import { describe, expect, it } from "@jest/globals";
import { groupBy } from "./groupBy.js";

describe("groupBy", () => {
  it("groups", () => {
    expect(groupBy(new Set([1, 2, 3]), (element) => element % 2)).toEqual(
      new Set([new Set([1, 3]), new Set([2])])
    );
  });
});