public static VariantMatchStructure CreateVariantMatchStructure(this CompilerTestBase test, Diagram parentDiagram, int diagramCount)
        {
            var variantMatchStructure = new VariantMatchStructure(parentDiagram);

            for (int i = 0; i < diagramCount - 1; ++i)
            {
                variantMatchStructure.CreateDiagram();
            }
            return(variantMatchStructure);
        }