The “exception testing” means what exception throw from the unit test.

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import org.junit.*;
 
/**
 * JUnit Expected Exception Test
 * @author mkyong
 *
 */
public class JunitTest2 {
 
 
	@Test(expected = ArithmeticException.class)  
	public void divisionWithException() {  
	  int i = 1/0;
	}  
 
}

Result

Unit test marked success