CODEWITHSUNDEEP
mockingazure-blob-storage
Miro Georgiev
Miro Georgiev

Reputation: 53

Mock up BlobBaseClient.DownloadTo

What is the correct way to create a mock of BlobBaseClient.DownloadTo(Stream)?

So far, I have this and unfortunately the stream I'm trying to read from eventually doesn't contain anything

           var stream = new Mock<MemoryStream>();          
            var responseMock = new Mock<Response>();
            var xmlContent = @"<?xml version='1.0'?>test data</xml>";
            responseMock.Setup(r => r.Content).Returns(new BinaryData(xmlContent));
            responseMock.Setup(r => r.ContentStream).Returns(stream.Object);         
            _blobClientMock.Setup(b => b.DownloadTo(It.IsAny<MemoryStream>())).Returns(responseMock.Object);

Upvotes: 0

Views: 291

Answers (1)

SumanthMarigowda-MSFT
SumanthMarigowda-MSFT

Reputation: 2364

To DownloadTo() here. You should not be reading a response stream from this API. The method writes response data for you to the stream provided in the arguments. A mock of this method should write mock response data to stream provided in the argument, not return mock data. E.g.

byte[] xmlContent = System.Text.Encoding.UTF8.GetBytes(@"<?xml version='1.0'?>test data</xml>");
var responseMock = new Mock<Response>();
// add some headers to the response if desired
_blobClientMock.Setup(c => c.DownloadTo(It.IsAny<Stream>()))
    .Callback((Stream s) => s.Write(xmlContent))
    .Returns(responseMock);

Please treat as pseudocode

Upvotes: 1

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