gilded-rose.test.js

const tick = require("./");

expect.extend({
  toMatchSellInAndQuality(received, sellIn, quality) {
    const receivedValues = `[sellIn: ${received.sellIn}, quality: ${received.quality}]`;
    const expectedValues = `[sellIn: ${sellIn}, quality: ${quality}]`;
    const valuesComparison = `\n  Received ${receivedValues}\n  Expected ${expectedValues}`;
    if (received.sellIn === sellIn && received.quality === quality) {
      return {
        pass: true,
        message: () => `expected values not to match:${valuesComparison}`
      }
    }
    return {
      pass: false,
      message: () => `expected values to match:${valuesComparison}`
    }
  },
});

describe("Gilded Rose", () => {
  describe("Normal Item", () => {
    test("before sell date", () => {
      const item = { name: "Normal Item", sellIn: 5, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(4, 9);
    });

    test("on sell date", () => {
      const item = { name: "Normal Item", sellIn: 0, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 8);
    });

    test("after sell date", () => {
      const item = { name: "Normal Item", sellIn: -10, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-11, 8);
    });

    test("of zero quality", () => {
      const item = { name: "Normal Item", sellIn: 5, quality: 0 };
      expect(tick(item)).toMatchSellInAndQuality(4, 0);
    });
  });

  describe("Aged Brie", () => {
    test("before sell date", () => {
      const item = { name: "Aged Brie", sellIn: 5, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(4, 11);
    });

    test("with max quality", () => {
      const item = { name: "Aged Brie", sellIn: 5, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(4, 50);
    });

    test("on sell date", () => {
      const item = { name: "Aged Brie", sellIn: 0, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 12);
    });

    test("on sell date near max quality", () => {
      const item = { name: "Aged Brie", sellIn: 0, quality: 49 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 50);
    });

    test("on sell date with max quality", () => {
      const item = { name: "Aged Brie", sellIn: 0, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 50);
    });

    test("after sell date", () => {
      const item = { name: "Aged Brie", sellIn: -10, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-11, 12);
    });

    test("after sell date with max quality", () => {
      const item = { name: "Aged Brie", sellIn: -10, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(-11, 50);
    });
  });

  describe("Legendary Item (Sulfuras, Hand of Ragnaros)", () => {
    test("before sell date", () => {
      const item = { name: "Sulfuras, Hand of Ragnaros", sellIn: 5, quality: 80 };
      expect(tick(item)).toMatchSellInAndQuality(5, 80);
    });

    test("on sell date", () => {
      const item = { name: "Sulfuras, Hand of Ragnaros", sellIn: 0, quality: 80 };
      expect(tick(item)).toMatchSellInAndQuality(0, 80);
    });

    test("after sell date", () => {
      const item = { name: "Sulfuras, Hand of Ragnaros", sellIn: -10, quality: 80 };
      expect(tick(item)).toMatchSellInAndQuality(-10, 80);
    });
  });

  describe("Backstage Pass", () => {
    test("long before sell date", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 11, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(10, 11);
    });

    test("long before sell date at max quality", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 11, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(10, 50);
    });

    test("medium close to sell date upper bound", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 10, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(9, 12);
    });

    test("medium close to sell date upper bound at max quality", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 10, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(9, 50);
    });

    test("medium close to sell date lower bound", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 6, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(5, 12);
    });

    test("medium close to sell date lower bound at max quality", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 6, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(5, 50);
    });

    test("very close to sell date upper bound", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 5, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(4, 13);
    });

    test("very close to sell date upper bound at max quality", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 5, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(4, 50);
    });

    test("very close to sell date lower bound", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 1, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(0, 13);
    });

    test("very close to sell date lower bound at max quality", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 1, quality: 50 };
      expect(tick(item)).toMatchSellInAndQuality(0, 50);
    });

    test("on sell date", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 0, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 0);
    });

    test("after sell date", () => {
      const item = { name: "Backstage passes to a TAFKAL80ETC concert", sellIn: -10, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-11, 0);
    });
  });

  describe.skip("Conjured Item", () => {
    test("before sell date", () => {
      const item = { name: "Conjured Mana Cake", sellIn: 5, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(4, 8);
    });

    test("before sell date at zero quality", () => {
      const item = { name: "Conjured Mana Cake", sellIn: 5, quality: 0 };
      expect(tick(item)).toMatchSellInAndQuality(4, 0);
    });

    test("on sell date", () => {
      const item = { name: "Conjured Mana Cake", sellIn: 0, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 6);
    });

    test("on sell date at zero quality", () => {
      const item = { name: "Conjured Mana Cake", sellIn: 0, quality: 0 };
      expect(tick(item)).toMatchSellInAndQuality(-1, 0);
    });

    test("after sell date", () => {
      const item = { name: "Conjured Mana Cake", sellIn: -10, quality: 10 };
      expect(tick(item)).toMatchSellInAndQuality(-11, 6);
    });

    test("after sell date at zero quality", () => {
      const item = { name: "Conjured Mana Cake", sellIn: -10, quality: 0 };
      expect(tick(item)).toMatchSellInAndQuality(-11, 0);
    });
  });
});