Foto von Fabian Leinen

Fabian Leinen, M.Sc.

Technische Universität München

Informatik 4 - Lehrstuhl für Software & Systems Engineering (Prof. Pretschner)


Boltzmannstr. 3
85748 Garching b. München

Research Focus

When testing software, we assume that a test passes if the code under test is free of faults for the input defined in the test, and that the test fails if it is not. In other words, we expect a test to be deterministic, which isn't always the case. These kinds of non-deterministic tests are called flaky tests. My research focuses on supporting developers in handling flaky tests in the context of continuous integration (CI).

Thesis Supervision

Open Topics

Please get in touch if you are interested in guided research or if you need supervision for your master's or bachelor's thesis. Throughout the entire research period, we will meet weekly to discuss results, issues, and the next steps. You will receive feedback on your thesis before submission, giving you the opportunity to further improve your work.

When applying, please include your resume and transcript so that I can assess your prior knowledge and experience.

Supporting Developers in Repairing Flaky Tests in CI

You will collect and analyze data from open-source systems to identify characteristics of flaky tests. During the project, you can acquire knowledge in the field of Continuous Integration (CI), particularly focusing on testing within CI, and enhance your data analysis skills. In case of success, if you are interested, you may also participate in a subsequent scientific publication.

Prerequisites: Basic knowledge in Data Science, fundamental understanding of CI, and proficient knowledge in at least one programming language (preferably Python).

Master/Guided Research


Finished and Ongoing Topics

Enhanced Debugging of Flaky Test Cases: Automating State Preservation for Efficient Failure Analysis Bachelor
Automatically Detecting Flaky End-to-End Test Failures Using Code Coverage (with RW) Master
Reducing Effort for Flaky Test Detection Through Resource Limitation Bachelor
Analyzing the Effectiveness of Rerunning Tests for Detecting Flaky UI Tests Bachelor
Reducing Effort for Flaky Test Detection through Dynamic Program Analysis (with DE; Rohde & Schwarz Best Bachelor Award) Bachelor
Determining Root Causes of Flaky Tests Using System Call Analysis (with DE) Master



Wuersching, R.*, Elsner, D.*, Leinen, F., Pretschner, A., Grueneissl, G., Neumeyr, T., Vosseler, T. (2023). Severity-Aware Prioritization of System-Level Regression Tests in Automotive Software. In Proceedings of the 16th IEEE International Conference on Software Testing, Verification and Validation.