1. Unit Testing with JUnit
Dan Fleck
Fall 2007
(For both CS211 and 421…
two birds… one lecture! :-)

2. What is Unit Testing?
A procedure to validate individual units of Source Code
Example: A procedure, method or class
Validating each individual piece reduces errors when integrating the pieces together later

3. Automated Unit Tests with JUnit
Junit is a unit testing framework for Java
Allows you to write unit tests in Java using a simple interface
Automated testing enables running and rerunning tests very easily and quickly

4. An example unit test
public void testCellChangePropagates() { Spreadsheet sheet =
new Spreadsheet();
sheet.put("A1", "5");
sheet.put("A2", "=A1");
sheet.put("A1", "10");
assertEquals("10",sheet.get("A2")); }

5. Junit with Netbeans New File Choose file type: Junit
Choose Test for Existing Class
Junit test with all stubs created for that class
Fill in the individual tests
Run Tests (Netbeans options)

6. Coverage Analysis
Determining which lines of code your tests have exercised and which they have not
Allows you to detect if your unit tests (or system tests) are adequately covering all possibilities or not
This is just one way to test

7. Coverage Analysis with Netbeans
Install Unit Test Code Coverage Viewer module
Write a Unit Test
Run test and view highlighted code

8. A simple test to dynamically cover your code:
public void testMain() {
SuDoku sFrame = new SuDoku();
while (sFrame.isDisplayable()) {
try {
Thread.sleep(100);
} catch (Exception e) {
e.printStackTrace(); }
Assert.assertEquals(true,true);

9. How to write test cases See sample system test case
See sample unit test case

10. Class Exercise - Lets try it out!
Using the SystemRequirementsSpecificationExample.doc
Each team pick a use case
Document the overall system or unit tests you would write to test
Do the same for a non-functional requirement (sec 5)

11. Summary Unit tests can help test the details of your program
Automated unit tests provide constant visibility and easy retesting
Test coverage supplies valuable information when running both unit tests and system tests