ladybird/Libraries/LibJS/Tests/builtins/Object/Object.entries.js

describe("basic functionality", () => {
  test("length", () => {
    expect(Object.entries).toHaveLength(1);
    expect(Object.entries(true)).toHaveLength(0);
    expect(Object.entries(45)).toHaveLength(0);
    expect(Object.entries(-998)).toHaveLength(0);
    expect(Object.entries("abcd")).toHaveLength(4);
    expect(Object.entries([1, 2, 3])).toHaveLength(3);
    expect(Object.entries({ a: 1, b: 2, c: 3 })).toHaveLength(3);
  });

  test("entries with object", () => {
    let entries = Object.entries({ foo: 1, bar: 2, baz: 3 });

    expect(entries).toEqual([
      ["foo", 1],
      ["bar", 2],
      ["baz", 3],
    ]);
  });

  test("entries with array", () => {
    entries = Object.entries(["a", "b", "c"]);
    expect(entries).toEqual([
      ["0", "a"],
      ["1", "b"],
      ["2", "c"],
    ]);
  });

  test("ignores non-enumerable properties", () => {
    let obj = { foo: 1 };
    Object.defineProperty(obj, "getFoo", {
      value: function () {
        return this.foo;
      },
    });
    let entries = Object.entries(obj);
    expect(entries).toEqual([["foo", 1]]);
  });
});

describe("errors", () => {
  test("null argument", () => {
    expect(() => {
      Object.entries(null);
    }).toThrowWithMessage(TypeError, "ToObject on null or undefined");
  });

  test("undefined argument", () => {
    expect(() => {
      Object.entries(undefined);
    }).toThrowWithMessage(TypeError, "ToObject on null or undefined");
  });
});