LibTest/core/BidirectionalIterator/movePrevious_A01_t02.test.dart

// 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.

// @dart = 2.9

/// @assertion bool movePrevious()
/// Move back to the previous element.
/// Returns true and updates current if successful. Returns false and sets
/// current to null if there is no previous element.
/// @description Checks that this method returns true and updates the
/// current if there is a previous element.
/// @author sgrekhov@unipro.ru

library movePrevious_A01_t02;
import "../../../Utils/expect.dart";

test(BidirectionalIterator create([Iterable content])) {
  BidirectionalIterator it = create([0, 1, 2, 3]);

  it.moveNext();
  it.moveNext();

  Expect.isTrue(it.movePrevious());
  Expect.equals(0, it.current);
}