Output error backtrace (#318)

* Output error backtrace

Signed-off-by: Omer Demirok <odemirok@chef.io>

* Inclute error message

Signed-off-by: Omer Demirok <odemirok@chef.io>

* Include error message

Signed-off-by: Omer Demirok <odemirok@chef.io>

libraries/azure_backend.rb

@@ -51,6 +51,13 @@ def initialize(opts = {})
       resource_fail(message)
       raise StandardError, message
     end
+
+    # We can't raise an error due to `InSpec check` builds up a dummy backend and any error at this stage fails it.
+    unless @azure.credentials.values.compact.delete_if(&:empty?).size == 4
+      Inspec::Log.error 'The following must be set in the Environment:'\
+        " #{@azure.credentials.keys}.\n"\
+        "Missing: #{@azure.credentials.keys.select { |key| @azure.credentials[key].nil? }}"
+    end
   end
 
   private
@@ -447,7 +454,7 @@ def catch_failed_resource_queries
     message = "Unable to get information from the REST API for #{@__resource_name__}: #{@display_name}.\n#{e.message}"
     resource_fail(message)
   rescue StandardError => e
-    message = "Resource is failed due to #{e}"
+    message = "Resource is failed due to #{e}. Error backtrace:#{e.backtrace.join(' ')}"
     resource_fail(message)
   end
 

test/unit/resources/helper.rb

@@ -1,4 +1,4 @@
 require 'minitest/autorun'
 require 'minitest/unit'
 require 'minitest/pride'
-require 'inspec/resource'
+require 'inspec'