JUnit test to demonstrate the handling of exceptions.

ExceptionHandlingTest.java

public class ExceptionHandlingTest {

  @Rule
  public ExpectedException thrown = ExpectedException.none();

  @Test(expected = IndexOutOfBoundsException.class)
  public void shouldFailForInvalidIndex() throws Exception {
    new ArrayList<>().get(0);
  }

  @Test
  public void shouldFailForInvalidIndexWithTryCatch() throws Exception {
    try {
      new ArrayList<>().get(0);
      fail("Expected an IndexOutOfBoundsException to be thrown");
    } catch (IndexOutOfBoundsException e) {
      assertThat(e.getMessage()).isEqualTo("Index: 0, Size: 0");
    }
  }

  @Test
  public void shouldFailForInvalidIndexWithExpectedException() throws Exception {
    thrown.expect(IndexOutOfBoundsException.class);
    thrown.expectMessage("Index: 0, Size: 0");
    new ArrayList<>().get(0); // execution will never get past this line
  }
}