• September 4, 2014
  • JUnit
  • Comments Off on JUnit expected exception test

JUnit expected exception test

Expected exception test is used for the methods which can throw an exception. We have to specify expected exception in @Test(expected = expectedException.class) action. If expected exception or any of its subclass exception is thrown by the method then JUnit will pass this unit test.

Example:

DivisionTestCase.java

import com.javawithease.business.*;
import static org.junit.Assert.*;
import org.junit.Test;
 
/**
 * This is test case class for division method.
 * @author javawithease
 */
public class DivisionTestCase {
	//DivisionTest class objects
	DivisionTest divisionTest1 = new DivisionTest(10, 2); 
	DivisionTest divisionTest2 = new DivisionTest(10, 0); 
 
	//Test case for division
	@Test
	public void test() {
		assertEquals(5, divisionTest1.division());
	}
 
	//Test case for expected ArithmeticException, 
	//As in this case ArithmeticException
	// is the expected exception so JUnit 
	//will pass this unit test. 
	@Test(expected = ArithmeticException.class)  
	public void testException() {
		assertEquals(5, divisionTest2.division());
	}
}

DivisionTest.java

/**
 * This is simple java class containing division method.
 * @author javawithease
 */
public class DivisionTest {
	//data members
	int num1, num2;
 
	//parameterised constructor
	public DivisionTest(int num1, int num2){
		this.num1 = num1;
		this.num2 = num2;
	}
 
	//division method
	public int division() throws ArithmeticException{
		return num1/num2;
	}
}

Output:

junit2

 

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