[Test]
public void AddAndRemoveWhileEnumerating()
{
    foreach (int num in list)
        if (num == 5)
            list.Add(7);
        else if (num > 1)
            list.Remove(num);
    Assert.AreEqual("1, 5, 7", list.ToText());
}

[Test]
public void AddAndRemoveWhileEnumerating()
{
    foreach (int num in list)
        if (num == 5)
            list.Add(7);
        else if (num > 1)
            list.Remove(num);
    Assert.AreEqual("1, 5, 7", list.ToText());
}

[Test]
public void AddRangeOfElementsWhileEnumerating()
{
    foreach (int num in list)
        if (num == 5)
            list.AddRange(new[] { 2, 2, 2 });

[Test]
public void AddRangeOfElementsWhileEnumerating()
{
    foreach (int num in list)
        if (num == 5)
            list.AddRange(new[] { 2, 2, 2 });

[Test]
public void AddElementWhileEnumeratingInInnerLoop()
{
    foreach (int num in list)
    {
        if (num == 5)
            foreach (int num2 in list)
                if (num2 == 1)
                    list.Add(10);
        Assert.AreEqual(3, list.Count);
    }
    Assert.AreEqual(4, list.Count);
    list.Remove(10);
    Assert.AreEqual(3, list.Count);
}

[Test]
public void AddElementWhileEnumeratingInInnerLoop()
{
    foreach (int num in list)
    {
        if (num == 5)
            foreach (int num2 in list)
                if (num2 == 1)
                    list.Add(10);
        Assert.AreEqual(3, list.Count);
    }
    Assert.AreEqual(4, list.Count);
    list.Remove(10);
    Assert.AreEqual(3, list.Count);
}

[Test]
public void TestCloningChangeableList()
{
    foreach (int num1 in list)
    {
        Assert.AreEqual(1, num1);
        list.Add(1);
        var testList2 = new ChangeableList<int>(list);
        foreach (int num2 in testList2)
        {
            Assert.AreEqual(1, num2);
            testList2.Add(2);
            // The lists should be different here (testList2 is cloned)
            Assert.False(list == testList2);
            // But the data in it should be still equal.
            Assert.AreEqual(list.ToText(), testList2.ToText());
            break;
        }
        break;
    }
}

[Test]
public void TestCloningChangeableList()
{
    foreach (int num1 in list)
    {
        Assert.AreEqual(1, num1);
        list.Add(1);
        var testList2 = new ChangeableList<int>(list);
        foreach (int num2 in testList2)
        {
            Assert.AreEqual(1, num2);
            testList2.Add(2);
            // The lists should be different here (testList2 is cloned)
            Assert.False(list == testList2);
            // But the data in it should be still equal.
            Assert.AreEqual(list.ToText(), testList2.ToText());
            break;
        }
        break;
    }
}

[Test]
public void GetEmulatorAndResetAndClearIt()
{
    Assert.IsFalse(list.IsReadOnly);
    var emulator = list.GetEnumerator();
    Assert.AreEqual(emulator.Current, 0);
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.Reset();
    list.Clear();
}

[Test]
public void GetEmulatorAndResetAndClearIt()
{
    Assert.IsFalse(list.IsReadOnly);
    var emulator = list.GetEnumerator();
    Assert.AreEqual(emulator.Current, 0);
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.Reset();
    list.Clear();
}

[Test]
public void ConvertChangebleListToArray()
{
    var array = list.ToArray();
    Assert.AreEqual(new[] { 1, 3, 5 }, array);
}

[Test]
public void ConvertChangebleListToArray()
{
    var array = list.ToArray();
    Assert.AreEqual(new[] { 1, 3, 5 }, array);
}

[Test]
public void RemoveItemFromList()
{
    list.RemoveAt(1);
    Assert.AreEqual(new List<int> { 1, 5 }, list);
}

[Test]
public void RemoveItemFromList()
{
    list.RemoveAt(1);
    Assert.AreEqual(new List<int> { 1, 5 }, list);
}

[Test]
public void RemoveItemFromListFromEnumerationDepth()
{
    list.Remove(5);
    var emulator = list.GetEnumerator();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.Reset();
    list.RemoveAt(1);
    Assert.AreEqual(new List<int> { 1, 3 }, list);
}

[Test]
public void RemoveItemFromListFromEnumerationDepth()
{
    list.Remove(5);
    var emulator = list.GetEnumerator();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.MoveNext();
    emulator.Reset();
    list.RemoveAt(1);
    Assert.AreEqual(new List<int> { 1, 3 }, list);
}

[Test]
public void RemoveItemImmediatelyAfterAddingWhileEnumerating()
{
    foreach (int num in list)
    {
        list.Add(9);
        list.Remove(9);
    }
    Assert.IsFalse(list.Contains(9));
}

[Test]
public void RemoveItemImmediatelyAfterAddingWhileEnumerating()
{
    foreach (int num in list)
    {
        list.Add(9);
        list.Remove(9);
    }
    Assert.IsFalse(list.Contains(9));
}