Segura Rueda, SergioFraser, GordonSánchez Jerez, Ana BelénRuiz Cortés, Antonio2016-03-092016-03-092016-02-29Segura Rueda, S., Fraser, G., Sánchez Jerez, A.B. y Ruiz Cortés, A. (2016). A Survey on Metamorphic Testing. IEEE Transactions on Software Engineering, 42 (9)0098-5589http://hdl.handle.net/11441/38271A test oracle determines whether a test execution reveals a fault, often by comparing the observed program output to the expected output. This is not always practical, for example when a program’s input-output relation is complex and difficult to capture formally. Metamorphic testing provides an alternative, where correctness is not determined by checking an individual concrete output, but by applying a transformation to a test input and observing how the program output “morphs” into a different one as a result. Since the introduction of such metamorphic relations in 1998, many contributions on metamorphic testing have been made, and the technique has seen successful applications in a variety of domains, ranging from web services to computer graphics. This article provides a comprehensive survey on metamorphic testing: It summarises the research results and application areas, and analyses common practice in empirical studies of metamorphic testing as well as the main open challenges.application/pdfenghttp://creativecommons.org/licenses/by-nc-nd/4.0/metamorphic testingoracle problemsurveyinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1109/TSE.2016.2532875