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Kevin Huang - added the domain-model.md file #47

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krythuang - added the domain-model.md file
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# Example Domain Model

## User Story

```
As a supermarket shopper,
So that I can pay for products at checkout,
I'd like to be able to know the total cost of items in my basket.
```

```
As an organised individual,
So that I can evaluate my shopping habits,
I'd like to see an itemised receipt that includes the name and price of the products
I bought as well as the quantity, and a total cost of my basket.
```

## Domain Model

| Class | Attributes | Methods | Scenario | Results |
|------------------|--------------------------------|----------------------------------|------------------------------------------------|-----------------------------------------------------------|
| Shopper | - basket: List\<Product> | - addToBasket(product: Product) | A shopper adds products to their basket. | Product is added to the basket. |
| | | - getBasketTotalCost(): double | A shopper wants to know the total cost. | The total cost of the basket is calculated and returned. |
| | | - generateReceipt(): Receipt | A shopper wants to see an itemized receipt. | An itemized receipt is generated and returned. |
| Product | - name: String | - getPrice(): double | A shopper needs to know the price of a product.| The price of the product is retrieved. |
| | - price: double | | | |
| Receipt | - items: List\<ReceiptItem> | - addItem(item: ReceiptItem) | Items are added to the receipt. | Item is added to the receipt. |
| | | - calculateTotalCost(): double | A shopper wants to calculate the total cost. | The total cost of the receipt is calculated and returned. |
| ReceiptItem | - product: Product | | | |
| | - quantity: int | | | |
| | | | | |