@Test
public void testGetDropDown() throws Exception {

    final String fact = "Fact";
    final String field = "field";
    final AsyncPackageDataModelOracle oracle = mock(AsyncPackageDataModelOracle.class);
    final RuleModeller ruleModeller = mock(RuleModeller.class);
    doReturn(oracle).when(ruleModeller).getDataModelOracle();
    final String variableDefinition = "varName:type:" + fact + "." + field;
    final DSLSentence dslSentence = mock(DSLSentence.class);
    final DSLVariableValue dslVariableValue = mock(DSLVariableValue.class);
    final boolean isMultipleSelect = false;
    final Callback<DSLDropDown> updateEnumsCallback = mock(Callback.class);
    testedDropDown = new DSLDropDown(ruleModeller,
                                     variableDefinition,
                                     dslSentence,
                                     dslVariableValue,
                                     isMultipleSelect,
                                     updateEnumsCallback);
    // reset oracle due to calls in DSLDropDown constructor
    reset(oracle);
    testedDropDown.getDropDownData();
    verify(oracle).getEnums(eq(fact), eq(field), anyMap());
}