Debug for sporadical failures on RubyCI

Author: nobu

test/rubygems/test_gem_command_manager.rb

@@ -89,7 +89,13 @@ def test_find_command_unknown_suggestions
       actual_message = e.message
     end
 
-    assert_equal message, actual_message
+    assert_equal message, actual_message, proc {|msg|
+      msg + {
+         unknown_command: e.unknown_command,
+        spell_checker: e.spell_checker,
+        corrections: e.corrections,
+      }.pretty_inspect
+    }
   end
 
   def test_run_interrupt