Legacy Argent Rose tests with 100% coverage but some mutants still alive

ArgentRoseStore.test.ts

import {ArgentRoseStore} from "../src/ArgentRoseStore";
import {Product} from "../src/Product";

describe("ArgentRoseStore", () => {
    it("Regular Product decreases quality by two", async () => {
        const store = storeIncluding(regularProduct(5, 10));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(regularProduct(4, 8)));
    });

    it("Expired Regular Product decreases quality twice as fast", async () => {
        const store = storeIncluding(regularProduct(0, 10));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(regularProduct(-1, 6)));
    });

    it("Regular Product quality is never below the minimum quality", async () => {
        const store = storeIncluding(regularProduct(2, 1));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(regularProduct(1, 0)));
    });

    it("Expired Regular Product quality is never below the minimum quality", async () => {
        const store = storeIncluding(regularProduct(0, 3));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(regularProduct(-1, 0)));
    });

    it("Lanzarote Wine increases quality by one", async () => {
        const store = storeIncluding(lanzaroteWine(3, 10));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(lanzaroteWine(2, 12)));
    });

    it("Expired Lanzarote Wine increases quality twice as fast", async () => {
        const store = storeIncluding(lanzaroteWine(0, 10));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(lanzaroteWine(-1, 14)));
    });

    it("Lanzarote Wine quality never increases over the maximum quality", async () => {
        const store = storeIncluding(lanzaroteWine(3, 50));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(lanzaroteWine(2, 50)));
    });

    it("Expired Lanzarote Wine quality never increases over the maximum quality", async () => {
        const store = storeIncluding(lanzaroteWine(0, 50));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(lanzaroteWine(-1, 50)));
    });

    it("Expired Theatre Passes' quality drops to zero", async () => {
        const store = storeIncluding(theatrePasses(0, 5));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(theatrePasses(-1, 0)));
    });

    it("Theatre Passes increase quality by three when sell-in is near", async () => {
        const store = storeIncluding(theatrePasses(3, 12));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(theatrePasses(2, 15)));
    });

    it("Theatre Pass quality never increases over the maximum quality when sell-in is near", async () => {
        const store = storeIncluding(theatrePasses(2, 48));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(theatrePasses(1, 50)));
    });

    it("Theatre Passes increase quality by one when sell-in is far away", async () => {
        const store = storeIncluding(theatrePasses(9, 12));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(theatrePasses(8, 13)));
    });

    it("Theatre Pass quality never increases over the maximum quality when sell-in is far away", async () => {
        const store = storeIncluding(theatrePasses(9, 50));

        await store.update();

        expect(store.getSavedInventory()).toEqual(inventoryIncluding(theatrePasses(8, 50)));
    });

    function regularProduct(sellIn: number, quality: number): Product {
        return new Product("Regular Product", sellIn, quality);
    }

    function lanzaroteWine(sellIn: number, quality: number): Product {
        return new Product("Lanzarote Wine", sellIn, quality);
    }

    function theatrePasses(sellIn: number, quality: number): Product {
        return new Product("Theatre Passes", sellIn, quality);
    }

    function storeIncluding(...products: Product[]): ArgentRoseStoreForTesting {
        return new ArgentRoseStoreForTesting(products);
    }

    function inventoryIncluding(...products: Product[]): Product[] {
        return products;
    }
});

export class ArgentRoseStoreForTesting extends ArgentRoseStore {
    private savedInventory: Product[];
    private readonly initialInventory: Product[];

    constructor(initialInventory: Product[]) {
        super();
        this.savedInventory = [];
        this.initialInventory = initialInventory;
    }

    getSavedInventory(): Product[] {
        return this.savedInventory;
    }

    protected async saveInventoryToDb(inventory: Product[]): Promise<void> {
        this.savedInventory = inventory;
    }

    protected async getInventoryFromDB(): Promise<Product[]> {
        return this.initialInventory;
    }
}