public async Task CreateFolderAsync_CreatesFolderOnDisk() { string result = null; var project = UnconfiguredProjectFactory.Create(filePath: @"C:\Root.csproj"); var fileSystem = IFileSystemFactory.ImplementCreateDirectory((path) => { result = path; }); var storage = CreateInstance(fileSystem: fileSystem, project: project); await storage.CreateFolderAsync("Folder"); Assert.Equal(@"C:\Folder", result); }