first version of weather loader

apps/weather/src/tests.py

@@ -0,0 +1,37 @@
+import unittest
+
+from utils import format_coord, parse_coord
+
+
+class TestCoordinateFormatting(unittest.TestCase):
+
+    def test_round_trip(self):
+        cases = [
+            (52.25, 4.0, "N5225E0400"),
+            (-13.5, -122.0, "S1350W12200"),
+            (0.0, 0.0, "N0000E0000"),
+            (51.75, 6.5, "N5175E0650"),
+            (-0.25, 0.25, "S0025E0025"),
+        ]
+        for lat, lon, expected in cases:
+            with self.subTest(lat=lat, lon=lon):
+                self.assertEqual(format_coord(lat, lon), expected)
+                parsed_lat, parsed_lon = parse_coord(expected)
+                print(f"Parsed: {parsed_lat}, {parsed_lon} from {expected}")
+                self.assertAlmostEqual(parsed_lat, lat, places=6)
+                self.assertAlmostEqual(parsed_lon, lon, places=6)
+
+    def test_invalid_length(self):
+        with self.assertRaises(ValueError):
+            parse_coord("N52E4")  # too short, malformed
+
+    def test_negative_coordinates(self):
+        coord = format_coord(-52.25, -4.0)
+        self.assertEqual(coord, "S5225W0400")
+        lat, lon = parse_coord(coord)
+        self.assertAlmostEqual(lat, -52.25, places=6)
+        self.assertAlmostEqual(lon, -4.0, places=6)
+
+
+if __name__ == "__main__":
+    unittest.main()