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

test("constructs properly", () => {
  expect(() => {
    new Proxy({}, {});
  }).not.toThrow();
});

test("constructor argument count", () => {
  expect(() => {
    new Proxy();
  }).toThrowWithMessage(TypeError, "Proxy constructor requires at least two arguments");

  expect(() => {
    new Proxy({});
  }).toThrowWithMessage(TypeError, "Proxy constructor requires at least two arguments");
});

test("constructor requires objects", () => {
  expect(() => {
    new Proxy(1, {});
  }).toThrowWithMessage(
    TypeError,
    "Expected target argument of Proxy constructor to be object, got 1"
  );

  expect(() => {
    new Proxy({}, 1);
  }).toThrowWithMessage(
    TypeError,
    "Expected handler argument of Proxy constructor to be object, got 1"
  );
});

test("constructor must be invoked with 'new'", () => {
  expect(() => {
    Proxy({}, {});
  }).toThrowWithMessage(TypeError, "Proxy must be called with the 'new' operator");
});