Language/Expressions/Object_Identity/string_t01.dart

// Copyright (c) 2011, 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 The predefined Dart function identical() is defined such that
/// identical(c1, c2) iff:
/// . . .
///  • c1 and c2 are constant strings and c1 == c2.
/// @description Checks that two constant strings are identical() iff they are
/// equal
/// @Issue https://github.com/dart-lang/language/issues/985
/// @author ilya

import "../../../Utils/expect.dart";

const hello = 'hello, ';
const world = 'world';
const helloWorld = 'hello, world';

main() {
  Expect.isTrue(identical("", ''));
  Expect.isTrue(identical('hello, world', helloWorld));
  Expect.isTrue(identical(helloWorld, '$hello$world' ));    // See Dart Language Issue #985
  Expect.isTrue(identical(helloWorld, 'hello, ' 'world'));

  Expect.isFalse(identical(helloWorld, '$world$hello' ));
}