System.Collections.Tests.QueueTests.Contains_NonExistentObject C# (CSharp) Method

        public static void Contains_NonExistentObject()
        {
            Queue queue1 = Helpers.CreateIntQueue(100);
            Helpers.PerformActionOnAllQueueWrappers(queue1, queue2 =>
            {
                Assert.False(queue2.Contains(101));
                Assert.False(queue2.Contains("hello world"));
                Assert.False(queue2.Contains(null));

                queue2.Enqueue(null);
                Assert.False(queue2.Contains(-1)); // We have a null item in the list, so the algorithm may use a different branch 
            });
        }