The project is missing unit test, please add the JaCoCo plugin as well to create the coverage report and put the coverage branch and line with minimum coverage of 100%.

Following the references to help you:

• https://www.baeldung.com/junit-5
• https://www.baeldung.com/mockito-annotations
• https://medium.com/javarevisited/restful-api-testing-in-java-with-mockito-controller-layer-f4605f8ffaf3
• https://www.baeldung.com/jacoco

The ideia is bring the flow, for that implement the following requirements:
It looks like you have a good set of entities for an E-commerce CRUD application. However, to create a comprehensive set of acceptance criteria, we need to define the attributes and relationships for each entity. Here's a basic set of acceptance criteria for each entity:

User - Delivery Acceptance Criteria

1. Track Shipment:

• As a user, I want to be able to track the shipment of my order.
• Acceptance Criteria:
  • I can find the tracking number associated with my order.
  • The system provides a link or a section where I can enter the tracking number to check the status.
  • The status should be updated in real-time.

2. Receive Shipment Notifications:

• As a user, I want to receive notifications about the status of my shipment.
• Acceptance Criteria:
  • I receive an email or SMS notification when the order is shipped.
  • Additional notifications are sent for key milestones (e.g., In Transit, Out for Delivery, Delivered).

3. View Estimated Delivery Date:

• As a user, I want to know the estimated delivery date for my order.
• Acceptance Criteria:
  • The estimated delivery date is displayed during the checkout process.
  • I can view the estimated delivery date in the order details section.

4. Provide Delivery Instructions:

• As a user, I want the option to provide specific delivery instructions.
• Acceptance Criteria:
  • During the checkout process, there is a section to add special delivery instructions.
  • The delivery personnel are informed about these instructions.

5. Update Delivery Address:

• As a user, I want the ability to update the delivery address before the order is shipped.
• Acceptance Criteria:
  • I can modify the delivery address in the order details until the order is marked as shipped.

6. View Past Deliveries:

• As a user, I want to access a history of my past deliveries.
• Acceptance Criteria:
  • There is a section in my account profile where I can view a list of past orders and their delivery statuses.

7. Request Return/Refund:

• As a user, I want a straightforward process to initiate a return or request a refund for undelivered or damaged items.
• Acceptance Criteria:
  • There is a clearly defined process or link in my account to initiate a return or request a refund.
  • The system guides me through the necessary steps.

Business Rules:

1. Users must have a unique email address.
2. Products must have a unique name.
3. Order total amount should be the sum of the products in the order.
4. Cart should be associated with a user and contain a list of products with quantities.
5. Checkout should create an order from the cart, and the cart should be cleared.
6. Payment should be associated with an order and include the payment amount and method.
7. Shipment should be associated with an order and include shipment details and status.

Entities

User

• Attributes:
  • UserID (Primary Key)
  • FirstName
  • LastName
  • Email
  • Password
  • Address
  • PhoneNumber

Product

• Attributes:
  • ProductID (Primary Key)
  • Name
  • Description
  • Price
  • StockQuantity

Order

• Attributes:
  • OrderID (Primary Key)
  • UserID (Foreign Key to User)
  • OrderDate
  • TotalAmount

Cart

• Attributes:
  • CartID (Primary Key)
  • UserID (Foreign Key to User)
  • Products (List of ProductIDs with quantities)

Checkout

• Attributes:
  • CheckoutID (Primary Key)
  • CartID (Foreign Key to Cart)
  • CheckoutDate
  • TotalAmount

Payment

• Attributes:
  • PaymentID (Primary Key)
  • OrderID (Foreign Key to Order)
  • PaymentDate
  • Amount
  • PaymentMethod

Shipment

• Attributes:
  • ShipmentID (Primary Key)
  • OrderID (Foreign Key to Order)
  • ShipmentDate
  • TrackingNumber
  • Status (e.g., Shipped, Delivered)