public void TestSubBalance()
{
User user = new User(1, "name", 100F, false);
user.SubtractBalance(100F);
Assert.Equal(0F, user.Balance);
}
public void TestSubBalanceNegativeException()
{
User user = new User(1, "name", 100F, false);
Assert.Throws <ArgumentException>(() => user.SubtractBalance(-200F));
}
