1. Unit Testing with JAVA
Dinuka Malalanayake
13-12-2011
“Any Unit Test is better than none”
© Cambio Healthcare Systems AB -1- 12-12-19

2. Objectives
• Unit testing?
• About JUnit
• How to do the Unit testing with JAVA
• Best Practices
• Advantages
• Disadvantages
• Similar Products
“Any Unit Test is better than none”
© Cambio Healthcare Systems AB -2- 12-12-19

3. Unit testing?
• A unit test is a procedure used to verify that a particular
module of source code is working properly
Mouse, Keyboard, Monitor
• Company wants to achieve three related goals
– Faster time-to-market
– Higher quality
– More flexibility
“Any Unit Test is better than none”
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4. About Junit
• Junit is an open source unit testing framework for JAVA.
• Junit has plugin for Eclipse, NetBeans.....etc.
• It serves the same purpose as NUnit does in the DotNet
Technologies, and is one of many in the xUnit family
“Any Unit Test is better than none”
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5. Making the Environment
• Download the eclipse
• Configure JUnit or Testng framework
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10. How to do the Unit testing with JAVA?
• Pre Requirement
– Source code
– Test Framework
– Test Methods
“Any Unit Test is better than none”
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11. Test Fixture in Junit
• import org.junit.*;
• @Test
• @Before
• @After
• @BeforeClass
• @AfterClass
• @Ignore….etc.
“Any Unit Test is better than none”
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12. Test Fixture in Testng
• import org.testng.*
• @Test
• @BeforeMethod
• @AfterMethod
• @BeforeClass
• @AfterClass
• @Test (enabled=false)….etc.
“Any Unit Test is better than none”
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13. Way of working in Junit
• @BeforeClass
– @Before
• @Test
– @After
– @Before
• @Test
– @After
• @AfterClass
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14. Way of working in Testng
• @BeforeClass
– @BeforeMethod
• @Test
– @AfterMethod
– @BeforeMethod
• @Test
– @AfterMethod
• @AfterClass
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15. Assertion
• import junit.framework.Assert;
• assertEquals
• assertFalse
• assertNotNull
• assertNotSame
• assertNull
• fail…etc.
“Any Unit Test is better than none”
© Cambio Healthcare Systems AB -15- 12-12-19

16. Steps for Unit testing
• Create JAVA Project by using the Eclipse
• Write the simple class
public class Account {
}
• Define the attributes and methods
• Create an Unit testing class
• Write down unit test code according to the specification
“Any Unit Test is better than none”
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17. Class Account
Type Name
float minimumBalance
float balance
Return type Name
void setMinimumBalanace(float minimumBalanace)
float getMinimumBalanace()
float deposit(float amount)
float getBalance()
void deposit(float amount)
void withdraw(float amount)
void calculateInterest(float interestRate)
void reSetAccount()
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20. Best Practices
• No conditional logic – Switch, if
• No loops
• Use appropriate method names
• Informative assertion message
• Separation per type
“Any Unit Test is better than none”
© Cambio Healthcare Systems AB -20- 12-12-19

21. Advantages
• Fast
• Test Isolation
• Environment Isolation – Use Mock Objects
• Unit testing gives you a safety net when programmers
re-factor or add functionality
• Unit tests can be used as documentation for other
programmers
• Development process becomes more flexible
“Any Unit Test is better than none”
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22. Disadvantages
• Unnecessary Unit Tests can lead to considerably high
maintenance cost to your overall project
“Any Unit Test is better than none”
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23. Similar Products
Programming Language Unit Testing Tool
C# NUnit
Java – J2ME JMUnit
C CUnit
C++ CppUnit
php PHPUnit
Python PyUnit / py.test
“Any Unit Test is better than none”
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24. Q&A
“Any Unit Test is better than none”
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25. THANK YOU
“Any Unit Test is better than none”
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