Ravi Kant Soni

Senior Software Engineer

i-Admin , Bangalore

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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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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“

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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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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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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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SET ECLIPSE ENVIRONMENT

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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

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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JUNIT TEST OUTPUT

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JUNIT TEST OUTPUT

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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)

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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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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ASSERT EXAMPLE

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ANNOTATION

Annotations are like meta-tags

@Test

@Before

@After

@BeforeClass

@AfterClass

@Ignore 16

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ANNOTATION EXAMPLE

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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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PARAMETERIZED EXAMPLE

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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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SUITES EXAMPLE

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TESTING EXCEPTIONS

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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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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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