Unit Testing with JUnit Dan Fleck Fall 2007 (For both CS211 and
Download
Report
Transcript Unit Testing with JUnit Dan Fleck Fall 2007 (For both CS211 and
Unit Testing with JUnit
Dan Fleck
Fall 2007
(For both CS211 and
421…
two birds… one lecture!
:-)
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
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
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"));
}
Junit with Netbeans
1.
2.
3.
4.
New File
Choose file type: Junit
Choose Test for Existing Class
Junit test with all stubs
created for that class
5. Fill in the individual tests
6. Run Tests (Netbeans options)
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
Coverage Analysis with
Netbeans
Install Unit Test Code Coverage
Viewer module
Write a Unit Test
Run test and view highlighted
code
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);
}
How to write test cases
See sample system test case
See sample unit test case
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 nonfunctional requirement (sec 5)
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