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[英]How is the prefix parameter used in CloudBlobContainer.ListBlobs() to get files from a virtual folder in Azure blob storage
[英]Azure Blob Storage: Mocking CloudBlobContainer
我正在嘗試對一個將文件上傳到 Azure Blob 存儲的類進行單元測試。 上傳方法以CloudBlobContainer
作為輸入。 調用_storageContainer.Object.GetBlockBlobReference()
,會拋出 System.NullReferenceException。 有人可以幫我嘲笑這個嗎?
單元測試代碼:
[TestClass()]
public class BlobStorageServiceUploadUnitTest
{
private static BlobStorageService _service;
private static Mock<CloudBlobContainer> _storageContainer;
private static List<FileType> _extensions;
private static int _maxSize;
[ClassInitialize]
public static void Setup_Service(TestContext context)
{
_extensions = new List<FileType> { FileType.Image };
_maxSize = 2048;
_storageContainer = new Mock<CloudBlobContainer>();
_service = new BlobStorageService(new Mock<BEntitiesContainer>().Object, _storageContainer.Object);
}
[TestMethod()]
public void When_FileIsDeleted()
{
var file = CreateMockFile("test.jpg", 500000);
var blob = _storageContainer.Object.GetBlockBlobReference("deleteTest.jpg");
blob.UploadFromStream(file.Object.InputStream);
_service.DeleteFromStorage("deleteTest.jpg");
var blobs = _storageContainer.Object.ListBlobs();
Assert.AreEqual(0, blobs.Count());
}
public Mock<HttpPostedFileBase> CreateMockFile(string fileName, int sizeInBytes)
{
var file = new Mock<HttpPostedFileBase>();
var stream = new MemoryStream();
var bmp = new Bitmap(1, 1);
var graphics = Graphics.FromImage(bmp);
graphics.FillRectangle(Brushes.Black, 0, 0, 1, 1);
bmp.Save(stream, ImageFormat.Jpeg);
file.Setup(pf => pf.InputStream).Returns(stream);
file.Setup(f => f.FileName).Returns(fileName);
file.Setup(f => f.ContentLength).Returns(sizeInBytes);
return file;
}
}
測試類:
public class BlobStorageService : BaseRepository<User>
{
private CloudBlobContainer _storageContainer;
public BlobStorageService(BEntitiesContainer context, CloudBlobContainer storageContainer) : base(context)
{
Context = context;
_storageContainer = storageContainer;
}
public void DeleteFromStorage(string fileName)
{
_storageContainer.GetBlockBlobReference(fileName).DeleteIfExists();
}
}
您只能做的一件事是將 CloudBlobContainer 操作移動到具有抽象實現的單獨服務。 在這種情況下,您將能夠模擬該服務,而根本不需要接觸 Azure 類。
例如:
public interface IAzureServiceWrapper
{
CloudBlockBlob GetBlockBlobReference(CloudBlobContainer storageContainer, string fileName);
}
public class AzureServiceWrapper : IAzureServiceWrapper
{
public CloudBlockBlob GetBlockBlobReference(CloudBlobContainer storageContainer, string fileName)
{
storageContainer.GetBlockBlobReference(fileName).DeleteIfExists();
}
}
在這種情況下,模擬 AzureServiceWrapper 將非常容易,該解決方案將解決在單元測試中使用 Azure 類的所有問題。 您只需要在 BlobStorageService 中使用 AzureServiceWrapper 而不是 CloudBlobContainer。
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