ladybird/Libraries/LibJS/Tests/builtins/Number/Number.js

test("basic functionality", () => {
  expect(Number).toHaveLength(1);
  expect(Number.name).toBe("Number");
  expect(Number.prototype).not.toHaveProperty("length");

  expect(typeof Number()).toBe("number");
  expect(typeof new Number()).toBe("object");

  expect(Number()).toBe(0);
  expect(new Number().valueOf()).toBe(0);
  expect(Number("42")).toBe(42);
  expect(new Number("42").valueOf()).toBe(42);
  expect(Number(null)).toBe(0);
  expect(new Number(null).valueOf()).toBe(0);
  expect(Number(true)).toBe(1);
  expect(new Number(true).valueOf()).toBe(1);
  expect(Number("Infinity")).toBe(Infinity);
  expect(new Number("Infinity").valueOf()).toBe(Infinity);
  expect(Number("+Infinity")).toBe(Infinity);
  expect(new Number("+Infinity").valueOf()).toBe(Infinity);
  expect(Number("-Infinity")).toBe(-Infinity);
  expect(new Number("-Infinity").valueOf()).toBe(-Infinity);
  expect(Number(undefined)).toBeNaN();
  expect(new Number(undefined).valueOf()).toBeNaN();
  expect(Number({})).toBeNaN();
  expect(new Number({}).valueOf()).toBeNaN();
  expect(Number({ a: 1 })).toBeNaN();
  expect(new Number({ a: 1 }).valueOf()).toBeNaN();
  expect(Number([1, 2, 3])).toBeNaN();
  expect(new Number([1, 2, 3]).valueOf()).toBeNaN();
  expect(Number("foo")).toBeNaN();
  expect(new Number("foo").valueOf()).toBeNaN();
});