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An oracle determines whether the output of a program for executed test cases is correct. For machine learning programs, such an oracle is often unavailable or impractical to apply. Metamorphic testing addresses this by using metamorphic…

Software Engineering · Computer Science 2024-11-15 Madhusudan Srinivasan , Upulee Kanewala

An oracle is a mechanism to decide whether the outputs of the program for the executed test cases are correct. For machine learning programs, such oracle is not available or too difficult to apply. Metamorphic testing is a testing approach…

Software Engineering · Computer Science 2022-09-02 Madhusudan Srinivasan , Upulee Kanewala

Metamorphic Testing (MT) addresses the test oracle problem by examining the relationships between input-output pairs in consecutive executions of the System Under Test (SUT). These relations, known as Metamorphic Relations (MRs), specify…

Software Engineering · Computer Science 2023-10-23 Alejandra Duque-Torres , Dietmar Pfahl

Large Language Models (LLMs) are increasingly deployed in various applications, raising critical concerns about fairness and potential biases in their outputs. This paper explores the prioritization of metamorphic relations (MRs) in…

Computation and Language · Computer Science 2025-05-14 Suavis Giramata , Madhusudan Srinivasan , Venkat Naidu Gudivada , Upulee Kanewala

Metamorphic Testing (MT) is a testing technique that can effectively alleviate the oracle problem. MT uses Metamorphic Relations (MRs) to determine if a test case passes or fails. MRs specify how the outputs should vary in response to…

Software Engineering · Computer Science 2023-05-19 Alejandra Duque-Torres , Dietmar Pfahl , Claus Klammer , Stefan Fischer

Metamorphic Testing (MT) addresses the test oracle problem by examining the relations between inputs and outputs of test executions. Such relations are known as Metamorphic Relations (MRs). In current practice, identifying and selecting…

Software Engineering · Computer Science 2022-07-28 Alejandra Duque-Torres , Dietmar Pfahl , Rudolf Ramler , Claus Klammer

Software testing is often hindered where it is impossible or impractical to determine the correctness of the behaviour or output of the software under test (SUT), a situation known as the oracle problem. An example of an area facing the…

Software Engineering · Computer Science 2021-08-06 Liming Xu , Dave Towey , Andrew French , Steve Benford , Zhi Quan Zhou , Tsong Yueh Chen

In machine learning, supervised classifiers are used to obtain predictions for unlabeled data by inferring prediction functions using labeled data. Supervised classifiers are widely applied in domains such as computational biology,…

Software Engineering · Computer Science 2019-04-17 Prashanta Saha , Upulee Kanewala

Matrices often represent important information in scientific applications and are involved in performing complex calculations. But systematically testing these applications is hard due to the oracle problem. Metamorphic testing is an…

Software Engineering · Computer Science 2018-02-21 Karishma Rahman , Upulee Kanewala

Using large language models (LLMs) to perform natural language processing (NLP) tasks has become increasingly pervasive in recent times. The versatile nature of LLMs makes them applicable to a wide range of such tasks. While the performance…

Software Engineering · Computer Science 2026-01-12 Steven Cho , Stefano Ruberto , Valerio Terragni

Metamorphic testing (MT) is a simple yet effective technique to alleviate the oracle problem in software testing. The underlying idea of MT is to test a software system by checking whether metamorphic relations (MRs) hold among multiple…

Software Engineering · Computer Science 2024-12-31 An Fu , Chang-ai Sun , Jiaming Zhang , Huai Liu

Regression is one of the most commonly used statistical techniques. However, testing regression systems is a great challenge because of the absence of test oracle in general. In this paper, we show that Metamorphic Testing is an effective…

Methodology · Statistics 2021-08-24 Quang-Hung Luu , Man F. Lau , Sebastian P. H. Ng , Tsong Yueh Chen

Software testing is difficult to automate, especially in programs which have no oracle, or method of determining which output is correct. Metamorphic testing is a solution this problem. Metamorphic testing uses metamorphic relations to…

Software Engineering · Computer Science 2018-02-22 Bonnie Hardin , Upulee Kanewala

Metamorphic testing (TM) examines the relations between inputs and outputs of test runs. These relations are known as metamorphic relations (MR). Currently, MRs are handpicked and require in-depth knowledge of the System Under Test (SUT),…

Software Engineering · Computer Science 2022-07-28 Alejandra Duque-Torres , Dietmar Pfahl , Claus Klammer , Stefan Fischer

Model transformations are the cornerstone of Model-Driven Engineering, and provide the essential mechanisms for manipulating and transforming models. Checking whether the output of a model transformation is correct is a manual and…

Software Engineering · Computer Science 2018-05-01 Javier Troya , Sergio Segura , Antonio Ruiz-Cortés

Assessing the trustworthiness of Large Language Models (LLMs), such as robustness, has garnered significant attention. Recently, metamorphic testing that defines Metamorphic Relations (MRs) has been widely applied to evaluate the robustness…

Software Engineering · Computer Science 2025-07-09 Sangwon Hyun , Shaukat Ali , M. Ali Babar

Testing software is often costly due to the need of mass-producing test cases and providing a test oracle for it. This is often referred to as the oracle problem. One method that has been proposed in order to alleviate the oracle problem is…

Machine Learning · Computer Science 2020-02-19 Adrian Wildandyawan , Yasuharu Nishi

Metamorphic testing (MT) is a general approach for the testing of a specific kind of software systems -- so-called ``non-testable'', where the ``classical'' testing approaches are difficult to apply. MT is an effective approach for…

Software Engineering · Computer Science 2022-11-23 Nasser Alzahrani , Maria Spichkova , James Harland

Metamorphic Testing (MT) alleviates the oracle problem by defining oracles based on metamorphic relations (MRs), that govern multiple related inputs and their outputs. However, designing MRs is challenging, as it requires domain-specific…

Software Engineering · Computer Science 2026-04-14 Congying Xu , Valerio Terragni , Hengcheng Zhu , Jiarong Wu , Shing-Chi Cheung

Metamorphic testing (MT) alleviates the oracle problem by checking metamorphic relations (MRs) across multiple test executions. The fault detection effectiveness of MT is influenced not only by the choice and quality of MRs, but also by how…

Software Engineering · Computer Science 2025-12-16 Zenghui Zhou , Pak-Lok Poon , Zheng Zheng , Xiao-Yi Zhang
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