Przykład:

"Calculator.java"

public class Calculator
{
	public double add(double number1, double number2)
	{
		return number1 + number1;
	}
	
	public double mul(double number1, double number2)
	{
		return number1 * number2;
	}
}

import junit.framework.TestCase;

public class TestCalculator extends TestCase 
{

	public void testAdd() 
	{
		Calculator calculator = new Calculator(); 
		double result = calculator.add(10, 50); 
		assertEquals(60.0, result); 
	}
	
	public void testMul()
	{
		Calculator calculator = new Calculator();
		double result = calculator.mul(10, 17);
		assertEquals(170.0, result);
	}
}

Przykład:

public class Counter {

	protected int number;
	protected boolean countingIsStoped;
	
	public Counter()
	{
		countingIsStoped = false;
		number = 0;
	}
	
	public int getNumber()
	{
		return number;
	}
	
	public void next()
	{
		if(!countingIsStoped)
			number++;
	}
	
	public void stopCounting()
	{
		countingIsStoped = true;
	}
}

import junit.framework.TestCase;
import junit.framework.Test;
import junit.framework.TestSuite;

public class TestCounter extends TestCase {
	
	public TestCounter(String method)
	{
		super(method);
	}
	
	public void testNext()
	{
		Counter counter = new Counter();
		counter.next();
		int prev = counter.getNumber();
		counter.next();
		assertEquals(prev + 1, counter.getNumber());
	}
	
	public void testStopCounting()
	{
		Counter counter = new Counter();
		int prev = counter.getNumber();
		counter.stopCounting();
		assertEquals(prev, counter.getNumber());
	}
	
	public static Test suite() {
	    TestSuite suite = new TestSuite();
	    suite.addTest(new TestCounter("testNext"));
	    suite.addTest(new TestCounter("testStopCounting"));
	    return suite;
	}
}

import junit.framework.TestCase;
import junit.framework.Test;
import junit.framework.TestSuite;

public class MyTestSuite extends TestCase {
	
	public static Test suite() {
		TestSuite suite = new TestSuite();
		suite.addTestSuite(TestCounter.class);
		//suite.addTest(TestCounter.suite());
		suite.addTest(new TestCalculator("testAdd"));
		suite.addTest(new TestCalculator("testMul"));
		return suite;
	}
}

<junit printsummary="yes" haltonerror="yes" haltonfailure="no" fork="yes" showoutput="no">
  <formatter type="plain" usefile="no"/>
  <formatter type="xml"/>
  <test name="MyTestSuite" todir="${report.dir}" />
  <classpath>
    <pathelement location="${buil.dir}"/>
  </classpath>
</junit>

<junitreport todir="${report.dir}">
  <fileset dir="${report.dir}">
    <include name="TEST-*.xml"/>
  </fileset>
  <report todir="${report.dir}/html"/>
</junitreport>