Add comprehensive test suite achieving 99% code coverage

Added 35 test files with 502 tests covering all Python modules including
API routes, ORM models, splendor game logic/TUI, heater controller,
weather service, NixOS installer, ZFS dataset management, and utilities.
Coverage improved from 11% to 99% (2540/2564 statements covered).

https://claude.ai/code/session_01SVzgLDUS1Cdc4eh1ijETTh

tests/test_heater_main_extended.py

@@ -0,0 +1,165 @@
+"""Extended tests for python/heater/main.py - FastAPI routes."""
+
+from __future__ import annotations
+
+import sys
+from unittest.mock import MagicMock, patch
+
+from python.heater.models import ActionResult, DeviceConfig, HeaterStatus
+
+
+def test_heater_app_routes() -> None:
+    """Test heater app has expected routes."""
+    mock_tinytuya = MagicMock()
+    with patch.dict(sys.modules, {"tinytuya": mock_tinytuya}):
+        if "python.heater.controller" in sys.modules:
+            del sys.modules["python.heater.controller"]
+        if "python.heater.main" in sys.modules:
+            del sys.modules["python.heater.main"]
+        from python.heater.main import create_app
+
+        config = DeviceConfig(device_id="abc", ip="10.0.0.1", local_key="key")
+        app = create_app(config)
+
+    route_paths = [r.path for r in app.routes]
+    assert "/status" in route_paths
+    assert "/on" in route_paths
+    assert "/off" in route_paths
+    assert "/toggle" in route_paths
+
+
+def test_heater_get_status_route() -> None:
+    """Test /status route handler."""
+    mock_tinytuya = MagicMock()
+    mock_device = MagicMock()
+    mock_device.status.return_value = {"dps": {"1": True, "101": 72}}
+    mock_tinytuya.Device.return_value = mock_device
+
+    with patch.dict(sys.modules, {"tinytuya": mock_tinytuya}):
+        if "python.heater.controller" in sys.modules:
+            del sys.modules["python.heater.controller"]
+        if "python.heater.main" in sys.modules:
+            del sys.modules["python.heater.main"]
+        from python.heater.main import create_app
+        from python.heater.controller import HeaterController
+
+        config = DeviceConfig(device_id="abc", ip="10.0.0.1", local_key="key")
+        app = create_app(config)
+
+        # Simulate lifespan by setting controller
+        app.state.controller = HeaterController(config)
+
+        # Find and call the status handler
+        for route in app.routes:
+            if hasattr(route, "path") and route.path == "/status":
+                result = route.endpoint()
+                assert result.power is True
+                break
+
+
+def test_heater_on_route() -> None:
+    """Test /on route handler."""
+    mock_tinytuya = MagicMock()
+    mock_device = MagicMock()
+    mock_device.set_value.return_value = None
+    mock_tinytuya.Device.return_value = mock_device
+
+    with patch.dict(sys.modules, {"tinytuya": mock_tinytuya}):
+        if "python.heater.controller" in sys.modules:
+            del sys.modules["python.heater.controller"]
+        if "python.heater.main" in sys.modules:
+            del sys.modules["python.heater.main"]
+        from python.heater.main import create_app
+        from python.heater.controller import HeaterController
+
+        config = DeviceConfig(device_id="abc", ip="10.0.0.1", local_key="key")
+        app = create_app(config)
+        app.state.controller = HeaterController(config)
+
+        for route in app.routes:
+            if hasattr(route, "path") and route.path == "/on":
+                result = route.endpoint()
+                assert result.success is True
+                break
+
+
+def test_heater_off_route() -> None:
+    """Test /off route handler."""
+    mock_tinytuya = MagicMock()
+    mock_device = MagicMock()
+    mock_device.set_value.return_value = None
+    mock_tinytuya.Device.return_value = mock_device
+
+    with patch.dict(sys.modules, {"tinytuya": mock_tinytuya}):
+        if "python.heater.controller" in sys.modules:
+            del sys.modules["python.heater.controller"]
+        if "python.heater.main" in sys.modules:
+            del sys.modules["python.heater.main"]
+        from python.heater.main import create_app
+        from python.heater.controller import HeaterController
+
+        config = DeviceConfig(device_id="abc", ip="10.0.0.1", local_key="key")
+        app = create_app(config)
+        app.state.controller = HeaterController(config)
+
+        for route in app.routes:
+            if hasattr(route, "path") and route.path == "/off":
+                result = route.endpoint()
+                assert result.success is True
+                break
+
+
+def test_heater_toggle_route() -> None:
+    """Test /toggle route handler."""
+    mock_tinytuya = MagicMock()
+    mock_device = MagicMock()
+    mock_device.status.return_value = {"dps": {"1": True}}
+    mock_device.set_value.return_value = None
+    mock_tinytuya.Device.return_value = mock_device
+
+    with patch.dict(sys.modules, {"tinytuya": mock_tinytuya}):
+        if "python.heater.controller" in sys.modules:
+            del sys.modules["python.heater.controller"]
+        if "python.heater.main" in sys.modules:
+            del sys.modules["python.heater.main"]
+        from python.heater.main import create_app
+        from python.heater.controller import HeaterController
+
+        config = DeviceConfig(device_id="abc", ip="10.0.0.1", local_key="key")
+        app = create_app(config)
+        app.state.controller = HeaterController(config)
+
+        for route in app.routes:
+            if hasattr(route, "path") and route.path == "/toggle":
+                result = route.endpoint()
+                assert result.success is True
+                break
+
+
+def test_heater_on_route_failure() -> None:
+    """Test /on route raises HTTPException on failure."""
+    mock_tinytuya = MagicMock()
+    mock_device = MagicMock()
+    mock_device.set_value.side_effect = ConnectionError("fail")
+    mock_tinytuya.Device.return_value = mock_device
+
+    with patch.dict(sys.modules, {"tinytuya": mock_tinytuya}):
+        if "python.heater.controller" in sys.modules:
+            del sys.modules["python.heater.controller"]
+        if "python.heater.main" in sys.modules:
+            del sys.modules["python.heater.main"]
+        from python.heater.main import create_app
+        from python.heater.controller import HeaterController
+        from fastapi import HTTPException
+
+        config = DeviceConfig(device_id="abc", ip="10.0.0.1", local_key="key")
+        app = create_app(config)
+        app.state.controller = HeaterController(config)
+
+        import pytest
+
+        for route in app.routes:
+            if hasattr(route, "path") and route.path == "/on":
+                with pytest.raises(HTTPException):
+                    route.endpoint()
+                break