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JUnit
TEAM SEGFAULT
ARJUN BHASIN
CHAKORI MACHERLA
GUNJAN RAGHAV
JAIDEEP SINGH
VICKY SEHRAWAT
What is JUnit?
 JUnit is a regression testing framework
 Used for unit testing framework in Java programs
 User interface for viewing test results


Text
GUI
 Integrated with several IDEs like Eclipse
 It is one of a family of unit testing frameworks collectively known as
xUnit that originated with SUnit.
Who developed JUnit?
 Written by Erich Gamma and Kent Beck.
 Used by developers to implement unit tests in Java
Why JUnit?
 Test framework provides tools for:




Assertions
Running tests
Aggregating Tests (suites)
Reporting Results
 Less reliance on time consuming debuggers
 JUnit improves our code quality
Features!
JUnit features include:
 Assertions for testing expected results
 Test fixtures for sharing common test data
 Test suites for easily organizing and running tests
 Graphical and textual test runners
Limitations
 Impossible to test a client/server environment, or
even a peer-to-peer scenario.
 We cannot perform distributed tests, so you don’t
have a way to run the same series of tests
simultaneously on several JVMs each running on
different Operating Systems.
A Quick
Demo!!
Setup and Teardown
 Setup:
Use the @Before annotation on a method containing code to run
before each test case.
 Teardown:
 Use the @After annotation on a method containing code to run after
each test case.
 These methods will run even if exceptions are thrown in the test case
or an assertion fails.
 It is allowed to have any number of these annotations.
 All methods annotated with @Before will be run before each test
case, but they may be run in any order.

Example: Using a file as a text fixture
public class OutputTest
{
private File output;
@Before public void createOutputFile()
{
output = new File(...);
}
@After public void deleteOutputFile()
{
output.delete();
}
@Test public void test1WithFile()
{
// code for test case objective
}
}
@Test public void test2WithFile()
{
// code for test case objective
}
Method execution order
1. createOutputFile()
2. test1WithFile()
3. deleteOutputFile()
4. createOutputFile()
5. test2WithFile()
6. deleteOutputFile()

Assumption: test1WithFile runs before
test2WithFile.
Adding Tests to TestCases
 Any method in a TestCase class is considered a test if
it begins with the word test

You can write many tests (have many test methods)
 Each test method should use a variety of assert
methods to test things about the state of their classes
under tests

Assert methods are inherited
Assert Methods
 Assert methods include:
 assertEqual(x,y)
 assertFalse(boolean)
 assertTrue(boolean)
 assertNull(object)
 assertNotNull(object)
 assetSame(firstObject, secondObject)
 assertNotSame(firstObject, secondObject)
Adding Two Tests to TestCase
package testing;
import junit.framework.TestCase;
public class FirstTestCase extends TestCase {
public FirstTestCase(String arg0) {
super(arg0);
}
public static void main(String[] args) {}
protected void setUp() throws Exception {
super.setUp();
}
protected void tearDown() throws Exception {
super.tearDown();
}
public void testCompareSucceed() {
assertEquals(0, 0); //this assertion will succeed
}
public void testCompareFail() {
assertEquals(0, 1); //this assertion will fail
}
}
Sources
 https://staff.ti.bfh.ch/fileadmin/home/due1/uml_d
p/JUnitTutorial-Williams-adapted.pdf
 http://vishnuagrawal.wordpress.com/2007/04/30/l
imitation-of-junit/
 http://en.wikipedia.org/wiki/JUnit
 http://www.junit.org/
Questions

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