Cannot suppress traceback in custom handler

**Migrated from Launchpad:** https://bugs.launchpad.net/bugs/1518100

**Original Reporter:** Jonathan Lange
**Date Created:** 2015-11-19 21:48:40.279224+00:00
**Status on Launchpad:** Triaged
**Importance:** Wishlist

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I want to add a custom handler using TestCase.exception_handlers that does *not* include a traceback in details. Currently there's no way to do this.
