@After
  public void tearDown() throws Exception {
    if (azureDest != null) {
      azureDest.close();
    }
  }
Utility method to get blob input stream.
@param blobSize size of blob to consider.
@return the blob input stream.
ambry-cloud/src/test/java/com/github/ambry/cloud/azure/AzureCloudDestinationTest.java