@Test
public void testOperatorPlaceholderSelectedWhenNothingSelectedPreviously() {

    registerFakeProvider();
    when(plugin.getFactField()).thenReturn("factField");
    when(plugin.operatorPlaceholder()).thenReturn("please choose");
    mockGetOperatorCompletionsToReturn(OperatorsOracle.STANDARD_OPERATORS);
    spyOperatorsDropdown();
    mockListBox("please choose",
                "equal to");
    page.operatorDropdown(widget -> {
        assertTrue(widget instanceof CEPOperatorsDropdown);
        final CEPOperatorsDropdown operatorsDropdown = (CEPOperatorsDropdown) widget;
        verify(operatorsDropdown.getBox()).setSelectedIndex(0);
    });
}