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Unit testing an e-commerce application: Java version
Hackathon, Foundations of software Testing, Spring 2024
The Order Processor is a system responsible for handling the processing of orders in an e-commerce
application. Its main role is to ensure that an order can be successfully completed by verifying
payment details and updating the inventory. Its primary function is to process orders received from
customers. This involves validating payment details (like credit card number and amount) and
ensuring that the payment can be successfully completed. After a successful payment, the Order
Processor then attempts to update the inventory. This step ensures that the ordered items are available
in the required quantities and that the stock levels are adjusted accordingly. If the payment processing
fails, the order processing is halted, and a failure response is returned. If the inventory update fails
after a successful payment, the system initiates a refund process to reverse the payment. This ensures
that customers are not charged for orders that cannot be fulfilled due to stock issues.
Order Processor integrates closely with the Payment and Inventory Services, two crucial components
of an e-commerce applications for maintaining transaction integrity and ensuring a smooth ordering
process for customers. A typical successful order involves receiving an order, successfully processing
the payment, updating the inventory, and confirming the order. However, payments that cannot be
processed result in a failed order without proceeding to inventory updates. Lastly, when the payment
is successful, but the inventory cannot be updated (e.g., insufficient stock), the system triggers a
refund and mark the order as failed.
You are a team of developers working on the implementation and testing of a class called
OrderProcessor. This class is responsible for processing orders in an e-commerce application.
public class OrderProcessor {
private PaymentService paySrv;
private InventoryService invSrv;

public OrderProcessor(PaymentService paySrv, InventoryService invSrv) {
this.paySrv = paySrv;
this.invSrv = invSrv;
boolean processOrder(PaymentDetails payDtls, List items){
// Code to process the order
}
}
An order consists of information about the payment (paymentDetails), such as credit card number
and amount to be paid, and a list of items objects, each representing a product to be purchased,
including the product ID and quantity. They are passed as parameters to processOrder for being
processed, and are defined by the following objects:
public class PaymentDetails {
private String creditCardNumber;
private int amount;
// Code for getters and constructors
}
public class Item {
private String productId;
private int quantity;
// Code for getters and constructors
}
The method processOrder returns true if the order is successfully processed, and it returns false
if the order processing fails. The method does not throw any exceptions and handles all failures
internally by returning false.
The OrderProcessor class interacts with two other classes: PaymentService and
InventoryService of which we only have the interfaces:
public interface PaymentService {
boolean processPayment(PaymentDetails payDtls);
void refundPayment(PaymentDetails payDtls);
}

import java.util.List;
public interface InventoryService {
boolean updateInventory(List items);
}
The expected behaviour of the method processOrder is as follows:
• It first attempts to process the payment using the PaymentService.
• If the payment is successfully processed, the method then attempts to update the inventory
using the InventoryService.
• If the inventory update is successful, the method returns true, indicating the order was
processed successfully.
• If the payment processing fails, the method returns false.
• If the inventory update fails after the payment has been processed, the method:
o Calls PaymentService.refundPayment to refund the payment.
o Returns false.
Your task is to:
1. Complete the implementation of the classes OrderProcessor, PaymentDetails, and Item.
2. Design test cases using the interface-based approach and one of the related coverages criteria
3. Design test cases verifying the interactions of OrderProcessor with PaymentService and
InventoryService.
4. Design to two more extra test cases using metamorphic testing to validate that certain
properties hold true when inputs are transformed.
5. Implement the necessary scaffolding to run all your test cases for an OrderProcessor class.
Unit testing an e-commerce application: C++ version
Hackathon, Foundations of software Testing, Spring 2024
The Order Processor is a system responsible for handling the processing of orders in an e-commerce
application. Its main role is to ensure that an order can be successfully completed by verifying
payment details and updating the inventory. Its primary function is to process orders received from
customers. This involves validating payment details (like credit card number and amount) and
ensuring that the payment can be successfully completed. After a successful payment, the Order
Processor then attempts to update the inventory. This step ensures that the ordered items are available
in the required quantities and that the stock levels are adjusted accordingly. If the payment processing
fails, the order processing is halted, and a failure response is returned. If the inventory update fails
after a successful payment, the system initiates a refund process to reverse the payment. This ensures
that customers are not charged for orders that cannot be fulfilled due to stock issues.
Order Processor integrates closely with the Payment and Inventory Services, two crucial components
of an e-commerce applications for maintaining transaction integrity and ensuring a smooth ordering
process for customers. A typical successful order involves receiving an order, successfully processing
the payment, updating the inventory, and confirming the order. However, payments that cannot be
processed result in a failed order without proceeding to inventory updates. Lastly, when the payment
is successful, but the inventory cannot be updated (e.g., insufficient stock), the system triggers a
refund and mark the order as failed.
You are a team of developers working on the implementation and testing of a class called
OrderProcessor. This class is responsible for processing orders in an e-commerce application.
#include "PaymentService.h"
#include "InventoryService.h"
#include "PaymentDetails.h"
#include "Item.h"
#include

class OrderProcessor {
private:
PaymentService* paySrv;
InventoryService* invSrv;

public:
OrderProcessor::OrderProcessor(PaymentService* paySrv, InventoryService*
invSrv){
this->paySrv = paySrv;
this->invSrv = invSrv;
}

bool processOrder(const PaymentDetails& payDtls, const std::vector&
items) {

// Code to process the order
}
};
An order consists of information about the payment (paymentDetails), such as credit card number
and amount to be paid, and a list of items objects, each representing a product to be purchased,
including the product ID and quantity. They are passed as parameters to processOrder for being
processed, and are defined by the following objects (the implementation for constructors and getters
needs to be inserted). #include

class PaymentDetails {
private:
std::string creditCardNumber;
int amount;

public:
// code for Getters and Constructor

};

#include

class Item {
private:
std::string productId;
int quantity;

public:
// Code for Getters and Constructor

};

The method processOrder returns true if the order is successfully processed, and it returns false
if the order processing fails. The method does not throw any exceptions and handles all failures
internally by returning false.
The OrderProcessor class interacts with two other classes: PaymentService and
InventoryService of which we only have the interfaces. The interfaces are defined using pure virtual
functions, with = 0 indicating that the functions are pure virtual and must be overridden by derived
classes. The PaymentDetails and Item classes are assumed to be defined elsewhere.
#include "PaymentDetails.h"
class PaymentService {
public:
virtual ~PaymentService() = default;
virtual bool processPayment(const PaymentDetails& payDtls) = 0;
virtual void refundPayment(const PaymentDetails& payDtls) = 0;
};

#include
#include "Item.h"

class InventoryService {
public:
virtual ~InventoryService() = default;
virtual bool updateInventory(const std::vector& items) = 0;

};

The expected behaviour of the method processOrder is as follows:
• It first attempts to process the payment using the PaymentService.
• If the payment is successfully processed, the method then attempts to update the inventory
using the InventoryService. • If the inventory update is successful, the method returns true, indicating the order was
processed successfully.
• If the payment processing fails, the method returns false.
• If the inventory update fails after the payment has been processed, the method:
o Calls PaymentService.refundPayment to refund the payment.
o Returns false.
Your task is to:
1. Complete the implementation of the classes OrderProcessor, PaymentDetails, and Item.
2. Design test cases using the interface-based approach and one of the related coverages criteria
3. Design test cases verifying the interactions of OrderProcessor with PaymentService and
InventoryService.
4. Design to two more extra test cases using metamorphic testing to validate that certain
properties hold true when inputs are transformed.
5. Implement the necessary scaffolding to run all your test cases for an OrderProcessor class.

Unit testing an e-commerce application: Python version
Hackathon, Foundations of software Testing, Spring 2024
The Order Processor is a system responsible for handling the processing of orders in an e-commerce
application. Its main role is to ensure that an order can be successfully completed by verifying
payment details and updating the inventory. Its primary function is to process orders received from
customers. This involves validating payment details (like credit card number and amount) and
ensuring that the payment can be successfully completed. After a successful payment, the Order
Processor then attempts to update the inventory. This step ensures that the ordered items are available
in the required quantities and that the stock levels are adjusted accordingly. If the payment processing
fails, the order processing is halted, and a failure response is returned. If the inventory update fails
after a successful payment, the system initiates a refund process to reverse the payment. This ensures
that customers are not charged for orders that cannot be fulfilled due to stock issues.
Order Processor integrates closely with the Payment and Inventory Services, two crucial components
of an e-commerce applications for maintaining transaction integrity and ensuring a smooth ordering
process for customers. A typical successful order involves receiving an order, successfully processing
the payment, updating the inventory, and confirming the order. However, payments that cannot be
processed result in a failed order without proceeding to inventory updates. Lastly, when the payment
is successful, but the inventory cannot be updated (e.g., insufficient stock), the system triggers a
refund and mark the order as failed.
You are a team of developers working on the implementation and testing of a class called
OrderProcessor. This class is responsible for processing orders in an e-commerce application. Since
Python is not a statically typed language we use typing.List to indicate that the items parameter is
expected to be a list of Item objects. Also, the pass statement is to leave the implementation to you.

from typing import List

class OrderProcessor:
def __init__(self, paySrv, invSrv):
"""
Constructor for OrderProcessor class.

Args:
paySrv: PaymentService object.
invSrv: InventoryService object.
"""
self.paySrv = paySrv
self.invSrv = invSrv

def processOrder(self, payDtls, items):
"""
Method to process the order.

Args:
payDtls: PaymentDetails object.
items: List of Item objects.

Returns:
bool: True if order processing is successful, False otherwise.
"""
pass
An order consists of information about the payment (paymentDetails), such as credit card number
and amount to be paid, and a list of items objects, each representing a product to be purchased,
including the product ID and quantity. They are passed as parameters to processOrder for being
processed, and are defined by the following objects, where the class definitions include the __init__
method for constructors and @property decorators for getters:

class PaymentDetails:
def __init__(self, credit_card_number, amount):
pass

@property
def credit_card_number(self):
pass

@property
def amount(self):
pass

class Item:
def __init__(self, product_id, quantity):
pass

@property
def product_id(self):
pass

@property
def quantity(self):
pass

The method processOrder returns true if the order is successfully processed, and it returns false
if the order processing fails. The method does not throw any exceptions and handles all failures
internally by returning false.
The OrderProcessor class interacts with two other classes: PaymentService and
InventoryService of which we only have the interfaces. The abc module is used below to define
abstract base classes. The abstractmethod decorator ensures that derived classes must implement
the abstract methods. The PaymentDetails and Item classes are assumed to be defined elsewhere.

from abc import ABC, abstractmethod

class PaymentService(ABC):

@abstractmethod
def process_payment(self, pay_dtls):
pass

@abstractmethod
def refund_payment(self, pay_dtls):
pass

from abc import ABC, abstractmethod

class InventoryService(ABC):

@abstractmethod
def update_inventory(self, items):
pass
The expected behaviour of the method processOrder is as follows:
• It first attempts to process the payment using the PaymentService.
• If the payment is successfully processed, the method then attempts to update the inventory
using the InventoryService.
• If the inventory update is successful, the method returns true, indicating the order was
processed successfully.
• If the payment processing fails, the method returns false.
• If the inventory update fails after the payment has been processed, the method:
o Calls PaymentService.refundPayment to refund the payment.
o Returns false.
Your task is to:
6. Complete the implementation of the classes OrderProcessor, PaymentDetails, and Item.
7. Design test cases using the interface-based approach and one of the related coverages criteria
8. Design test cases verifying the interactions of OrderProcessor with PaymentService and
InventoryService.
9. Design to two more extra test cases using metamorphic testing to validate that certain
properties hold true when inputs are transformed.
10. Implement the necessary scaffolding to run all your test cases for an OrderProcessor class.