@Test
public void testFilterOptionsForConstraintTypeLiteralWhenConstraintValueIsFormula() {

    when(plugin.constraintValue()).thenReturn(BaseSingleFieldConstraint.TYPE_RET_VALUE);
    final String[] result = page.filterOptionsForConstraintTypeLiteral(OperatorsOracle.EXPLICIT_LIST_OPERATORS);
    final List<String> operators = Arrays.asList(result);
    assertEquals(0, operators.size());
}