Only run mocked tests by default

This allows tests to run and pass without requiring network access or
credentials to services the user does not have.

See also #1218

Rakefile

@@ -59,7 +59,7 @@ namespace :test do
 end
 
 task :test do
-  Rake::Task[:mock_tests].invoke && Rake::Task[:real_tests].invoke
+  Rake::Task[:mock_tests].invoke
 end
 
 def tests(mocked)