LibTest/js_interop/ObjectToJSBoxedDartObject/toJSBox_A02_t02.dart

// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion A JavaScript object that wraps this [Object].
///
/// There are no usable members in the resulting [JSBoxedDartObject] and you may
/// get a new [JSBoxedDartObject] when calling [toJSBox] on the same Dart
/// [Object].
///
/// Throws an [Exception] if this [Object] is a JavaScript value.
///
/// Unlike [ObjectToExternalDartReference.toExternalReference], this returns a
/// JavaScript value. Therefore, the representation is guaranteed to be
/// consistent across all platforms and interop members can be declared on
/// [JSBoxedDartObjects].
///
/// @description Checks that an [Exception] is thrown if this [Object] is a
/// JavaScript value. Test non-primitive JS types.
/// @author sgrekhov22@gmail.com

import 'dart:js_interop';
import 'dart:js_interop_unsafe';
import '../../../Utils/expect.dart';
import '../js_utils.dart';

main() {
  eval(r'''
    globalThis.obj = {};
  ''');
  Expect.throws(() {
    JSArray().toJSBox;
  });

  Expect.throws(() {
    JSObject().toJSBox;
  });

  Expect.throws(() {
    (globalContext["obj"] as JSObject).toJSBox;
  });

  eval(r'''
    globalThis.foo = function(resolve, reject) {
      resolve("Success");
    };
  ''');
  Expect.throws(() {
    JSPromise(globalContext["foo"] as JSFunction).toJSBox;
  });

  var boxedObject = Object().toJSBox;
  Expect.throws(() {
    boxedObject.toJSBox;
  });
}