Trouble testing with mocks around Blob stoarge

[Hammatt]

Hi,
I have an Azure function which I'm trying to test using mocks, using the moq library.
I have had lots of success with this library, but have recently been having issues around two different things:

1. Issues around trying to mock the value of an ETag. Because the BlobProperties Properties are not virtual, they cannot be mocked
2. Issues around trying to mock the value of CloudBlob.Container. Once again, because this property is not virtual.

Here's a sample error message I'm getting trying to mock this library:

System.NotSupportedException: Invalid setup on a non-virtual (overridable in VB) member: inBlob => inBlob.Properties

Is there any reason that these particular things are not virtual, while many other things are?
Or is there another better solution which you would suggest to trying to test around this azure storage library?

I see that there has been work done in this area in the past, #465

Thanks

[LeGaryGary]

I am having trouble overriding/mocking the CopyState property on the type CloudBlockBlob as it is sealed. Does this need to be sealed?

[vijay489]

is there any way to mock CloudAppendBlob , i am facing issues while trying to mock Azure blob storage container.

[chriswill]

In version 9.3.3 of the storage library, CreateCloudBlobClient() was a virtual method, so it could be mocked. In current versions, CreateCloudBlobClient() is static so it is not possible to be mocked with most open source mocking tools.

Since I moved my open source library to the 10.x versions I lost a lot of unit testing functionality.