JUnit is a framework for Java, so the very first requirement is to have JDK installed in your machine. 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

1. Ravi Kant Soni
Senior Software Engineer
i-Admin , Bangalore
i-Admin,Bangalore
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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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