backblaze authenticated_url spec added

Author: kevivmatrix

spec/storage/fog_helper.rb

@@ -483,7 +483,7 @@ def check_file
           end
 
           it "should have an authenticated_url" do
-            if ['AWS', 'Rackspace', 'Google', 'OpenStack', 'AzureRM', 'Aliyun'].include?(@provider)
+            if ['AWS', 'Rackspace', 'Google', 'OpenStack', 'AzureRM', 'Aliyun', 'backblaze'].include?(@provider)
               expect(@fog_file.authenticated_url).not_to be_nil
             end
           end