public void ExportmetisGraph_WriteData_CorrectFormat()
        {
            var writerMock = new Mock <IDataWriter>();

            writerMock.Setup(metod => metod.WriteData(It.IsAny <string>()));

            var metisFileExport = new FullWeightedMetisFileExport(writerMock.Object);
            var dummyGraph      = GetDummyGraph();

            metisFileExport.ExportGraph(dummyGraph);

            writerMock.Verify(method => method.WriteData(ExportMetisFile), Times.Once);
        }