@Test
public void testGetDrowpDown() {

    final String factType = "Car";
    final String factField = "color";
    final SingleFieldConstraint singleFieldConstraint = new SingleFieldConstraint() {{
        setFactType(factType);
        setFieldName(factField);
    }};
    final ConstraintValueEditor editor = spy(createEditor(singleFieldConstraint));
    // reset oracle due to calls in ConstraintValueEditor constructor
    reset(oracle);
    editor.initDropDownData();
    verify(oracle).getEnums(eq(factType), eq(factField), anyMap());
}