feat: implement Textual TUI and SQLite database for sensor management

tests/test_mqtt_publisher.py

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+import pytest
+from unittest.mock import MagicMock, patch, call
+from sensorpajen.mqtt_publisher import MQTTPublisher
+import sensorpajen.config as config
+
+@pytest.fixture
+def mock_config():
+    with patch("sensorpajen.config.MQTT_HOST", "localhost"), \
+         patch("sensorpajen.config.MQTT_PORT", 1883), \
+         patch("sensorpajen.config.MQTT_USER", "user"), \
+         patch("sensorpajen.config.MQTT_PASSWORD", "pass"), \
+         patch("sensorpajen.config.MQTT_CLIENT_ID", "test_client"), \
+         patch("sensorpajen.config.MQTT_TOPIC_PREFIX", "test"):
+        yield
+
+@pytest.fixture
+def mock_config():
+    with patch("sensorpajen.config.MQTT_HOST", "localhost"), \
+         patch("sensorpajen.config.MQTT_PORT", 1883), \
+         patch("sensorpajen.config.MQTT_USER", "user"), \
+         patch("sensorpajen.config.MQTT_PASSWORD", "pass"), \
+         patch("sensorpajen.config.MQTT_CLIENT_ID", "test_client"), \
+         patch("sensorpajen.config.MQTT_TOPIC_PREFIX", "test"):
+        yield
+
+def test_mqtt_publisher_init(mock_config):
+    with patch("paho.mqtt.client.Client") as mock_client:
+        publisher = MQTTPublisher()
+        mock_client.assert_called_once()
+        publisher.client.username_pw_set.assert_called_with("user", "pass")
+
+def test_mqtt_publisher_connect(mock_config):
+    with patch("paho.mqtt.client.Client") as mock_client:
+        publisher = MQTTPublisher()
+        publisher.connect()
+        publisher.client.connect.assert_called_with("localhost", 1883, keepalive=60)
+        publisher.client.loop_start.assert_called_once()
+
+def test_mqtt_publisher_publish(mock_config):
+    with patch("paho.mqtt.client.Client") as mock_client:
+        publisher = MQTTPublisher()
+        publisher.connected = True
+        
+        with patch("sensorpajen.config.ENABLE_BATTERY", True):
+            publisher.publish_measurement("living_room", 22.5, 45, 3.0, 100)
+            
+            # Check if publish was called for each metric
+            calls = [
+                call("test/living_room/temp", "22.5"),
+                call("test/living_room/humidity", "45"),
+                call("test/living_room/batteryvoltage", "3.000"),
+                call("test/living_room/batterylevel", "100")
+            ]
+            publisher.client.publish.assert_has_calls(calls, any_order=True)
+
+def test_mqtt_publisher_publish_no_battery(mock_config):
+    with patch("paho.mqtt.client.Client") as mock_client:
+        publisher = MQTTPublisher()
+        publisher.connected = True
+        
+        with patch("sensorpajen.config.ENABLE_BATTERY", False):
+            publisher.publish_measurement("living_room", 22.5, 45, 3.0, 100)
+            
+            # Should only publish temp and humidity
+            assert publisher.client.publish.call_count == 2
+            publisher.client.publish.assert_any_call("test/living_room/temp", "22.5")
+            publisher.client.publish.assert_any_call("test/living_room/humidity", "45")
+
+def test_mqtt_publisher_not_connected(mock_config):
+    with patch("paho.mqtt.client.Client") as mock_client:
+        publisher = MQTTPublisher()
+        publisher.connected = False
+        
+        # Should not raise error, just log warning
+        publisher.publish_measurement("living_room", 22.5, 45)
+        publisher.client.publish.assert_not_called()