Quelle testObjectEmulatingUndefined.cpp Sprache: C

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "jsapi-tests/tests.h"

static const JSClass ObjectEmulatingUndefinedClass = {
    "ObjectEmulatingUndefined",
    JSCLASS_EMULATES_UNDEFINED,
};

static bool ObjectEmulatingUndefinedConstructor(JSContext* cx, unsigned argc,
                                                JS::Value* vp) {
  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
  JSObject* obj =
      JS_NewObjectForConstructor(cx, &ObjectEmulatingUndefinedClass, args);
  if (!obj) {
    return false;
  }
  args.rval().setObject(*obj);
  return true;
}

BEGIN_TEST(testObjectEmulatingUndefined_truthy) {
  CHECK(JS_InitClass(cx, global, nullptr, nullptr, "ObjectEmulatingUndefined",
                     ObjectEmulatingUndefinedConstructor, 0, nullptr, nullptr,
                     nullptr, nullptr));

  JS::RootedValue result(cx);

  EVAL("if (new ObjectEmulatingUndefined()) true; else false;", &result);
  CHECK(result.isFalse());

  EVAL("if (!new ObjectEmulatingUndefined()) true; else false;", &result);
  CHECK(result.isTrue());

  EVAL(
      "var obj = new ObjectEmulatingUndefined(); \n"
      "var res = []; \n"
      "for (var i = 0; i < 50; i++) \n"
      " res.push(Boolean(obj)); \n"
      "res.every(function(v) { return v === false; });",
      &result);
  CHECK(result.isTrue());

  return true;
}
END_TEST(testObjectEmulatingUndefined_truthy)

BEGIN_TEST(testObjectEmulatingUndefined_equal) {
  CHECK(JS_InitClass(cx, global, nullptr, nullptr, "ObjectEmulatingUndefined",
                     ObjectEmulatingUndefinedConstructor, 0, nullptr, nullptr,
                     nullptr, nullptr));

  JS::RootedValue result(cx);

  EVAL("if (new ObjectEmulatingUndefined() == undefined) true; else false;",
       &result);
  CHECK(result.isTrue());

  EVAL("if (new ObjectEmulatingUndefined() == null) true; else false;",
       &result);
  CHECK(result.isTrue());

  EVAL("if (new ObjectEmulatingUndefined() != undefined) true; else false;",
       &result);
  CHECK(result.isFalse());

  EVAL("if (new ObjectEmulatingUndefined() != null) true; else false;",
       &result);
  CHECK(result.isFalse());

  EVAL(
      "var obj = new ObjectEmulatingUndefined(); \n"
      "var res = []; \n"
      "for (var i = 0; i < 50; i++) \n"
      " res.push(obj == undefined); \n"
      "res.every(function(v) { return v === true; });",
      &result);
  CHECK(result.isTrue());

  EVAL(
      "var obj = new ObjectEmulatingUndefined(); \n"
      "var res = []; \n"
      "for (var i = 0; i < 50; i++) \n"
      " res.push(obj == null); \n"
      "res.every(function(v) { return v === true; });",
      &result);
  CHECK(result.isTrue());

  EVAL(
      "var obj = new ObjectEmulatingUndefined(); \n"
      "var res = []; \n"
      "for (var i = 0; i < 50; i++) \n"
      " res.push(obj != undefined); \n"
      "res.every(function(v) { return v === false; });",
      &result);
  CHECK(result.isTrue());

  EVAL(
      "var obj = new ObjectEmulatingUndefined(); \n"
      "var res = []; \n"
      "for (var i = 0; i < 50; i++) \n"
      " res.push(obj != null); \n"
      "res.every(function(v) { return v === false; });",
      &result);
  CHECK(result.isTrue());

  return true;
}
END_TEST(testObjectEmulatingUndefined_equal)

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