[Test, CloseAfterFirstFrame]
public void OffsetSeveralIncrements()
{
    const int VerticesCount = 32;
    const int IndicesCount = 48;
    var vertices = new VertexPosition2DUV[VerticesCount];
    var indices = new short[IndicesCount];
    for (int i = 1; i <= IncrementCount; i++)
    {
        buffer2D.Add(null, vertices, indices);
        Assert.AreEqual(i * VerticesCount * vertexSize, buffer2D.VertexOffset);
        Assert.AreEqual(i * IndicesCount * sizeof(short), buffer2D.IndexOffset);
    }
}

[Test, CloseAfterFirstFrame]
public void OffsetSeveralIncrements()
{
    const int VerticesCount = 32;
    const int IndicesCount = 48;
    var vertices = new VertexPosition2DUV[VerticesCount];
    var indices = new short[IndicesCount];
    for (int i = 1; i <= IncrementCount; i++)
    {
        buffer2D.Add(null, vertices, indices);
        Assert.AreEqual(i * VerticesCount * vertexSize, buffer2D.VertexOffset);
        Assert.AreEqual(i * IndicesCount * sizeof(short), buffer2D.IndexOffset);
    }
}