@Test
public void testValidateUserTypeWithMissingUserTypeParam() {

    Map<String, Object> userMap = new HashMap<>();
    try {
        userMap.put(JsonKey.USER_TYPE, "invalid");
        UserBulkUploadRequestValidator.validateUserBulkUploadRequest(userMap);
    } catch (Exception e) {
        Assert.assertEquals("Invalid userType: invalid. Valid values are: [TEACHER, OTHER].", e.getMessage());
    }
}