[test] Add unit tests for Map utility class

tests/test_maps.py

@@ -0,0 +1,74 @@
+import pytest
+
+from WeatherRoutingTool.utils.maps import Map
+
+
+@pytest.fixture
+def basic_map():
+    return Map(50.0, 5.0, 55.0, 15.0)
+
+
+class TestMapInit:
+    def test_attributes_set(self, basic_map):
+        assert basic_map.lat1 == 50.0
+        assert basic_map.lon1 == 5.0
+        assert basic_map.lat2 == 55.0
+        assert basic_map.lon2 == 15.0
+
+    def test_values_stored_as_float(self):
+        m = Map(10, 20, 30, 40)
+        assert isinstance(m.lat1, float)
+        assert isinstance(m.lon1, float)
+        assert isinstance(m.lat2, float)
+        assert isinstance(m.lon2, float)
+
+    def test_negative_coords(self):
+        m = Map(-33.9, -70.6, -30.0, -65.0)
+        assert m.lat1 == -33.9
+        assert m.lon1 == -70.6
+
+
+class TestExtendVariable:
+    def test_min_subtracts(self, basic_map):
+        assert basic_map.extend_variable(10.0, "min", 2) == 8.0
+
+    def test_max_adds(self, basic_map):
+        assert basic_map.extend_variable(10.0, "max", 2) == 12.0
+
+    def test_invalid_type_raises(self, basic_map):
+        with pytest.raises(ValueError):
+            basic_map.extend_variable(10.0, "center", 2)
+
+    def test_zero_width(self, basic_map):
+        assert basic_map.extend_variable(5.0, "min", 0) == 5.0
+        assert basic_map.extend_variable(5.0, "max", 0) == 5.0
+
+
+class TestGetWideenedMap:
+    def test_returns_map_instance(self, basic_map):
+        assert isinstance(basic_map.get_widened_map(1), Map)
+
+    def test_widens_by_width(self, basic_map):
+        widened = basic_map.get_widened_map(2)
+        assert widened.lat1 == 48.0
+        assert widened.lon1 == 3.0
+        assert widened.lat2 == 57.0
+        assert widened.lon2 == 17.0
+
+    def test_zero_width_unchanged(self, basic_map):
+        widened = basic_map.get_widened_map(0)
+        assert widened.lat1 == basic_map.lat1
+        assert widened.lon1 == basic_map.lon1
+        assert widened.lat2 == basic_map.lat2
+        assert widened.lon2 == basic_map.lon2
+
+
+class TestGetVarTuple:
+    def test_returns_tuple(self, basic_map):
+        assert isinstance(basic_map.get_var_tuple(), tuple)
+
+    def test_correct_order(self, basic_map):
+        assert basic_map.get_var_tuple() == (50.0, 55.0, 5.0, 15.0)
+
+    def test_length(self, basic_map):
+        assert len(basic_map.get_var_tuple()) == 4