diff --git a/agenda/airbnb.py b/agenda/airbnb.py
new file mode 100644
index 0000000..65ff5ad
--- /dev/null
+++ b/agenda/airbnb.py
@@ -0,0 +1,189 @@
+"""Library for parsing Airbnb booking HTML files."""
+
+import json
+import re
+import typing
+from datetime import datetime
+from typing import Any
+from zoneinfo import ZoneInfo
+
+import lxml.html
+import pycountry
+
+StrDict = dict[str, typing.Any]
+
+
+def build_datetime(date_str: str, time_str: str, tz_name: str) -> datetime:
+    """
+    Combine an ISO date string, HH:MM time string, and a timezone name
+    into a timezone-aware datetime in the specified timezone.
+    """
+    dt_str = f"{date_str}T{time_str}"
+    naive_dt = datetime.fromisoformat(dt_str)
+    return naive_dt.replace(tzinfo=ZoneInfo(tz_name))
+
+
+def list_to_dict(items: list[typing.Any]) -> dict[str, typing.Any]:
+    """Convert a flat list to a dict, assuming alternating keys and values."""
+    return {items[i]: items[i + 1] for i in range(0, len(items), 2)}
+
+
+def extract_country_code(address: str) -> str | None:
+    """Return ISO 3166-1 alpha-2 country code from a free-text address."""
+    address_lower = address.lower()
+    for country in pycountry.countries:
+        if country.name.lower() in address_lower:
+            return str(country.alpha_2.lower())
+        if (
+            hasattr(country, "official_name")
+            and country.official_name.lower() in address_lower
+        ):
+            return str(country.alpha_2.lower())
+    return None
+
+
+def get_json_blob(tree: Any) -> str:
+    data_id = "data-injector-instances"
+    js_string = tree.xpath(f'//*[@id="{data_id}"]/text()')[0]
+    return str(js_string)
+
+
+def get_ui_state(tree: Any) -> StrDict:
+    data_id = "data-injector-instances"
+    js_string = tree.xpath(f'//*[@id="{data_id}"]/text()')[0]
+    big_blob = json.loads(str(js_string))
+    ui_state = walk_tree(big_blob, "uiState")
+    return list_to_dict(ui_state[0])
+
+
+def get_reservation_data(ui_state: StrDict) -> StrDict:
+    return {
+        row["id"]: row for row in ui_state["reservation"]["scheduled_event"]["rows"]
+    }
+
+
+def get_room_url(tree: Any) -> str | None:
+    for e in tree.xpath('//a[@data-testid="reservation-destination-link"]'):
+        href = e.get("href")
+        assert isinstance(href, str)
+        if not href.startswith("/room"):
+            continue
+        return "https://www.airbnb.co.uk" + href
+    return None
+
+
+def get_price_from_reservation(reservation: StrDict) -> str:
+    price_string = reservation["payment_summary"]["subtitle"]
+    assert isinstance(price_string, str)
+    tc = "Total cost: "
+    assert price_string.startswith(tc)
+    price = price_string[len(tc) :]
+    assert price[0] == "£"
+    return price[1:]
+
+
+def extract_booking_from_html(html_file: str) -> StrDict:
+    """Extract booking information from Airbnb HTML file."""
+
+    with open(html_file, "r", encoding="utf-8") as f:
+        text_content = f.read()
+
+    confirmation_match = re.search(
+        r"/trips/v1/reservation-details/ro/RESERVATION2_CHECKIN/([A-Z0-9]+)",
+        text_content,
+    )
+    if confirmation_match is None:
+        raise ValueError("Could not find confirmation code in HTML")
+    confirmation_code = confirmation_match.group(1)
+
+    tree = lxml.html.parse(html_file)
+    root = tree.getroot()
+    try:
+        ui_state = get_ui_state(tree)
+    except Exception:
+        print(html_file)
+        raise
+
+    reservation = get_reservation_data(ui_state)
+    m_guests = re.match(r"^(\d+) guests?$", reservation["guests"]["subtitle"])
+    if m_guests is None:
+        raise ValueError("Could not parse number of guests")
+    number_of_adults = int(m_guests.group(1))
+
+    price = get_price_from_reservation(reservation)
+    metadata = ui_state["reservation"]["metadata"]
+    country_code = metadata["country"].lower()
+
+    title = reservation["dynamic_marquee_title_image_v3"]["title"]
+    location = title.rpartition(" in ")[2]
+
+    checkin_checkout = reservation["checkin_checkout_arrival_guide"]
+    check_in_time = checkin_checkout["leading_subtitle"]
+    check_out_time = checkin_checkout["trailing_subtitle"]
+
+    check_in = build_datetime(
+        metadata["check_in_date"], check_in_time, metadata["timezone"]
+    )
+
+    check_out = build_datetime(
+        metadata["check_out_date"], check_out_time, metadata["timezone"]
+    )
+
+    address = reservation["map"]["address"]
+
+    if "header_action.pdp" in reservation:
+        name = reservation["header_action.pdp"]["subtitle"]
+    else:
+        name = root.findtext(".//h1")
+
+    booking = {
+        "type": "apartment",
+        "operator": "airbnb",
+        "name": name,
+        "location": location,
+        "booking_reference": confirmation_code,
+        "booking_url": f"https://www.airbnb.co.uk/trips/v1/reservation-details/ro/RESERVATION2_CHECKIN/{confirmation_code}",
+        "address": address,
+        "country": country_code,
+        "latitude": metadata["lat"],
+        "longitude": metadata["lng"],
+        "timezone": metadata["timezone"],
+        "from": check_in,
+        "to": check_out,
+        "price": price,
+        "currency": "GBP",
+        "number_of_adults": number_of_adults,
+    }
+
+    room_url = get_room_url(tree)
+    if room_url is not None:
+        booking["url"] = room_url
+
+    return booking
+
+
+def walk_tree(data: Any, want_key: str) -> Any:
+    """Recursively search for a dict containing 'reservation' and return its value."""
+    if isinstance(data, dict):
+        if want_key in data:
+            return data[want_key]
+        for key, value in data.items():
+            result = walk_tree(value, want_key)
+            if result is not None:
+                return result
+    elif isinstance(data, list):
+        for item in data:
+            result = walk_tree(item, want_key)
+            if result is not None:
+                return result
+    return None
+
+
+def parse_multiple_files(filenames: list[str]) -> list[StrDict]:
+    """Parse multiple Airbnb HTML files and return a list of booking dictionaries."""
+    bookings = []
+    for html_file in sorted(filenames):
+        booking = extract_booking_from_html(html_file)
+        assert booking
+        bookings.append(booking)
+    return bookings
diff --git a/parse_airbnb.py b/parse_airbnb.py
index 65b27fc..0f9843f 100755
--- a/parse_airbnb.py
+++ b/parse_airbnb.py
@@ -1,208 +1,17 @@
 #!/usr/bin/python3
 
-import json
-import re
 import sys
-import typing
-from datetime import datetime
-from typing import Any
-from zoneinfo import ZoneInfo
 
-import lxml.html
-import pycountry
 import yaml
 
-StrDict = dict[str, typing.Any]
-
-
-def build_datetime(date_str: str, time_str: str, tz_name: str) -> datetime:
-    """
-    Combine an ISO date string, HH:MM time string, and a timezone name
-    into a timezone-aware datetime in the specified timezone.
-    """
-    dt_str = f"{date_str}T{time_str}"
-    naive_dt = datetime.fromisoformat(dt_str)
-    return naive_dt.replace(tzinfo=ZoneInfo(tz_name))
-
-
-def list_to_dict(items: list) -> dict[str, int]:
-    """Convert a flat list to a dict, assuming alternating keys and values."""
-    return {items[i]: items[i + 1] for i in range(0, len(items), 2)}
-
-
-def extract_country_code(address: str) -> str | None:
-    """Return ISO 3166-1 alpha-2 country code from a free-text address."""
-    address_lower = address.lower()
-    for country in pycountry.countries:
-        if country.name.lower() in address_lower:
-            return str(country.alpha_2.lower())
-        if (
-            hasattr(country, "official_name")
-            and country.official_name.lower() in address_lower
-        ):
-            return str(country.alpha_2.lower())
-    return None
-
-
-def get_json_blob(tree) -> str:
-    data_id = "data-injector-instances"
-    js_string = tree.xpath(f'//*[@id="{data_id}"]/text()')[0]
-    return js_string
-
-
-def get_ui_state(tree) -> StrDict:
-    data_id = "data-injector-instances"
-    js_string = tree.xpath(f'//*[@id="{data_id}"]/text()')[0]
-    # print(js_string)
-    # sys.exit(0)
-    big_blob = json.loads(js_string)
-    ui_state = walk_tree(big_blob, "uiState")
-    # print(json.dumps(ui_state))
-
-    return list_to_dict(ui_state[0])
-
-
-def get_reservation_data(ui_state: StrDict) -> StrDict:
-    return {
-        row["id"]: row for row in ui_state["reservation"]["scheduled_event"]["rows"]
-    }
-
-
-def get_room_url(tree) -> str:
-    for e in tree.xpath('//a[@data-testid="reservation-destination-link"]'):
-        href = e.get("href")
-        assert isinstance(href, str)
-        if not href.startswith("/room"):
-            continue
-        return "https://www.airbnb.co.uk" + href
-
-
-def get_price_from_reservation(reservation: StrDict) -> str:
-    price_string = reservation["payment_summary"]["subtitle"]
-    assert isinstance(price_string, str)
-    tc = "Total cost: "
-    assert price_string.startswith(tc)
-    price = price_string[len(tc) :]
-    assert price[0] == "£"
-    return price[1:]
-
-
-def extract_booking_from_html(html_file: str) -> StrDict:
-    """Extract booking information from Airbnb HTML file."""
-
-    with open(html_file, "r", encoding="utf-8") as f:
-        text_content = f.read()
-
-    confirmation_code = re.search(
-        r"/trips/v1/reservation-details/ro/RESERVATION2_CHECKIN/([A-Z0-9]+)",
-        text_content,
-    ).group(1)
-
-    tree = lxml.html.parse(html_file)
-    root = tree.getroot()
-    try:
-        ui_state = get_ui_state(tree)
-    except Exception:
-        print(html_file)
-        raise
-    # print(json.dumps(ui_state))
-
-    reservation = get_reservation_data(ui_state)
-    m_guests = re.match(r"^(\d+) guests?$", reservation["guests"]["subtitle"])
-    number_of_adults = int(m_guests.group(1))
-
-    price = get_price_from_reservation(reservation)
-    # print(reservation["payment_summary"]["subtitle"])
-    # print(json.dumps(reservation))
-    metadata = ui_state["reservation"]["metadata"]
-    country_code = metadata["country"].lower()
-    # pprint(metadata)
-
-    # print(json.dumps(x))
-
-    title = reservation["dynamic_marquee_title_image_v3"]["title"]
-    location = title.rpartition(" in ")[2]
-
-    # print(json.dumps(reservation))
-    checkin_checkout = reservation["checkin_checkout_arrival_guide"]
-    # pprint(checkin_checkout)
-    check_in_time = checkin_checkout["leading_subtitle"]
-    check_out_time = checkin_checkout["trailing_subtitle"]
-
-    check_in = build_datetime(
-        metadata["check_in_date"], check_in_time, metadata["timezone"]
-    )
-
-    check_out = build_datetime(
-        metadata["check_out_date"], check_out_time, metadata["timezone"]
-    )
-
-    # print(check_in, check_out)
-
-    address = reservation["map"]["address"]
-
-    # country_code = extract_country_code(address)
-
-    # if "header_action.pdp" not in reservation:
-    #     pprint(reservation)
-
-    if "header_action.pdp" in reservation:
-        name = reservation["header_action.pdp"]["subtitle"]
-    else:
-        name = root.findtext(".//h1")
-
-    booking = {
-        "type": "apartment",
-        "operator": "airbnb",
-        "name": name,
-        "location": location,
-        "booking_reference": confirmation_code,
-        "booking_url": f"https://www.airbnb.co.uk/trips/v1/reservation-details/ro/RESERVATION2_CHECKIN/{confirmation_code}",
-        "address": address,
-        "country": country_code,
-        "latitude": metadata["lat"],
-        "longitude": metadata["lng"],
-        "timezone": metadata["timezone"],
-        "from": check_in,
-        "to": check_out,
-        "price": price,
-        "currency": "GBP",
-        "number_of_adults": number_of_adults,
-    }
-
-    booking["url"] = get_room_url(tree)
-
-    return booking
-
-
-def walk_tree(data: Any, want_key: str) -> Any:
-    """Recursively search for a dict containing 'reservation' and return its value."""
-    if isinstance(data, dict):
-        if want_key in data:
-            return data[want_key]
-        for key, value in data.items():
-            result = walk_tree(value, want_key)
-            if result is not None:
-                return result
-    elif isinstance(data, list):
-        for item in data:
-            result = walk_tree(item, want_key)
-            if result is not None:
-                return result
-    return None
+from agenda.airbnb import parse_multiple_files
 
 
 def main() -> None:
     """Main function."""
 
-    filenames = sorted(sys.argv[1:])
-
-    bookings = []
-    for html_file in filenames:
-        booking = extract_booking_from_html(html_file)
-        assert booking
-        bookings.append(booking)
-
+    filenames = sys.argv[1:]
+    bookings = parse_multiple_files(filenames)
     print(yaml.dump(bookings, sort_keys=False))
 
 
diff --git a/tests/test_airbnb.py b/tests/test_airbnb.py
new file mode 100644
index 0000000..7036cbf
--- /dev/null
+++ b/tests/test_airbnb.py
@@ -0,0 +1,186 @@
+"""Tests for agenda.airbnb module."""
+
+import pytest
+from datetime import datetime
+from zoneinfo import ZoneInfo
+from unittest.mock import Mock, patch, mock_open
+
+from agenda.airbnb import (
+    build_datetime,
+    list_to_dict,
+    extract_country_code,
+    walk_tree,
+    get_ui_state,
+    get_reservation_data,
+    get_price_from_reservation,
+    parse_multiple_files,
+)
+
+
+class TestBuildDatetime:
+    def test_build_datetime_utc(self):
+        result = build_datetime("2025-07-28", "15:30", "UTC")
+        expected = datetime(2025, 7, 28, 15, 30, tzinfo=ZoneInfo("UTC"))
+        assert result == expected
+
+    def test_build_datetime_local_timezone(self):
+        result = build_datetime("2025-12-25", "09:00", "Europe/London")
+        expected = datetime(2025, 12, 25, 9, 0, tzinfo=ZoneInfo("Europe/London"))
+        assert result == expected
+
+
+class TestListToDict:
+    def test_list_to_dict_even_items(self):
+        items = ["key1", "value1", "key2", "value2"]
+        result = list_to_dict(items)
+        expected = {"key1": "value1", "key2": "value2"}
+        assert result == expected
+
+    def test_list_to_dict_empty_list(self):
+        result = list_to_dict([])
+        assert result == {}
+
+    def test_list_to_dict_single_pair(self):
+        items = ["name", "John"]
+        result = list_to_dict(items)
+        assert result == {"name": "John"}
+
+
+class TestExtractCountryCode:
+    def test_extract_country_code_uk(self):
+        address = "123 Main Street, London, United Kingdom"
+        result = extract_country_code(address)
+        assert result == "gb"
+
+    def test_extract_country_code_france(self):
+        address = "456 Rue de la Paix, Paris, France"
+        result = extract_country_code(address)
+        assert result == "fr"
+
+    def test_extract_country_code_usa(self):
+        address = "789 Broadway, New York, United States"
+        result = extract_country_code(address)
+        assert result == "us"
+
+    def test_extract_country_code_not_found(self):
+        address = "123 Unknown Street, Mystery City"
+        result = extract_country_code(address)
+        assert result is None
+
+    def test_extract_country_code_case_insensitive(self):
+        address = "123 Main Street, UNITED KINGDOM"
+        result = extract_country_code(address)
+        assert result == "gb"
+
+
+class TestWalkTree:
+    def test_walk_tree_dict_found(self):
+        data = {"level1": {"level2": {"target": "found"}}}
+        result = walk_tree(data, "target")
+        assert result == "found"
+
+    def test_walk_tree_dict_not_found(self):
+        data = {"level1": {"level2": {"other": "value"}}}
+        result = walk_tree(data, "target")
+        assert result is None
+
+    def test_walk_tree_list_found(self):
+        data = [{"other": "value"}, {"target": "found"}]
+        result = walk_tree(data, "target")
+        assert result == "found"
+
+    def test_walk_tree_nested_list_dict(self):
+        data = [{"level1": [{"target": "found"}]}]
+        result = walk_tree(data, "target")
+        assert result == "found"
+
+    def test_walk_tree_empty_data(self):
+        result = walk_tree({}, "target")
+        assert result is None
+
+
+class TestGetPriceFromReservation:
+    def test_get_price_from_reservation_valid(self):
+        reservation = {
+            "payment_summary": {"subtitle": "Total cost: £150.00"}
+        }
+        result = get_price_from_reservation(reservation)
+        assert result == "150.00"
+
+    def test_get_price_from_reservation_different_amount(self):
+        reservation = {
+            "payment_summary": {"subtitle": "Total cost: £89.99"}
+        }
+        result = get_price_from_reservation(reservation)
+        assert result == "89.99"
+
+
+class TestParseMultipleFiles:
+    @patch('agenda.airbnb.extract_booking_from_html')
+    def test_parse_multiple_files_single_file(self, mock_extract):
+        mock_booking = {
+            "type": "apartment",
+            "operator": "airbnb",
+            "name": "Test Apartment",
+            "booking_reference": "ABC123"
+        }
+        mock_extract.return_value = mock_booking
+        
+        result = parse_multiple_files(["test1.html"])
+        
+        assert len(result) == 1
+        assert result[0] == mock_booking
+        mock_extract.assert_called_once_with("test1.html")
+
+    @patch('agenda.airbnb.extract_booking_from_html')
+    def test_parse_multiple_files_multiple_files(self, mock_extract):
+        mock_booking1 = {"booking_reference": "ABC123"}
+        mock_booking2 = {"booking_reference": "DEF456"}
+        mock_extract.side_effect = [mock_booking1, mock_booking2]
+        
+        result = parse_multiple_files(["test2.html", "test1.html"])
+        
+        assert len(result) == 2
+        assert result[0] == mock_booking1
+        assert result[1] == mock_booking2
+
+    @patch('agenda.airbnb.extract_booking_from_html')
+    def test_parse_multiple_files_empty_list(self, mock_extract):
+        result = parse_multiple_files([])
+        assert result == []
+        mock_extract.assert_not_called()
+
+
+class TestGetUiState:
+    @patch('lxml.html.etree')
+    def test_get_ui_state_with_mock_tree(self, mock_etree):
+        mock_tree = Mock()
+        mock_tree.xpath.return_value = ['{"test": [["uiState", {"key": "value"}]]}']
+        
+        with patch('agenda.airbnb.walk_tree') as mock_walk:
+            mock_walk.return_value = [["key", "value"]]
+            result = get_ui_state(mock_tree)
+            
+            assert result == {"key": "value"}
+            mock_tree.xpath.assert_called_once_with('//*[@id="data-injector-instances"]/text()')
+
+
+class TestGetReservationData:
+    def test_get_reservation_data(self):
+        ui_state = {
+            "reservation": {
+                "scheduled_event": {
+                    "rows": [
+                        {"id": "row1", "data": "value1"},
+                        {"id": "row2", "data": "value2"}
+                    ]
+                }
+            }
+        }
+        
+        result = get_reservation_data(ui_state)
+        expected = {
+            "row1": {"id": "row1", "data": "value1"},
+            "row2": {"id": "row2", "data": "value2"}
+        }
+        assert result == expected
\ No newline at end of file