ladybird/Libraries/LibJS/Tests/builtins/JSON/JSON.stringify-proxy.js

test("basic functionality", () => {
  let p = new Proxy([], {
    get(_, key) {
      if (key === "length") return 3;
      return Number(key);
    },
  });

  expect(JSON.stringify(p)).toBe("[0,1,2]");
  expect(JSON.stringify([[new Proxy(p, {})]])).toBe("[[[0,1,2]]]");
});