Java JUnit Tutorial - JUnit Exceptions Test

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Junit can trace the Exception.

We can test whether the code throws desired exception or not.

The expected parameter is used along with @Test annotation.

Example

The following code shows how to use @Test annotation to mark a method expected exception.

import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestJunit {
/*from w  ww  .j av a 2s. c  o  m*/
  @Test(expected = ArithmeticException.class)
  public void testPrintMessage() {
    int a = 0;
    int b = 1 / a;
    assertEquals(0,b);
  }
}

Run

Here is the code to run the test case.

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
/*from   w w w.  j av  a  2  s  .com*/
public class Main {
   public static void main(String[] args) {
      Result result = JUnitCore.runClasses(TestJunit.class);
      for (Failure failure : result.getFailures()) {
         System.out.println(failure.toString());
      }
      System.out.println(result.wasSuccessful());
   }
}

The code above generates the following result.

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