FMI Workshop 2016 - CS 108 Bootcamp - Unit testing

Im zweiten Semester wartet auf die Informatikstudierenden an der
Universität Basel eines der Studien-Highlights: Das Gameprojekt. In
dieser anwednungsbezogenen Vorlesung werden in Gruppen von Studierenden
ein Multiplayerspiel in Java entwickelt. Im vierteiligen CS108 Bootcamp
werden Euch alle Aspekte der Softwareentwicklung erläutert, die für das
Programmierprojekt relevant sind.

Referent: Marcel Neidinger - m.neidinger (at) unibas.ch

Transcript

1. Don’t worry this ain’t spaghetti code Testing software products Marcel Neidinger m.neidinger (at) unibas.ch
2. -- Jacob Kaplan-Moss Code without tests is broken by design
3. Don’t be broken by design
4. Testing prevents angry customers
5. Testing prevents bad code quality
6. Testing prevents bugs
7. Testing prevents discussions
8. and Testing prevents wasted time
9. So it is pretty cool right?
10. So it is pretty cool right? Two ways of testing code
11. Test entire scenarios
12. Test one unit
13. Test what a software unit does by feeding it inputs of known outcome. Compare.
15. Unit tests test exactly one unit #1
16. Unit tests are orthogonal #2
17. Unit tests are order independant #3
18. Unit tests have descriptive names #4
19. Unit tests describe common knowledge #5
22. Implementing Unit tests • xUnit tests are the quasi standard for unit testing • jUnit provides an implementation for Java • InteliJ: Hover over @Test in Code and Alt+Enter • Eclipse: • Project > Properties > Java Build Path > Add Library > „JUnit“
23. Terminology of Unit tests • Code under test The unit that is being tested • Test fixture The fixed input of a test case we know the outcome • State testing Test code by validating it’s outcome • Mock Dummy implementation for an interface or class with defined output
24. Structure of Unit tests public class AdderTestSuite {
 private Adder adder; @BeforeClass public static void setup() { adder = new Adder(); }
 
 @Before
 public static void before() { adder.clearStack(); }
 
 @Test
 public statc void test_AddTwoPosIntegers()
 {
 assertEquals(adder.add(2,3), 5);
 } } Class-wise Setup Test-wise Setup Testcase
26. https://marcel.nlogn.org/fmi-workshop-16/unit-testing.zip