breakout71/src/game_utils.test.ts

import {
  getMajorityValue,
  makeEmptyPerksMap,
  sample,
  sumOfKeys,
} from "./game_utils";
import { Upgrade } from "./types";

describe("getMajorityValue", () => {
  it("returns the most common string", () => {
    expect(
      getMajorityValue(["1", "1", "2", "2", "3", "2", "3", "2", "2", "1"]),
    ).toStrictEqual("2");
  });
  it("returns the only string", () => {
    expect(getMajorityValue(["1"])).toStrictEqual("1");
  });
  it("returns nothing for empty array", () => {
    expect(getMajorityValue([])).toStrictEqual(undefined);
  });
});
describe("sample", () => {
  it("returns a random pick from the array", () => {
    expect(["1", "2", "3"].includes(sample(["1", "2", "3"]))).toBeTruthy();
  });
  it("returns the only item if there is just one", () => {
    expect(sample(["1"])).toStrictEqual("1");
  });
  it("returns nothing for empty array", () => {
    expect(sample([])).toStrictEqual(undefined);
  });
});
describe("sumOfKeys", () => {
  it("returns the sum of the keys of an array", () => {
    expect(sumOfKeys({ a: 1, b: 2 })).toEqual(3);
  });
  it("returns 0 for an empty object", () => {
    expect(sumOfKeys({})).toEqual(0);
  });
  it("returns 0 for undefined", () => {
    expect(sumOfKeys(undefined)).toEqual(0);
  });
  it("returns 0 for null", () => {
    expect(sumOfKeys(null)).toEqual(0);
  });
});
describe("makeEmptyPerksMap", () => {
  it("returns an object", () => {
    expect(makeEmptyPerksMap([{ id: "ball_attract_ball" }])).toEqual({
      ball_attract_ball: 0,
    });
    expect(makeEmptyPerksMap([])).toEqual({});
  });
});