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Flaky tests yield different results when executed multiple times for the same version of the source code. Thus, they provide an ambiguous signal about the quality of the code and interfere with the automated assessment of code changes.…

Software Engineering · Computer Science 2026-02-04 Alexander Berndt , Thomas Bach , Sebastian Baltes

Flaky tests are software tests that exhibit a seemingly random outcome (pass or fail) when run against the same, identical code. Previous work has examined fixes to flaky tests and has proposed automated solutions to locate as well as fix…

Software Engineering · Computer Science 2019-07-03 Moritz Eck , Fabio Palomba , Marco Castelluccio , Alberto Bacchelli

Background: Test flakiness is a major problem in the software industry. Flaky tests fail seemingly at random without changes to the code and thus impede continuous integration (CI). Some researchers argue that all tests can be considered…

Software Engineering · Computer Science 2024-09-17 Alexander Berndt , Thomas Bach , Sebastian Baltes

Flaky tests yield inconsistent results when they are repeatedly executed on the same code revision. They interfere with automated quality assurance of code changes and hinder efficient software testing. Previous work evaluated approaches to…

Software Engineering · Computer Science 2026-02-06 Alexander Berndt , Vekil Bekmyradov , Rainer Gemulla , Marcus Kessel , Thomas Bach , Sebastian Baltes

Background. Automated test execution is an important activity to gather information about the quality of a software project. So-called flaky tests, however, negatively affect this process. Such tests fail seemingly at random without changes…

Software Engineering · Computer Science 2026-03-02 Alexander Berndt , Zoltán Nochta , Thomas Bach

Flaky tests, which pass or fail inconsistently without code changes, are a major challenge in software engineering in general and in quantum software engineering in particular due to their complexity and probabilistic nature, leading to…

Software Engineering · Computer Science 2024-11-01 Janakan Sivaloganathan , Ainaz Jamshidi , Andriy Miranskyy , Lei Zhang

Flaky tests produce inconsistent outcomes without code changes, creating major challenges for software developers. An industrial case study reported that developers spend 1.28% of their time repairing flaky tests at a monthly cost of…

Software Engineering · Computer Science 2025-04-24 Owain Parry , Gregory Kapfhammer , Michael Hilton , Phil McMinn

Tests that cause spurious failures without any code changes, i.e., flaky tests, hamper regression testing, increase maintenance costs, may shadow real bugs, and decrease trust in tests. While the prevalence and importance of flakiness is…

Software Engineering · Computer Science 2022-02-15 Martin Gruber , Stephan Lukasczyk , Florian Kroiß , Gordon Fraser

Non-deterministic test behavior, or flakiness, is common and dreaded among developers. Researchers have studied the issue and proposed approaches to mitigate it. However, the vast majority of previous work has only considered…

Software Engineering · Computer Science 2023-10-10 Martin Gruber , Muhammad Firhard Roslan , Owain Parry , Fabian Scharnböck , Phil McMinn , Gordon Fraser

Developers always wish to ensure that their latest changes to the code base do not break existing functionality. If test cases fail, they expect these failures to be connected to the submitted changes. Unfortunately, a flaky test can be the…

Software Engineering · Computer Science 2021-09-10 Azeem Ahmad , Ola Leifler , Kristian Sandahl

Non-deterministically passing and failing test cases, so-called flaky tests, have recently become a focus area of software engineering research. While this research focus has been met with some enthusiastic endorsement from industry, prior…

Software Engineering · Computer Science 2022-04-11 Martin Gruber , Gordon Fraser

Test flakiness forms a major testing concern. Flaky tests manifest non-deterministic outcomes that cripple continuous integration and lead developers to investigate false alerts. Industrial reports indicate that on a large scale, the…

Software Engineering · Computer Science 2021-12-10 Sarra Habchi , Guillaume Haben , Mike Papadakis , Maxime Cordy , Yves Le Traon

Like classical software, quantum software systems rely on automated testing. However, their inherently probabilistic outputs make them susceptible to quantum flakiness -- tests that pass or fail inconsistently without code changes. Such…

Software Engineering · Computer Science 2026-03-11 Janakan Sivaloganathan , Ainaz Jamshidi , Andriy Miranskyy , Lei Zhang

Flaky tests are defined as tests that manifest non-deterministic behaviour by passing and failing intermittently for the same version of the code. These tests cripple continuous integration with false alerts that waste developers' time and…

Software Engineering · Computer Science 2022-07-22 Sarra Habchi , Guillaume Haben , Jeongju Sohn , Adriano Franci , Mike Papadakis , Maxime Cordy , Yves Le Traon

Much research on software testing makes an implicit assumption that test failures are deterministic such that they always witness the presence of the same defects. However, this assumption is not always true because some test failures are…

Software Engineering · Computer Science 2019-12-09 Maxime Cordy , Renaud Rwemalika , Mike Papadakis , Mark Harman

Flaky tests (tests with non-deterministic outcomes) can be problematic for testing efficiency and software reliability. Flaky tests in test suites can also significantly delay software releases. There have been several studies that attempt…

Software Engineering · Computer Science 2022-07-05 Negar Hashemi , Amjed Tahir , Shawn Rasheed

Flaky tests obstruct software development, and studying and proposing mitigations against them has therefore become an important focus of software engineering research. To conduct sound investigations on test flakiness, it is crucial to…

Software Engineering · Computer Science 2023-05-09 Martin Gruber , Gordon Fraser

Flaky tests that non-deterministically pass or fail waste developer time and slow release cycles. While large language models (LLMs) show promise for automatically repairing flaky tests, existing approaches like FlakyDoctor fail in…

Software Engineering · Computer Science 2025-11-19 Chengpeng Li , Farnaz Behrang , August Shi , Peng Liu

Flaky tests are tests that can non-deterministically pass or fail, even in the absence of code changes.Despite being a source of false alarms, flaky tests often remain in test suites once they are detected, as they also may be relied upon…

Software Engineering · Computer Science 2024-01-30 Abdulrahman Alshammari , Paul Ammann , Michael Hilton , Jonathan Bell

Non-deterministically behaving test cases cause developers to lose trust in their regression test suites and to eventually ignore failures. Detecting flaky tests is therefore a crucial task in maintaining code quality, as it builds the…

Software Engineering · Computer Science 2023-03-21 Martin Gruber , Michael Heine , Norbert Oster , Michael Philippsen , Gordon Fraser
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