@Test
public void emptyUserMessage() throws Exception {

    final String EXCEPTION_MSG = "You should see this message";
    final String USER_MSG = "";
    showDialog(new IllegalArgumentException(EXCEPTION_MSG), USER_MSG);
    
    assertEquals("IllegalArgumentException", windowFixture.component().getTitle());
    
    JLabelFixture label = windowFixture.label();
    label.requireText(Pattern.compile(".*" + EXCEPTION_MSG + ".*"));
}