test("basic functionality", () => {
    // FIXME: update when toString is spec-compliant
    expect(RegExp().toString()).toBe("//");
    expect(RegExp(undefined).toString()).toBe("//");
    expect(RegExp("foo").toString()).toBe("/foo/");
    expect(RegExp("foo", undefined).toString()).toBe("/foo/");
    expect(RegExp("foo", "g").toString()).toBe("/foo/g");
    expect(RegExp(undefined, "g").toString()).toBe("//g");
});