework.TestCase; public class StackTester extends TestCase { public StackTester(String name) { super(name); } public void testStack() { Stack aStack = new Stack(); if(!aStack.isEmpty()) { System.out.println(“Stack should be empty!”); aStack.push(10); aStack.push(-4); System.out.println(“Last element:“ + aStack.pop()); System.out.println(“First element: “ +aStack.pop()); } } Must begin with “test” class Stack { public boolean isEmpty(){ . } public void push(int i){ . } public int pop(){ . } } Assert*() They are public methods defined in the base class TestCase Their names begin with “assert” and are used in .