// 合约测试
test "Token transfer" {
    let token = Token::new(1000);
    let alice = address("0x1111...");
    let bob = address("0x2222...");
    
    assert_eq!(token.balance_of(alice), 1000);
    assert!(token.transfer(bob, 100));
    assert_eq!(token.balance_of(alice), 900);
    assert_eq!(token.balance_of(bob), 100);
}