@Test
public void validate() {

    DMNScenarioValidation validationSpy = spy(new DMNScenarioValidation() {
        @Override
        protected DMNModel getDMNModel(KieContainer kieContainer, String dmnPath) {
            return dmnModelMock;
        }
    });
    // Test 0 - skip empty or not GIVEN/EXPECT columns
    Simulation test0 = new Simulation();
    test0.getScesimModelDescriptor().addFactMapping(
            FactIdentifier.DESCRIPTION,
            ExpressionIdentifier.create(VALUE, FactMappingType.OTHER));
    test0.getScesimModelDescriptor().addFactMapping(
            FactIdentifier.EMPTY,
            ExpressionIdentifier.create(VALUE, FactMappingType.GIVEN));
    List<FactMappingValidationError> errorsTest0 = validationSpy.validate(test0, settingsLocal, null);
    checkResult(errorsTest0);
    // Test 1 - simple type
    Simulation test1 = new Simulation();
    test1.getScesimModelDescriptor().addFactMapping(
            FactIdentifier.create("mySimpleType", "tMYSIMPLETYPE"),
            ExpressionIdentifier.create(VALUE, FactMappingType.GIVEN));
    createDMNType("mySimpleType", "mySimpleType");
    List<FactMappingValidationError> errorsTest1 = validationSpy.validate(test1, settingsLocal, null);
    checkResult(errorsTest1);
    // Test 2 - nested field
    Simulation test2 = new Simulation();
    // nameFM is valid
    FactIdentifier myComplexFactIdentifier = FactIdentifier.create("myComplexType", "tMYCOMPLEXTYPE");
    FactMapping nameFM = test2.getScesimModelDescriptor().addFactMapping(
            myComplexFactIdentifier,
            ExpressionIdentifier.create("name", FactMappingType.GIVEN));
    nameFM.addExpressionElement("tMYCOMPLEXTYPE", "tMYCOMPLEXTYPE");
    nameFM.addExpressionElement("name", "tNAME");
    createDMNType("myComplexType", "myComplexType", "name");
    // parentFM is valid
    FactMapping parentFM = test2.getScesimModelDescriptor().addFactMapping(
            myComplexFactIdentifier,
            ExpressionIdentifier.create("parent", FactMappingType.EXPECT));
    parentFM.addExpressionElement("tMYCOMPLEXTYPE", "tMYCOMPLEXTYPE");
    parentFM.addExpressionElement("parent", "tPARENT");
    createDMNType("myComplexType", "myComplexType", "parent");
    List<FactMappingValidationError> errorsTest2 = validationSpy.validate(test2, settingsLocal, null);
    checkResult(errorsTest2);
    // parentFM is not valid anymore
    parentFM.addExpressionElement("notExisting", "notExisting");
    errorsTest2 = validationSpy.validate(test2, settingsLocal, null);
    checkResult(errorsTest2, "Impossible to find field 'notExisting' in type 'tPARENT'");
    // nameWrongTypeFM has a wrong type
    FactMapping nameWrongTypeFM = test2.getScesimModelDescriptor().addFactMapping(
            myComplexFactIdentifier,
            ExpressionIdentifier.create("parent2", FactMappingType.EXPECT));
    nameWrongTypeFM.addExpressionElement("tMYCOMPLEXTYPE", "tMYCOMPLEXTYPE");
    nameWrongTypeFM.addExpressionElement("name", Integer.class.getCanonicalName());
    errorsTest2 = validationSpy.validate(test2, settingsLocal, null);
    checkResult(errorsTest2,
                "Impossible to find field 'notExisting' in type 'tPARENT'",
                "Field type has changed: old 'java.lang.Integer', current 'tNAME'");
    // Test 3 - list
    Simulation test3 = new Simulation();
    // topLevelListFM is valid
    FactMapping topLevelListFM = test3.getScesimModelDescriptor().addFactMapping(
            FactIdentifier.create("myList", List.class.getCanonicalName()),
            ExpressionIdentifier.create("name", FactMappingType.GIVEN));
    topLevelListFM.addExpressionElement("tPERSON", List.class.getCanonicalName());
    topLevelListFM.setGenericTypes(Collections.singletonList("tPERSON"));
    createDMNType("myList", "person");
    when(mapOfMockDecisions.get("myList").getResultType().isCollection()).thenReturn(true);
    // addressesFM is valid
    FactMapping addressesFM = test3.getScesimModelDescriptor().addFactMapping(
            FactIdentifier.create("myComplexObject", "tMYCOMPLEXOBJECT"),
            ExpressionIdentifier.create("addresses", FactMappingType.EXPECT));
    addressesFM.addExpressionElement("tMYCOMPLEXOBJECT", "tMYCOMPLEXOBJECT");
    addressesFM.addExpressionElement("addresses", List.class.getCanonicalName());
    addressesFM.setGenericTypes(Collections.singletonList("tADDRESSES"));
    createDMNType("myComplexObject", "myComplexObject", "addresses");
    when(mapOfMockDecisions.get("myComplexObject").getResultType().getFields().get("addresses").isCollection()).thenReturn(true);
    List<FactMappingValidationError> errorsTest3 = validationSpy.validate(test3, settingsLocal, null);
    checkResult(errorsTest3);
    // Test 4 - not existing node
    Simulation test4 = new Simulation();
    FactMapping factMappingNodeRemoved = test4.getScesimModelDescriptor().addFactMapping(
            FactIdentifier.create("mySimpleType", "tMYSIMPLETYPE"),
            ExpressionIdentifier.create(VALUE, FactMappingType.GIVEN));
    factMappingNodeRemoved.addExpressionElement("tMYSIMPLETYPE", "tMYSIMPLETYPE");
    when(dmnModelMock.getDecisionByName(anyString())).thenReturn(null);
    List<FactMappingValidationError> errorsTest4 = validationSpy.validate(test4, settingsLocal, null);
    checkResult(errorsTest4, "Node type has changed: old 'tMYSIMPLETYPE', current 'node not found'");
}