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Mastering JUnit: Simple Framework for Writing Repeatable Tests

Learn about JUnit, a simple framework to create repeatable tests, including writing test cases, using fixtures, invoking test cases, running multiple tests, and collecting results.

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Mastering JUnit: Simple Framework for Writing Repeatable Tests

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  1. Topic: Junit Presenters: Govindaramanujam, Sama & Jansen, Erwin

  2. What is Junit? • It is a simple framework to write repeatable tests. • How to use it? • When you need to test something, here is what you do: • Create an instance of TestCase: • Create a constructor which accepts a String as a parameter and passes it to the superclass. • Override the method runTest() • When you want to check a value, call assertTrue() and pass a boolean that is true if the test succeeds

  3. A Simple Example To test that the sum of two Moneys with the same currency contains a value which is the sum of the values of the two Moneys, write: public void testSimpleAdd() { Money m12CHF= new Money(12, "CHF");    Money m14CHF= new Money(14, "CHF");     Money expected= new Money(26, "CHF");     Money result = m12CHF.add(m14CHF);    assertTrue(expected.equals(result));}

  4. What is a text fixture? • If tests need to run against the background of a known set of objects, the set of objects is called a test fixture. • When you have a fixture, here is what you do: • Create a subclass of TestCase • Create a constructor which accepts a String as a parameter and passes it to the superclass. • Add an instance variable for each part of the fixture • Override setUp() to initialize the variables • Override tearDown() to release any permanent resources you allocated in setUp

  5. An Example: To write several test cases that want to work with different combinations of 12 Swiss Francs, 14 Swiss Francs, and 28 US Dollars, first create a fixture: public class MoneyTest extends TestCase {      private Money f12CHF;      private Money f14CHF;       private Money f28USD;        protected void setUp() {          f12CHF= new Money(12, "CHF"); f14CHF= new Money(14, "CHF");    f28USD= new Money(28, "USD");      } }

  6. How do you write and invoke an individual test case when you have a Fixture? • Here is what you do: • Write the test case method in the fixture class. Be sure to make it public, or it can't be invoked through reflection. • Create an instance of the TestCase class and pass the name of the test case method to the constructor

  7. How do you run several tests at once? Use a Test Suite. An Example To create a suite of two test cases and run them together, execute: TestSuite suite= new TestSuite(); suite.addTest(new MoneyTest("testMoneyEquals")); suite.addTest(new MoneyTest("testSimpleAdd")); TestResult result= suite.run();

  8. How do you run your tests and collect their results? Use a Test Runner An Example public static Test suite() { TestSuite suite= new TestSuite();      suite.addTest(new MoneyTest("testMoneyEquals"));    suite.addTest(new MoneyTest("testSimpleAdd"));  return suite; }

  9. JUnit provides both a graphical and a textual version of a TestRunner tool. Start it by typing java junit.awtui.TestRunner Or junit.swingui.TestRunner.

  10. References • junit.org - a site for software developers using JUnit.

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