import unittest
from core.user import User

class TestUser(unittest.TestCase):
    def test_default_values(self):
        user = User("alice", "Alice")
        self.assertEqual(user.id, "alice")
        self.assertEqual(user.name, "Alice")
        self.assertEqual(user.pin, "4242")
        self.assertEqual(user.debt, 0.0)

    def test_custom_pin(self):
        user = User("bob", "Bob", "1234")
        self.assertEqual(user.pin, "1234")

    def test_to_json(self):
        user = User("charlie", "Charlie", "9999")
        user.debt = 12.50
        expected = {
            "id": "charlie",
            "name": "Charlie",
            "debt": 12.50,
            "pin": "9999"
        }
        self.assertEqual(user.to_json(), expected)

    def test_from_json(self):
        data = {
            "id": "charlie",
            "name": "Charlie",
            "debt": 12.50,
            "pin": "9999"
        }
        user = User.from_json(data)
        self.assertEqual(user.id, "charlie")
        self.assertEqual(user.name, "Charlie")
        self.assertEqual(user.debt, 12.50)
        self.assertEqual(user.pin, "9999")

    def test_from_json_missing_pin(self):
        data = {
            "id": "charlie",
            "name": "Charlie",
            "debt": 12.50
        }
        user = User.from_json(data)
        self.assertEqual(user.pin, "4242")

if __name__ == "__main__":
    unittest.main()