jerryscript/tests/jerry/unicode-format-control-characters.js

// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

function checkSyntax (str) {
  try {
    eval (str);
    assert (false);
  } catch (e) {
    assert (e instanceof SyntaxError);
  }
}

// Only \u200C-Zero width non-joiner, and \u200D-Zero width joiner are allowed

checkSyntax ("_\u200b\u200d");
checkSyntax ("_\u200c\u200e");

var _\u200c\u200d = 5;

assert (_\u200c\u200d === 5);