feat: implement Textual TUI and SQLite database for sensor management

tests/test_discovery_manager.py

@@ -0,0 +1,57 @@
+import pytest
+import os
+from pathlib import Path
+from sensorpajen.discovery_manager import DiscoveryManager, DiscoveredSensor
+
+def test_discovery_manager_init(tmp_path):
+    db_file = tmp_path / "sensors.db"
+    manager = DiscoveryManager(str(db_file))
+    assert db_file.exists()
+
+def test_discovery_manager_add_new(tmp_path):
+    db_file = tmp_path / "sensors.db"
+    manager = DiscoveryManager(str(db_file))
+    
+    mac = "AA:BB:CC:DD:EE:FF"
+    manager.add_or_update(mac, "ATC_123456", -70, 22.5, 45, 100, 3.0)
+    
+    pending = manager.get_pending()
+    assert len(pending) == 1
+    sensor = pending[0]
+    assert sensor.mac == mac
+    assert sensor.name == "ATC_123456"
+    assert sensor.sample_reading["temperature"] == 22.5
+    assert sensor.status == "pending"
+    assert sensor.count == 1
+
+def test_discovery_manager_update_existing(tmp_path):
+    db_file = tmp_path / "sensors.db"
+    manager = DiscoveryManager(str(db_file))
+    
+    mac = "AA:BB:CC:DD:EE:FF"
+    manager.add_or_update(mac, "ATC_123456", -70, 22.5, 45, 100, 3.0)
+    
+    # Update with new values
+    manager.add_or_update(mac, "ATC_123456", -60, 23.0, 40, 99, 2.9)
+    
+    pending = manager.get_pending()
+    assert len(pending) == 1
+    sensor = pending[0]
+    assert sensor.rssi == -60
+    assert sensor.sample_reading["temperature"] == 23.0
+    assert sensor.sample_reading["humidity"] == 40.0
+    assert sensor.count == 2
+
+def test_discovery_manager_persistence(tmp_path):
+    db_file = tmp_path / "sensors.db"
+    manager = DiscoveryManager(str(db_file))
+    
+    mac = "AA:BB:CC:DD:EE:FF"
+    manager.add_or_update(mac, "ATC_123456", -70, 22.5, 45, 100, 3.0)
+    
+    # Create new manager and load from same DB
+    manager2 = DiscoveryManager(str(db_file))
+    pending = manager2.get_pending()
+    assert len(pending) == 1
+    assert pending[0].mac == mac
+    assert pending[0].name == "ATC_123456"