// Copyright (c) 2016, 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 String join([String separator = ""])
/// Converts each element to a String and concatenates the strings.
///
/// Iterates through elements of this iterable, converts each one to a String by
/// calling Object.toString, and then concatenates the strings, with the
/// separator string interleaved between the elements.
/// @description Checks that join(separator) Iterates through elements of this
/// iterable, converts each one to a String by calling Object.toString, and then
/// concatenates the strings
/// @author sgrekhov@unipro.ru

library join_A02_t01;

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

check(Iterable a, String separator) {
  Iterator i = a.iterator;
  String expected = "";
  String s = "";
  while (i.moveNext()) {
    expected += s + i.current.toString();
    s = separator;
  }
  Expect.equals(expected, a.join(separator));
}

test(Iterable create([Iterable content])) {
  check(create([]), ",");
  check(create([null]), ",");
  check(create([1, 2, 3, null, 10, 5]), ":");
}