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

        public static void GetEnumerator_Invalid()
        {
            var queue1 = Helpers.CreateIntQueue(100);
            Helpers.PerformActionOnAllQueueWrappers(queue1, queue2 =>
            {
                IEnumerator enumerator = queue2.GetEnumerator();
                Assert.Throws<InvalidOperationException>(() => enumerator.Current);

                // If the underlying collection is modified, MoveNext and Reset throw, but Current doesn't
                enumerator.MoveNext();
                object dequeued = queue2.Dequeue();
                Assert.Throws<InvalidOperationException>(() => enumerator.MoveNext());
                Assert.Throws<InvalidOperationException>(() => enumerator.Reset());
                Assert.Equal(dequeued, enumerator.Current);


                // Current throws if the current index is < 0 or >= count
                enumerator = queue2.GetEnumerator();
                while (enumerator.MoveNext()) ;

                Assert.False(enumerator.MoveNext());
                Assert.False(enumerator.MoveNext());

                Assert.Throws<InvalidOperationException>(() => enumerator.Current);

                // Current throws after resetting
                enumerator = queue2.GetEnumerator();
                Assert.True(enumerator.MoveNext());
                Assert.True(enumerator.MoveNext());

                enumerator.Reset();
                Assert.Throws<InvalidOperationException>(() => enumerator.Current);
            });
        }