[rubygems/rubygems] Also added credential_setup to the some of tests

https://github.com/rubygems/rubygems/commit/2ac557d008

test/rubygems/test_gem_commands_yank_command.rb

@@ -7,6 +7,8 @@ class TestGemCommandsYankCommand < Gem::TestCase
   def setup
     super
 
+    credential_setup
+
     @cmd = Gem::Commands::YankCommand.new
     @cmd.options[:host] = 'http://example'
 

test/rubygems/test_gem_gemcutter_utilities.rb

@@ -8,6 +8,9 @@ class TestGemGemcutterUtilities < Gem::TestCase
 
   def setup
     super
+
+    credential_setup
+
     # below needed for random testing, class property
     Gem.configuration.disable_default_gem_server = nil