@Test(expected = IllegalArgumentException.class)
 public void itThrowsSpecifiedExceptionOnBuild() {
   ImmutableSpecifiedException.builder().buildOrThrow(IllegalArgumentException::new);
 }
 @Test(expected = SampleRuntimeException.class)
 public void itThrowsExpectedConfiguredException() {
   ImmutableSpecifiedException.builder().build();
 }