public void TestEditSelectedFiles()
{
var operationsFactoryMock = new Mock <IOperationsFactory>();
var directoryServiceMock = new Mock <IDirectoryService>();
var fileServiceMock = new Mock <IFileService>();
var fileOpeningServiceMock = new Mock <IFileOpeningService>();
fileOpeningServiceMock
.Setup(m => m.Open(FileName))
.Verifiable();
var pathServiceMock = new Mock <IPathService>();
IOperationsService operationsService = new OperationsService(
operationsFactoryMock.Object,
directoryServiceMock.Object,
fileOpeningServiceMock.Object,
fileServiceMock.Object,
pathServiceMock.Object);
operationsService.EditFiles(new[] { FileName });
fileOpeningServiceMock.Verify(m => m.Open(FileName), Times.Once());
}