@Test
public void nullValueStandardizeAndValidate() {

    String fieldName = "field1";
    List<BaseFieldPolicy> policies = new ArrayList<>();
    policies.add(new SimpleRegexReplacer("(?i)foo", "bar"));
    policies.add(new LookupValidator("blah"));
    policies.add(new SimpleRegexReplacer("(?i)bar", "test"));
    policies.add(new LookupValidator("aatestaa"));
    FieldPolicy fieldPolicy = FieldPolicyBuilder.newBuilder().addPolicies(policies).tableName("emp").fieldName(fieldName).feedFieldName(fieldName).build();
    HCatDataType fieldDataType = HCatDataType.createFromDataType(fieldName, "string");
    StandardizationAndValidationResult result = validator.standardizeAndValidateField(fieldPolicy, null, fieldDataType, new HashMap<Class, Class>());
    assertEquals(StandardDataValidator.VALID_RESULT, result.getFinalValidationResult());
}