Use :default from tests/.fog for test credentials

This prevents new test users from being afraid that their real accounts
may be used for fog testing when running tests without mocking.

See also #1218

.gitignore

@@ -6,6 +6,7 @@
 .bundle
 .DS_Store
 .idea
+/tests/.fog
 bin/*
 !bin/fog
 !bin/rdoc

tests/helper.rb

@@ -1,3 +1,6 @@
+ENV['FOG_RC']         = File.expand_path '../.fog', __FILE__
+ENV['FOG_CREDENTIAL'] = 'default'
+
 require 'fog'
 require 'fog/bin' # for available_providers and registered_providers
 
@@ -22,7 +25,7 @@ available_providers = Fog.available_providers.map {|provider| provider.downcase}
 unavailable_providers = all_providers - available_providers
 
 for provider in unavailable_providers
-  Formatador.display_line("[yellow]Skipping tests for [bold]#{provider}[/] [yellow]due to lacking credentials (add some to '~/.fog' to run them)[/]")
+  Formatador.display_line("[yellow]Skipping tests for [bold]#{provider}[/] [yellow]due to lacking credentials (add some to '#{Fog.credentials_path}' to run them)[/]")
   Thread.current[:tags] << ('-' << provider)
 end