Add Raspberry Pi health monitoring

Co-authored-by: Copilot <[email protected]>

tests/test_app_health.py

@@ -0,0 +1,49 @@
+import unittest
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from modules import app_health
+
+
+class HealthParserTest(unittest.TestCase):
+    def test_parses_memory_usage(self):
+        memory = app_health.parse_meminfo(
+            "MemTotal:       1000 kB\nMemAvailable:    250 kB\n"
+        )
+
+        self.assertEqual(memory["total_bytes"], 1024000)
+        self.assertEqual(memory["used_bytes"], 768000)
+        self.assertEqual(memory["used_percent"], 75.0)
+
+    def test_rejects_incomplete_memory_data(self):
+        with self.assertRaises(ValueError):
+            app_health.parse_meminfo("MemTotal: 1000 kB\n")
+
+    def test_parses_current_and_historical_throttling(self):
+        throttling = app_health.parse_throttled("throttled=0x50005\n")
+
+        self.assertEqual(throttling["raw"], "0x50005")
+        self.assertEqual(
+            throttling["current"], ["under_voltage", "throttled"]
+        )
+        self.assertEqual(
+            throttling["occurred"], ["under_voltage", "throttled"]
+        )
+
+    def test_rejects_unexpected_throttling_response(self):
+        with self.assertRaises(ValueError):
+            app_health.parse_throttled("unknown")
+
+    @patch("modules.app_health.shutil.disk_usage")
+    def test_disk_percent_accounts_for_reserved_blocks(self, disk_usage):
+        disk_usage.return_value = SimpleNamespace(
+            total=100, used=88, free=9
+        )
+
+        disk = app_health._disk()
+
+        self.assertEqual(disk["used_percent"], 90.7)
+
+
+if __name__ == "__main__":
+    unittest.main()