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()