public void AddCreditsTest()
{
RentItClient target = new RentItClient();
AccountCredentials credentials = new AccountCredentials {
UserName = "******",
HashedPassword = "******"
};
int oldCredits = target.GetAllCustomerData(credentials).Credits;
uint addAmount = 100;
bool expected = true;
bool actual = target.AddCredits(credentials, addAmount);
Assert.AreEqual(expected, actual);
int newCredits = target.GetAllCustomerData(credentials).Credits;
Assert.AreEqual(oldCredits + addAmount, newCredits);
}