The document provides an overview of JUnit, a widely used framework for unit testing in Java, detailing its features, setup, and creating unit test cases. It highlights important components such as annotations, assertions, parameterized tests, and suites, emphasizing the significance of structured testing. Additional resources are mentioned for further exploration of JUnit functionalities.

1. Ravi Kant Soni
Senior Software Engineer
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2. WHAT IS TESTING
Testing is the process of checking the
functionality of the application whether it
is working as per requirements
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3. WHAT IS JUNIT
DeFacto framework for developing unit
test in java
 Currently version 4.x
Developed by Erich Gamma & Kent Beck
Released under IBM, and hosted on
sourcefog
Promotes the idea of "first testing then
coding“ 3
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4. FEATURES OF JUNIT
An open source framework which is used
for writing & running tests
Shows test progress in a bar that is green
if test is going fine and it turns red when a
test fails
Provides Annotation & Assertions
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5. WHAT IS UNIT TEST CASES?
Unit testing is the testing of single entity
(class or method)
A Unit Test Case is a part of code which
ensures that the another part of code
(method) works as expected
There must be at least two test cases for
each requirement: one positive test and
one negative test 5
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6. JUNIT ENVIRONMENT SETUP
JUnit is a framework for Java, so the very
first requirement is to have JDK installed
in your machine.
Download latest version of JUnit jar file
from http://www.junit.org.
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7. SET ECLIPSE ENVIRONMENT
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8. JUNIT 4
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Automatically recognizes test methods
preceded by @Test annotation
No need for main() to run the tests
Test methods must be public, void, with
no parameters

9. EXAMPLE
import org.junit.Test; // for @Test
import static org.junit.Assert.assertEquals; // assertEquals()
public class TestJunit {
@Test
public void testAdd() {
assertEquals(2, 2 + 1);
}
}
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10. JUNIT TEST OUTPUT
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11. JUNIT TEST OUTPUT
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12. JUNIT TEST OUTPUT
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Runs
Total number of tests run
Failures
Tests that failed. For example assertions that
failed.
Errors
Tests that generated unhandled (unexpected)
exceptions.
Time elapsed (ms)

13. JUNIT CLASSES
JUnit classes are important classes which is
used in writing and testing Junits
Assert which contain a set of assert
methods
TestCase which contain a test case defines
the fixture to run multiple tests
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14. ASSERT
org.junit.Assert.* static methods:
 void assertEquals(expected, actual)
 Works with object, int, long, byte, string, etc
 Object: it invokes object.equals(object) for equality
 assertEquals (expected, actual, εpsilon)
 float and double
 void assertFalse/ True(boolean condition)
 void assertNull/ NotNull(Object object)
 void fail() 14
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15. ASSERT EXAMPLE
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16. ANNOTATION
Annotations are like meta-tags
 @Test
 @Before
 @After
 @BeforeClass
 @AfterClass
 @Ignore
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17. ANNOTATION EXAMPLE
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18. PARAMETERIZED TEST
 Allows you to run the same test with different
data
 @RunWith(Parameterized.class)
 public static method that returns a Collection
of data
 Collection must be an Array of the various
parameters used for the test
 public constructor that uses the parameters 18
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19. PARAMETERIZED EXAMPLE
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20. SUITES
 Specify an execution order
 Add @Suite to an empty class
@RunWith(Suite.class)
@Suite.SuiteClasses({SomeTest.class})
public class AllTests { }
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21. SUITES EXAMPLE
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22. TESTING EXCEPTIONS
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23. GOOD UNIT TEST
 Any static utility method must have test
 Make exception tests
 Business models with equals and hashcode
 Test that “something is true” but also that
“not-something is false”
 Give your tests meaningful names
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24. MORE RESOURCE
 Official site: www.junit.org
 JUnit cook book
http://junit.sourceforge.net/doc/cookbook
/cookbook.htm (one recipe long!)
 JUnit Javadoc:
http://junit.org/junit/javadoc/4.5/
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