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); }