ReAssert: a tool for repairing broken unit tests

Authors:
Brett Daniel;Danny Dig;Tihomir Gvero;Vilas Jagannath;Johnston Jiaa;Damion Mitchell;Jurand Nogiec;Shin Hwei Tan;Darko Marinov
Affiliations:
University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA;University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, USA
Venue:
Proceedings of the 33rd International Conference on Software Engineering
Year:
2011

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Abstract

Successful software systems continuously change their requirements and thus code. When this happens, some existing tests get broken because they no longer reflect the intended behavior, and thus they need to be updated. Repairing broken tests can be time-consuming and difficult. We present ReAssert, a tool that can automatically suggest repairs for broken unit tests. Examples include replacing literal values in tests, changing assertion methods, or replacing one assertion with several. Our experiments show that ReAssert can repair many common test failures and that its suggested repairs match developers' expectations.