public void CustomerLoanTest()
{
var customerManagerMock = new Mock <ICustomerManager>();
customerManagerMock.Setup(m =>
m.GetCustomerByNumber(It.IsAny <int>()))
.Returns(new Customer
{
CustomerNr = 8,
AmountOfBooksLoaned = 2
});
var customerAPI = new CustomerAPI(customerManagerMock.Object);
var successfull = customerAPI.BookStatusLoan(8, 2, true);
Assert.AreEqual(BookLoanStatus.OK, successfull);
customerManagerMock.Verify(m =>
m.AddCustomer(It.IsAny <int>()), Times.Once);
}
