Issue #1999 has been updated by Hongli Lai. File tempfile-creation-error.diff added Here is a patch which implements the CreationError exception class, as documented in the Tempfile API documentation. However, I could not write a unit test for it because there seems to be no mocking/stubbing framework that I could use. ---------------------------------------- http://redmine.ruby-lang.org/issues/show/1999 ---------------------------------------- http://redmine.ruby-lang.org