J-Unit Framework

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J-Unit Framework
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What is xUnit?

• An automated unit test framework
• Provides the Driver for unit(s)
• Provides automatic test runs
• Provides automatic result checks
• Available for multiple languages
• cppUnit
• sUnit
• Junit

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Junit Terms

• Failure Expected
• Error Unexpected (Exception)
• TestCase Collection of method tests
• Test Fixture Object Reuse for multiple tests
• TestSuite Collection of Test Cases
• TestRunner Interface
• awt, swing,text

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Essential Classes

• junit.framework.TestCase
• Allows running multiple tests
• Does all counting and reporting of errors
• junit.framework.Assert
• A set of assert methods
• Test fails if the assert condition does not hold
• If a test fails it is counted and reported
• junit.framework.TestSuite
• A collection of tests
• Uses Java introspection to find all the methods
  start with "test and have void parameters.
• TestSuite's run method executes all the tests

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Class diagram
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Example, Complex Class
public class Complex int real_part int
imaginary_part public Complex(int r, int i)
real_partr imaginary_parti
public Complex() real_part0
imaginary_part0 public boolean
Equal(Complex c) boolean result false
if ((real_partc.get_r())
(imaginary_partc.get_i())) resulttrue
return result public Complex Add(Complex
c) Complex result new Complex(c.get_r()re
al_part,c.get_i()imaginary_part) return
result public int get_r() return
real_part public int get_i() return
imaginary_part
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Using Junit (Create Fixture)

• public class ComplexTest extends TestCase
• Complex c1
• Complex c2
• protected void setUp()
• c1 new Complex(7,3)
• c2 new Complex(12,6)
• protected void tearDown()

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Using Junit (Add Test Cases)

• public void testAdd()
• Complex result c1.Add(new Complex(5,3))
• assertEquals(result.get_r(),c2.get_r())
• assertEquals(result.get_i(),c2.get_i())
• public void testEqual()
• assertTrue(!c2.Equal(c1))
• assertTrue(c1.Equal(new Complex(7,3)))

assertNull, assertNotNull, assertSame
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Using Junit (Make Suite)

• public static Test suite()
• TestSuite suite new TestSuite()
• suite.addTest(new ComplexTest(testAdd))
• suite.addTest(new ComplexTest(testEqual))
• return suite

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Using Junit (Batch Invoke and Constructor)

• public static void main(String args)
• junit.textui.TestRunner.run(suite())
• public ComplexTest(String s)
• super(s)

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The Graphical UI
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UI on Failure
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What Junit does not do

• Figure out your tests for you
• Calculate any coverage criteria
• Test GUIs
• Except extensions
• JFCUnit
• Jemmy
• Pounder
• Abbot

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Administrative

• Download latest version from
• www.junit.org
• Setup classpath to junit.jar
• Include appropriate ui in main
• Import junit.framework.