public void ReturnCustomer_WhenCustomerIDIsFound()
{
CustomerBase customerBase = new CustomerBase();
customerBase.Add(new Customer("Joey", 1121));
customerBase.Add(new Customer("Jordan", 9999));
customerBase.Add(new Customer("Jacob", 2223));
Assert.IsNotNull(customerBase.Find(1121));
Assert.IsNotNull(customerBase.Find(9999));
Assert.IsNotNull(customerBase.Find(2223));
}
public void ReturnNull_WhenCustomerIDIsNotFound()
{
CustomerBase customerBase = new CustomerBase();
customerBase.Add(new Customer("Jackson", 1234));
customerBase.Add(new Customer("Roger", 5678));
Assert.IsNull(customerBase.Find(3333));
}