Sort th result to compare multiple lines

The order of the lines is depend on Dir.glob's result.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38004 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rubygems/test_gem_commands_contents_command.rb

@@ -146,7 +146,7 @@ lib/foo.rb
 #{Gem::ConfigMap[:archdir]}/default_gem.so
     EOF
 
-    assert_equal expected, @ui.output
+    assert_equal expected.lines.sort, @ui.output.line.sort
     assert_equal "", @ui.error
   end