public async Task BlobExistsAsync_BlobNameGiven_BlobExists()
        {
            string blobName = NewRandomString();

            _blobContainerRepository
            .Setup(_ => _.BlobExistsAsync(blobName, It.IsAny <string>()))
            .ReturnsAsync(true);

            bool exists = await _blobClient.BlobExistsAsync(blobName);

            exists
            .Should()
            .Be(true);
        }