diff --git a/.gitignore b/.gitignore
index de285a7..dcac9f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ env/
 venv/
 .venv/
 ENV/
+uv.lock
 
 # Logs
 *.log
diff --git a/pyproject.toml b/pyproject.toml
index fcd42e1..9ea365b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ Issues = "https://github.com/smittix/intercept/issues"
 dev = [
     "pytest>=7.0.0",
     "pytest-cov>=4.0.0",
+    "pytest-mock>=3.15.1",
     "ruff>=0.1.0",
     "black>=23.0.0",
     "mypy>=1.0.0",
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 07180d4..8051f92 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,6 +4,7 @@
 # Testing
 pytest>=7.0.0
 pytest-cov>=4.0.0
+pytest-mock>=3.15.1
 
 # Code quality
 ruff>=0.1.0
diff --git a/tests/test_bluetooth.py b/tests/test_bluetooth.py
new file mode 100644
index 0000000..be91d8c
--- /dev/null
+++ b/tests/test_bluetooth.py
@@ -0,0 +1,129 @@
+import pytest
+import json
+import subprocess
+from unittest.mock import MagicMock, patch
+from flask import Flask
+from routes.bluetooth import bluetooth_bp, classify_bt_device, detect_tracker
+
+
+@pytest.fixture(autouse=True)
+def mock_app_module(mocker):
+    mock_app = mocker.patch("routes.bluetooth.app_module")
+    mock_app.bt_devices = {}
+    mock_app.bt_beacons = {}
+    mock_app.bt_services = {}
+    mock_app.bt_queue = MagicMock()
+    mock_app.bt_lock = MagicMock()
+    mock_app.bt_process = None
+    mock_app.bt_interface = "hci0"
+    return mock_app
+
+
+@pytest.fixture
+def app():
+    app = Flask(__name__)
+    app.register_blueprint(bluetooth_bp)
+    return app
+
+
+@pytest.fixture
+def client(app):
+    return app.test_client()
+
+
+def test_classify_bt_device_by_name():
+    """Test classification based on common naming patterns."""
+    assert classify_bt_device("Sony WH-1000XM4", None, None) == "audio"
+    assert classify_bt_device("iPhone 15", None, None) == "phone"
+    assert classify_bt_device("Garmin Fenix", None, None) == "wearable"
+    assert classify_bt_device("Microsoft Mouse", None, None) == "input"
+    assert classify_bt_device("AirTag", None, None) == "tracker"
+    assert classify_bt_device("Generic Device", None, None) == "other"
+
+
+def test_classify_bt_device_by_class():
+    """Test classification based on Bluetooth Class of Device (CoD)."""
+    assert classify_bt_device(None, 0x0100, None) == "computer"
+    assert classify_bt_device(None, 0x0200, None) == "phone"
+    assert classify_bt_device(None, 0x0400, None) == "audio"
+
+
+def test_detect_tracker_by_mac():
+    """Test tracker detection using MAC OUI prefixes."""
+    # Assuming 'FF:FF:FF' is a mock prefix in patterns for testing
+    with patch("routes.bluetooth.TILE_PREFIXES", ["FF:FF"]):
+        result = detect_tracker("FF:FF:00:11:22:33", "Unknown")
+        assert result["type"] == "tile"
+
+
+def test_detect_tracker_by_name():
+    """Test tracker detection using name strings."""
+    result = detect_tracker("00:11:22:33:44:55", "My AirTag")
+    assert result["type"] == "airtag"
+    assert result["risk"] == "high"
+
+
+# --- Route Tests ---
+
+
+def test_get_interfaces_route(client, mocker):
+    """Test the /interfaces endpoint with mocked system output."""
+    mock_run = mocker.patch("subprocess.run")
+    # Mocking hciconfig output for a Linux system
+    mock_run.return_value = MagicMock(
+        stdout="hci0:\tType: Primary  Bus: USB\n\tBD Address: 00:11:22:33:44:55  ACL MTU: 1021:8  SCO MTU: 64:1\n\tUP RUNNING\n"
+    )
+    mocker.patch("platform.system", return_value="Linux")
+    mocker.patch("routes.bluetooth.check_tool", return_value=True)
+
+    response = client.get("/bt/interfaces")
+    data = response.get_json()
+
+    assert response.status_code == 200
+    assert data["interfaces"][0]["name"] == "hci0"
+    assert data["interfaces"][0]["status"] == "up"
+    assert data["tools"]["hcitool"] is True
+
+
+def test_stop_scan_route(client, mock_app_module):
+    """Test stopping a running scan process."""
+    mock_process = MagicMock()
+    mock_app_module.bt_process = mock_process
+
+    response = client.post("/bt/scan/stop")
+
+    assert response.status_code == 200
+    assert response.get_json()["status"] == "stopped"
+    mock_process.terminate.assert_called_once()
+
+
+def test_enum_services_error_no_mac(client):
+    """Test service enumeration validation."""
+    response = client.post("/bt/enum", json={})
+    assert response.status_code == 200
+    assert response.get_json()["status"] == "error"
+
+
+def test_get_devices_route(client, mock_app_module):
+    """Test retrieving the current device list from memory."""
+    mock_app_module.bt_devices = {"00:11:22:33:44:55": {"mac": "00:11:22:33:44:55", "name": "Test Device"}}
+
+    response = client.get("/bt/devices")
+    data = response.get_json()
+
+    assert response.status_code == 200
+    assert len(data["devices"]) == 1
+    assert data["devices"][0]["name"] == "Test Device"
+
+
+def test_reload_oui_route(client, mocker):
+    """Test the OUI database reload functionality."""
+    mocker.patch("routes.bluetooth.load_oui_database", return_value={"001122": "Test Corp"})
+
+    response = client.post("/bt/reload-oui")
+    data = response.get_json()
+
+    assert response.status_code == 200
+    assert data["status"] == "success"
+    assert data["entries"] > 0
+