diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..b2b8866
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,7 @@
+{
+    "python.testing.pytestArgs": [
+        "test"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
+}
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index e8dfcdd..0422b39 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,7 @@ requires-python = ">=3.13"
 dependencies = [
     "generateds>=2.44.3",
     "lxml>=6.0.1",
+    "pytest>=8.4.2",
     "ruff>=0.13.1",
     "xsdata-pydantic[cli,lxml,soap]>=24.5",
     "xsdata[cli,lxml,soap]>=25.7",
diff --git a/src/main.py b/src/main.py
index 0383495..c2a4ade 100644
--- a/src/main.py
+++ b/src/main.py
@@ -6,7 +6,7 @@ from datetime import datetime, timezone
 import re
 from xsdata_pydantic.bindings import XmlSerializer
 
-from simplified_access import CustomerData, CustomerFactory, PhoneTechType
+from simplified_access import CustomerData, CustomerFactory, PhoneTechType, ResGuestFactory
 
 
 
@@ -59,31 +59,12 @@ def main():
         language="en"
     )
 
-    retrieve_customer = CustomerFactory.create_retrieve_customer(customer_data)
+    
 
-    profile = ab.OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests.ResGuest.Profiles.ProfileInfo.Profile(
-        customer=retrieve_customer
-    )
+    res_guests = ResGuestFactory.create_retrieve_res_guests(customer_data)
 
-    # Use the actual nested Profiles class
+   
 
-    profile_info = ab.OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests.ResGuest.Profiles.ProfileInfo(
-        profile=profile
-    )
-
-    profiles = ab.OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests.ResGuest.Profiles(
-        profile_info=profile_info
-    )
-
-    # ResGuest
-    res_guest = (
-        ab.OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests.ResGuest(
-            profiles=profiles
-        )
-    )
-    res_guests = ab.OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests(
-        res_guest=res_guest
-    )
 
     # Use the actual nested HotelReservationIds class
     hotel_res_ids = ab.OtaResRetrieveRs.ReservationsList.HotelReservation.ResGlobalInfo.HotelReservationIds(
diff --git a/src/output.xml b/src/output.xml
index 5dc9741..a54d587 100644
--- a/src/output.xml
+++ b/src/output.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <OTA_ResRetrieveRS xmlns="http://www.opentravel.org/OTA/2003/05" Version="7.000">
   <ReservationsList>
-    <HotelReservation CreateDateTime="2025-09-24T12:47:54.728936+00:00" ResStatus="Requested" RoomStayReservation="true">
+    <HotelReservation CreateDateTime="2025-09-24T13:06:48.996519+00:00" ResStatus="Requested" RoomStayReservation="true">
       <UniqueID Type="14" ID="6b34fe24ac2ff811"/>
       <RoomStays>
         <RoomStay>
diff --git a/src/simplified_access.py b/src/simplified_access.py
index e5f11b1..336c53a 100644
--- a/src/simplified_access.py
+++ b/src/simplified_access.py
@@ -191,6 +191,78 @@ class CustomerFactory:
         )
 
 
+# Define type aliases for ResGuests types
+NotifResGuests = OtaHotelResNotifRq.HotelReservations.HotelReservation.ResGuests
+RetrieveResGuests = OtaResRetrieveRs.ReservationsList.HotelReservation.ResGuests
+
+
+class ResGuestFactory:
+    """Factory class to create complete ResGuests structures with a primary customer."""
+    
+    @staticmethod
+    def create_notif_res_guests(customer_data: CustomerData) -> NotifResGuests:
+        """Create a complete ResGuests structure for OtaHotelResNotifRq with primary customer."""
+        return ResGuestFactory._create_res_guests(
+            NotifResGuests, 
+            NotifCustomer, 
+            customer_data
+        )
+    
+    @staticmethod
+    def create_retrieve_res_guests(customer_data: CustomerData) -> RetrieveResGuests:
+        """Create a complete ResGuests structure for OtaResRetrieveRs with primary customer."""
+        return ResGuestFactory._create_res_guests(
+            RetrieveResGuests, 
+            RetrieveCustomer, 
+            customer_data
+        )
+    
+    @staticmethod
+    def _create_res_guests(res_guests_class: type, customer_class: type, customer_data: CustomerData) -> Any:
+        """Internal method to create complete ResGuests structure."""
+        
+        # Create the customer using the existing CustomerFactory
+        customer = CustomerFactory._create_customer(customer_class, customer_data)
+        
+        # Create Profile with the customer
+        profile = res_guests_class.ResGuest.Profiles.ProfileInfo.Profile(
+            customer=customer
+        )
+        
+        # Create ProfileInfo with the profile
+        profile_info = res_guests_class.ResGuest.Profiles.ProfileInfo(
+            profile=profile
+        )
+        
+        # Create Profiles with the profile_info
+        profiles = res_guests_class.ResGuest.Profiles(
+            profile_info=profile_info
+        )
+        
+        # Create ResGuest with the profiles
+        res_guest = res_guests_class.ResGuest(
+            profiles=profiles
+        )
+        
+        # Create ResGuests with the res_guest
+        return res_guests_class(
+            res_guest=res_guest
+        )
+    
+    @staticmethod
+    def extract_primary_customer(res_guests: Union[NotifResGuests, RetrieveResGuests]) -> CustomerData:
+        """Extract the primary customer data from a ResGuests structure."""
+        
+        # Navigate down the nested structure to get the customer
+        customer = res_guests.res_guest.profiles.profile_info.profile.customer
+        
+        # Use the existing CustomerFactory conversion method
+        if isinstance(res_guests, NotifResGuests):
+            return CustomerFactory.from_notif_customer(customer)
+        else:
+            return CustomerFactory.from_retrieve_customer(customer)
+
+
 # Usage examples
 if __name__ == "__main__":
     # Create customer data using simple data class
@@ -227,4 +299,23 @@ if __name__ == "__main__":
     print("Converted back to data:", converted_data.given_name, converted_data.surname)
     
     # Verify they contain the same information
-    print("Original and converted data match:", customer_data == converted_data)
\ No newline at end of file
+    print("Original and converted data match:", customer_data == converted_data)
+    
+    print("\n--- ResGuestFactory Examples ---")
+    
+    # Create complete ResGuests structure for OtaHotelResNotifRq - much simpler!
+    notif_res_guests = ResGuestFactory.create_notif_res_guests(customer_data)
+    print("Created NotifResGuests with customer:", 
+          notif_res_guests.res_guest.profiles.profile_info.profile.customer.person_name.given_name)
+    
+    # Create complete ResGuests structure for OtaResRetrieveRs - much simpler!
+    retrieve_res_guests = ResGuestFactory.create_retrieve_res_guests(customer_data)
+    print("Created RetrieveResGuests with customer:", 
+          retrieve_res_guests.res_guest.profiles.profile_info.profile.customer.person_name.given_name)
+    
+    # Extract primary customer data back from ResGuests structure
+    extracted_data = ResGuestFactory.extract_primary_customer(retrieve_res_guests)
+    print("Extracted customer data:", extracted_data.given_name, extracted_data.surname)
+    
+    # Verify roundtrip conversion
+    print("Roundtrip conversion successful:", customer_data == extracted_data)
\ No newline at end of file
diff --git a/test/test_simplified_access.py b/test/test_simplified_access.py
new file mode 100644
index 0000000..bda40e0
--- /dev/null
+++ b/test/test_simplified_access.py
@@ -0,0 +1,348 @@
+import pytest
+from typing import Union
+import sys
+import os
+
+# Add the src directory to the path so we can import our modules
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'src'))
+
+from simplified_access import (
+    CustomerData, 
+    CustomerFactory, 
+    ResGuestFactory,
+    PhoneTechType,
+    NotifCustomer,
+    RetrieveCustomer,
+    NotifResGuests,
+    RetrieveResGuests
+)
+
+
+@pytest.fixture
+def sample_customer_data():
+    """Fixture providing sample customer data for testing."""
+    return CustomerData(
+        given_name="John",
+        surname="Doe",
+        name_prefix="Mr.",
+        name_title="Jr.",
+        phone_numbers=[
+            ("+1234567890", PhoneTechType.MOBILE),
+            ("+0987654321", PhoneTechType.VOICE),
+            ("+1111111111", None)
+        ],
+        email_address="john.doe@example.com",
+        email_newsletter=True,
+        address_line="123 Main Street",
+        city_name="Anytown",
+        postal_code="12345",
+        country_code="US",
+        address_catalog=False,
+        gender="Male",
+        birth_date="1980-01-01",
+        language="en"
+    )
+
+
+@pytest.fixture
+def minimal_customer_data():
+    """Fixture providing minimal customer data (only required fields)."""
+    return CustomerData(
+        given_name="Jane",
+        surname="Smith"
+    )
+
+
+class TestCustomerData:
+    """Test the CustomerData dataclass."""
+    
+    def test_customer_data_creation_full(self, sample_customer_data):
+        """Test creating CustomerData with all fields."""
+        assert sample_customer_data.given_name == "John"
+        assert sample_customer_data.surname == "Doe"
+        assert sample_customer_data.name_prefix == "Mr."
+        assert sample_customer_data.email_address == "john.doe@example.com"
+        assert sample_customer_data.email_newsletter is True
+        assert len(sample_customer_data.phone_numbers) == 3
+    
+    def test_customer_data_creation_minimal(self, minimal_customer_data):
+        """Test creating CustomerData with only required fields."""
+        assert minimal_customer_data.given_name == "Jane"
+        assert minimal_customer_data.surname == "Smith"
+        assert minimal_customer_data.phone_numbers == []
+        assert minimal_customer_data.email_address is None
+        assert minimal_customer_data.address_line is None
+    
+    def test_phone_numbers_default_initialization(self):
+        """Test that phone_numbers gets initialized to empty list."""
+        customer_data = CustomerData(given_name="Test", surname="User")
+        assert customer_data.phone_numbers == []
+
+
+class TestCustomerFactory:
+    """Test the CustomerFactory class."""
+    
+    def test_create_notif_customer_full(self, sample_customer_data):
+        """Test creating a NotifCustomer with full data."""
+        customer = CustomerFactory.create_notif_customer(sample_customer_data)
+        
+        assert isinstance(customer, NotifCustomer)
+        assert customer.person_name.given_name == "John"
+        assert customer.person_name.surname == "Doe"
+        assert customer.person_name.name_prefix == "Mr."
+        assert customer.person_name.name_title == "Jr."
+        
+        # Check telephone
+        assert len(customer.telephone) == 3
+        assert customer.telephone[0].phone_number == "+1234567890"
+        assert customer.telephone[0].phone_tech_type == "5"  # MOBILE
+        assert customer.telephone[1].phone_tech_type == "1"  # VOICE
+        assert customer.telephone[2].phone_tech_type is None
+        
+        # Check email
+        assert customer.email.value == "john.doe@example.com"
+        assert customer.email.remark == "newsletter:yes"
+        
+        # Check address
+        assert customer.address.address_line == "123 Main Street"
+        assert customer.address.city_name == "Anytown"
+        assert customer.address.postal_code == "12345"
+        assert customer.address.country_name.code == "US"
+        assert customer.address.remark == "catalog:no"
+        
+        # Check other attributes
+        assert customer.gender == "Male"
+        assert customer.birth_date == "1980-01-01"
+        assert customer.language == "en"
+    
+    def test_create_retrieve_customer_full(self, sample_customer_data):
+        """Test creating a RetrieveCustomer with full data."""
+        customer = CustomerFactory.create_retrieve_customer(sample_customer_data)
+        
+        assert isinstance(customer, RetrieveCustomer)
+        assert customer.person_name.given_name == "John"
+        assert customer.person_name.surname == "Doe"
+        # Same structure as NotifCustomer, so we don't need to test all fields again
+    
+    def test_create_customer_minimal(self, minimal_customer_data):
+        """Test creating customers with minimal data."""
+        notif_customer = CustomerFactory.create_notif_customer(minimal_customer_data)
+        retrieve_customer = CustomerFactory.create_retrieve_customer(minimal_customer_data)
+        
+        for customer in [notif_customer, retrieve_customer]:
+            assert customer.person_name.given_name == "Jane"
+            assert customer.person_name.surname == "Smith"
+            assert customer.person_name.name_prefix is None
+            assert customer.person_name.name_title is None
+            assert len(customer.telephone) == 0
+            assert customer.email is None
+            assert customer.address is None
+            assert customer.gender is None
+            assert customer.birth_date is None
+            assert customer.language is None
+    
+    def test_email_newsletter_options(self):
+        """Test different email newsletter options."""
+        # Newsletter yes
+        data_yes = CustomerData(given_name="Test", surname="User", 
+                               email_address="test@example.com", email_newsletter=True)
+        customer = CustomerFactory.create_notif_customer(data_yes)
+        assert customer.email.remark == "newsletter:yes"
+        
+        # Newsletter no
+        data_no = CustomerData(given_name="Test", surname="User", 
+                              email_address="test@example.com", email_newsletter=False)
+        customer = CustomerFactory.create_notif_customer(data_no)
+        assert customer.email.remark == "newsletter:no"
+        
+        # Newsletter not specified
+        data_none = CustomerData(given_name="Test", surname="User", 
+                                email_address="test@example.com", email_newsletter=None)
+        customer = CustomerFactory.create_notif_customer(data_none)
+        assert customer.email.remark is None
+    
+    def test_address_catalog_options(self):
+        """Test different address catalog options."""
+        # Catalog no
+        data_no = CustomerData(given_name="Test", surname="User", 
+                              address_line="123 Street", address_catalog=False)
+        customer = CustomerFactory.create_notif_customer(data_no)
+        assert customer.address.remark == "catalog:no"
+        
+        # Catalog yes
+        data_yes = CustomerData(given_name="Test", surname="User", 
+                               address_line="123 Street", address_catalog=True)
+        customer = CustomerFactory.create_notif_customer(data_yes)
+        assert customer.address.remark == "catalog:yes"
+        
+        # Catalog not specified
+        data_none = CustomerData(given_name="Test", surname="User", 
+                                address_line="123 Street", address_catalog=None)
+        customer = CustomerFactory.create_notif_customer(data_none)
+        assert customer.address.remark is None
+    
+    def test_from_notif_customer_roundtrip(self, sample_customer_data):
+        """Test converting NotifCustomer back to CustomerData."""
+        customer = CustomerFactory.create_notif_customer(sample_customer_data)
+        converted_data = CustomerFactory.from_notif_customer(customer)
+        
+        assert converted_data == sample_customer_data
+    
+    def test_from_retrieve_customer_roundtrip(self, sample_customer_data):
+        """Test converting RetrieveCustomer back to CustomerData."""
+        customer = CustomerFactory.create_retrieve_customer(sample_customer_data)
+        converted_data = CustomerFactory.from_retrieve_customer(customer)
+        
+        assert converted_data == sample_customer_data
+    
+    def test_phone_tech_type_conversion(self):
+        """Test that PhoneTechType enum values are properly converted."""
+        data = CustomerData(
+            given_name="Test", 
+            surname="User",
+            phone_numbers=[
+                ("+1111111111", PhoneTechType.VOICE),
+                ("+2222222222", PhoneTechType.FAX),
+                ("+3333333333", PhoneTechType.MOBILE)
+            ]
+        )
+        
+        customer = CustomerFactory.create_notif_customer(data)
+        assert customer.telephone[0].phone_tech_type == "1"  # VOICE
+        assert customer.telephone[1].phone_tech_type == "3"  # FAX
+        assert customer.telephone[2].phone_tech_type == "5"  # MOBILE
+
+
+class TestResGuestFactory:
+    """Test the ResGuestFactory class."""
+    
+    def test_create_notif_res_guests(self, sample_customer_data):
+        """Test creating NotifResGuests structure."""
+        res_guests = ResGuestFactory.create_notif_res_guests(sample_customer_data)
+        
+        assert isinstance(res_guests, NotifResGuests)
+        
+        # Navigate down the nested structure
+        customer = res_guests.res_guest.profiles.profile_info.profile.customer
+        assert customer.person_name.given_name == "John"
+        assert customer.person_name.surname == "Doe"
+        assert customer.email.value == "john.doe@example.com"
+    
+    def test_create_retrieve_res_guests(self, sample_customer_data):
+        """Test creating RetrieveResGuests structure."""
+        res_guests = ResGuestFactory.create_retrieve_res_guests(sample_customer_data)
+        
+        assert isinstance(res_guests, RetrieveResGuests)
+        
+        # Navigate down the nested structure
+        customer = res_guests.res_guest.profiles.profile_info.profile.customer
+        assert customer.person_name.given_name == "John"
+        assert customer.person_name.surname == "Doe"
+        assert customer.email.value == "john.doe@example.com"
+    
+    def test_create_res_guests_minimal(self, minimal_customer_data):
+        """Test creating ResGuests with minimal customer data."""
+        notif_res_guests = ResGuestFactory.create_notif_res_guests(minimal_customer_data)
+        retrieve_res_guests = ResGuestFactory.create_retrieve_res_guests(minimal_customer_data)
+        
+        for res_guests in [notif_res_guests, retrieve_res_guests]:
+            customer = res_guests.res_guest.profiles.profile_info.profile.customer
+            assert customer.person_name.given_name == "Jane"
+            assert customer.person_name.surname == "Smith"
+            assert customer.email is None
+            assert customer.address is None
+    
+    def test_extract_primary_customer_notif(self, sample_customer_data):
+        """Test extracting primary customer from NotifResGuests."""
+        res_guests = ResGuestFactory.create_notif_res_guests(sample_customer_data)
+        extracted_data = ResGuestFactory.extract_primary_customer(res_guests)
+        
+        assert extracted_data == sample_customer_data
+    
+    def test_extract_primary_customer_retrieve(self, sample_customer_data):
+        """Test extracting primary customer from RetrieveResGuests."""
+        res_guests = ResGuestFactory.create_retrieve_res_guests(sample_customer_data)
+        extracted_data = ResGuestFactory.extract_primary_customer(res_guests)
+        
+        assert extracted_data == sample_customer_data
+    
+    def test_roundtrip_conversion_notif(self, sample_customer_data):
+        """Test complete roundtrip: CustomerData -> NotifResGuests -> CustomerData."""
+        res_guests = ResGuestFactory.create_notif_res_guests(sample_customer_data)
+        extracted_data = ResGuestFactory.extract_primary_customer(res_guests)
+        
+        assert extracted_data == sample_customer_data
+    
+    def test_roundtrip_conversion_retrieve(self, sample_customer_data):
+        """Test complete roundtrip: CustomerData -> RetrieveResGuests -> CustomerData."""
+        res_guests = ResGuestFactory.create_retrieve_res_guests(sample_customer_data)
+        extracted_data = ResGuestFactory.extract_primary_customer(res_guests)
+        
+        assert extracted_data == sample_customer_data
+
+
+class TestPhoneTechType:
+    """Test the PhoneTechType enum."""
+    
+    def test_enum_values(self):
+        """Test that enum values are correct."""
+        assert PhoneTechType.VOICE.value == "1"
+        assert PhoneTechType.FAX.value == "3"
+        assert PhoneTechType.MOBILE.value == "5"
+
+
+class TestIntegration:
+    """Integration tests combining both factories."""
+    
+    def test_both_factories_produce_same_customer_data(self, sample_customer_data):
+        """Test that both factories can work with the same customer data."""
+        # Create using CustomerFactory
+        notif_customer = CustomerFactory.create_notif_customer(sample_customer_data)
+        retrieve_customer = CustomerFactory.create_retrieve_customer(sample_customer_data)
+        
+        # Create using ResGuestFactory and extract customers
+        notif_res_guests = ResGuestFactory.create_notif_res_guests(sample_customer_data)
+        retrieve_res_guests = ResGuestFactory.create_retrieve_res_guests(sample_customer_data)
+        
+        notif_from_res_guests = notif_res_guests.res_guest.profiles.profile_info.profile.customer
+        retrieve_from_res_guests = retrieve_res_guests.res_guest.profiles.profile_info.profile.customer
+        
+        # Compare customer names (structure should be identical)
+        assert notif_customer.person_name.given_name == notif_from_res_guests.person_name.given_name
+        assert notif_customer.person_name.surname == notif_from_res_guests.person_name.surname
+        assert retrieve_customer.person_name.given_name == retrieve_from_res_guests.person_name.given_name
+        assert retrieve_customer.person_name.surname == retrieve_from_res_guests.person_name.surname
+    
+    def test_complex_customer_workflow(self):
+        """Test a complex workflow with multiple operations."""
+        # Create original data
+        original_data = CustomerData(
+            given_name="Alice",
+            surname="Johnson",
+            phone_numbers=[
+                ("+1555123456", PhoneTechType.MOBILE),
+                ("+1555654321", PhoneTechType.VOICE)
+            ],
+            email_address="alice.johnson@company.com",
+            email_newsletter=False,
+            address_line="456 Business Ave",
+            city_name="Metropolis",
+            postal_code="67890",
+            country_code="CA",
+            address_catalog=True,
+            gender="Female",
+            language="fr"
+        )
+        
+        # Create ResGuests for both types
+        notif_res_guests = ResGuestFactory.create_notif_res_guests(original_data)
+        retrieve_res_guests = ResGuestFactory.create_retrieve_res_guests(original_data)
+        
+        # Extract data back from both
+        notif_extracted = ResGuestFactory.extract_primary_customer(notif_res_guests)
+        retrieve_extracted = ResGuestFactory.extract_primary_customer(retrieve_res_guests)
+        
+        # All should be equal
+        assert original_data == notif_extracted
+        assert original_data == retrieve_extracted
+        assert notif_extracted == retrieve_extracted
\ No newline at end of file
diff --git a/uv.lock b/uv.lock
index f494359..4c49b3e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -9,6 +9,7 @@ source = { virtual = "." }
 dependencies = [
     { name = "generateds" },
     { name = "lxml" },
+    { name = "pytest" },
     { name = "ruff" },
     { name = "xsdata", extra = ["cli", "lxml", "soap"] },
     { name = "xsdata-pydantic", extra = ["cli", "lxml", "soap"] },
@@ -18,6 +19,7 @@ dependencies = [
 requires-dist = [
     { name = "generateds", specifier = ">=2.44.3" },
     { name = "lxml", specifier = ">=6.0.1" },
+    { name = "pytest", specifier = ">=8.4.2" },
     { name = "ruff", specifier = ">=0.13.1" },
     { name = "xsdata", extras = ["cli", "lxml", "soap"], specifier = ">=25.7" },
     { name = "xsdata-pydantic", extras = ["cli", "lxml", "soap"], specifier = ">=24.5" },
@@ -140,6 +142,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/76/c6/c88e154df9c4e1a2a66ccf0005a88dfb2650c1dffb6f5ce603dfbd452ce3/idna-3.10-py3-none-any.whl", hash = "sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3", size = 70442 },
 ]
 
+[[package]]
+name = "iniconfig"
+version = "2.1.0"
+source = { registry = "https://pypi.org/simple" }
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