rn-testing/stats.test.js at main · geekjeeyoung/rn-testing · GitHub

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const stats = require("./stats");

describe("stats", () => {
  it("gets maximum value", () => {
    expect(stats.max([1, 2, 3, 4])).toBe(4);
  });
  it("gets minimum value", () => {
    expect(stats.min([1, 2, 3, 4])).toBe(1);
  });
  it("gets average value", () => {
    expect(stats.avg([1, 2, 3, 4, 5, 6, 7])).toBe(4);
  });
  describe("median", () => {
    it("sorts the array", () => {
      expect(stats.sort([5, 4, 1, 3, 2])).toEqual([1, 2, 3, 4, 5]);
    });
    it("gets the median for odd length", () => {
      expect(stats.median([1, 2, 3, 4, 5])).toBe(3);
    });
    it("gets the median for even length", () => {
      expect(stats.median([1, 2, 3, 4, 5, 6])).toBe(3.5);
    });
  });
  describe("mode", () => {
    it("has one mode", () => {
      expect(stats.mode([1, 2, 2, 2, 3])).toBe(2);
    });
    it("has no mode", () => {
      expect(stats.mode([1, 2, 3])).toBe(null);
    });
    it("has multiple mode", () => {
      expect(stats.mode([1, 2, 2, 3, 3, 4])).toEqual([2, 3]);
    });
  });
});