contains-solution.spec.js

const contains = require("./contains-solution");

describe("contains", () => {
  const meaningOfLifeArray = [42];
  const object = {
    data: {
      duplicate: "e",
      stuff: {
        thing: {
          banana: NaN,
          moreStuff: {
            something: "foo",
            answer: meaningOfLifeArray,
          },
        },
      },
      info: {
        duplicate: "e",
        magicNumber: 44,
        empty: null,
      },
    },
  };

  test("true if the provided number is a value within the object", () => {
    expect(contains(object, 44)).toBe(true);
  });

  test("true if the provided string is a value within the object", () => {
    expect(contains(object, "foo")).toBe(true);
  });

  test("does not convert input string into a number when searching for a value within the object", () => {
    expect(contains(object, "44")).toBe(false);
  });

  test("false if the provided string is not a value within the object", () => {
    expect(contains(object, "bar")).toBe(false);
  });

  test("true if provided string is within the object, even if duplicated", () => {
    expect(contains(object, "e")).toBe(true);
  });

  test("true if the object contains the same object by reference", () => {
    expect(contains(object, meaningOfLifeArray)).toBe(true);
  });

  test("false if no matching object reference", () => {
    expect(contains(object, [42])).toBe(false);
  });

  test("true if NaN is a value within the object", () => {
    expect(contains(object, NaN)).toBe(true);
  });

  test("true if the provided value exists and is null", () => {
    expect(contains(object, null)).toBe(true);
  });
});