Grocery Test Suite #1

package ca.ubc.cpsc210.grocery;

import ca.ubc.cpsc210.grocery.model.GroceryBill;
import ca.ubc.cpsc210.grocery.model.GroceryItem;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class GroceryBillTest {
    private GroceryBill testBill;
    private GroceryItem milk;
    private GroceryItem cereal;
    private GroceryItem tea;

    @BeforeEach
    void runBefore() {
        testBill = new GroceryBill();
        initGroceryItems();
    }

    @Test
    void testConstructor() {
        assertEquals(0, testBill.getNumLineItems());
        assertEquals(0, testBill.getTotalNumberOfItemsPurchased());
    }

    @Test
    void testAddOneItem() {
        testBill.addPurchase(milk, 1);
        assertEquals(1, testBill.getNumLineItems());
        assertEquals(1, testBill.getTotalNumberOfItemsPurchased());
    }

    @Test
    void testAddMultipleItems() {
        testBill.addPurchase(milk, 1);
        testBill.addPurchase(tea, 1);
        assertEquals(2, testBill.getNumLineItems());
        assertEquals(2, testBill.getTotalNumberOfItemsPurchased());
    }

    @Test
    void testAddMoreThanOneOfSingleItem() {
        testBill.addPurchase(milk, 2);
        assertEquals(1, testBill.getNumLineItems());
        assertEquals(2, testBill.getTotalNumberOfItemsPurchased());
    }

    @Test
    void testGetQuantityAddedItemNotPurchased() {
        testBill.addPurchase(milk, 2);
        assertEquals(0, testBill.getTotalQuantityOfItemPurchased(tea));
    }

    @Test
    void testGetQuantityAddedSingleItemPurchased() {
        testBill.addPurchase(milk, 2);
        assertEquals(2, testBill.getTotalQuantityOfItemPurchased(milk));
    }

    @Test
    void testAddSameItemMoreThanOnce() {
        testBill.addPurchase(milk, 1);
        testBill.addPurchase(tea, 1);
        testBill.addPurchase(milk, 2);
        assertEquals(2, testBill.getNumLineItems());
        assertEquals(4, testBill.getTotalNumberOfItemsPurchased());
    }

    @Test
    void testGetQuantityAddedMultipleItemsPurchased() {
        testBill.addPurchase(milk, 1);
        testBill.addPurchase(tea, 1);
        testBill.addPurchase(milk, 2);
        assertEquals(3, testBill.getTotalQuantityOfItemPurchased(milk));
        assertEquals(1, testBill.getTotalQuantityOfItemPurchased(tea));
    }

    @Test
    void testToStringSingleLineItem() {
        testBill.addPurchase(cereal, 2);
        assertEquals("2x Cereal @ $3.59\n", testBill.toString());
    }

    @Test
    void testToStringMultipleLineItems() {
        testBill.addPurchase(cereal, 2);
        testBill.addPurchase(milk, 1);
        testBill.addPurchase(tea, 1);
        testBill.addPurchase(milk, 2);
        assertEquals("2x Cereal @ $3.59\n3x Milk @ $2.99\n1x Tea @ $8.75\n", testBill.toString());
    }

    private void initGroceryItems() {
        milk = new GroceryItem("Milk", 299);
        cereal = new GroceryItem("Cereal", 359);
        tea = new GroceryItem("Tea", 875);
    }
}