Tests and helpers

tests/test_item.py

@@ -0,0 +1,37 @@
+import unittest
+from core.item import Item
+
+class TestItem(unittest.TestCase):
+    def test_item_initialization(self):
+        item = Item("coffee", "Coffee", 2.50)
+        self.assertEqual(item.id, "coffee")
+        self.assertEqual(item.name, "Coffee")
+        self.assertEqual(item.price, 2.50)
+
+    def test_item_price_conversion(self):
+        item = Item("tea", "Tea", "1.80")
+        self.assertEqual(item.price, 1.80)
+        self.assertIsInstance(item.price, float)
+
+    def test_to_json(self):
+        item = Item("sandwich", "Sandwich", 5.00)
+        expected = {
+            "id": "sandwich",
+            "name": "Sandwich",
+            "price": 5.00
+        }
+        self.assertEqual(item.to_json(), expected)
+
+    def test_from_json(self):
+        data = {
+            "id": "sandwich",
+            "name": "Sandwich",
+            "price": 5.00
+        }
+        item = Item.from_json(data)
+        self.assertEqual(item.id, "sandwich")
+        self.assertEqual(item.name, "Sandwich")
+        self.assertEqual(item.price, 5.00)
+
+if __name__ == "__main__":
+    unittest.main()