public void AuthorizeReturnsUniqueId()
{
//Arrange
_authRequest = new AuthorizeRequest()
{
CardNumber = "5105105105105100", Currency = "GBP", Amount = 20
};
var authId = "123-456";
_mockLuhnCheckService.Setup(m => m.IsValidCardNumber(It.IsAny <string>())).Returns(true);
_mockRepo.Setup(a => a.Authorize(It.IsAny <AuthorizeRequest>())).Returns(authId);
//Act
var authResponse = _authService.AuthorizeTransaction(_authRequest);
//Assert
Assert.AreEqual(authId, authResponse.AuthorizationId);
}