Who’s to Blame? Rethinking the Brittleness of Automated Web GUI Testing from a Pragmatic Perspective
Bibliographic record
Abstract
Automated web GUI testing is important for software quality, however, its effectiveness is often undermined by test case brittleness, especially in continuously evolving real-world applications. In this experience paper, we pragmatically investigate the root causes of brittleness. We first analyze why legacy test cases, derived from the Mind2Web dataset, fail when executed on current web application versions. Our findings reveal that brittleness stems from multifaceted factors, including test script design, web application complexity, and automation framework limitations. A longitudinal study further shows that 81.7% of repaired tests break again within six months, primarily due to similar recurring issues, highlighting the persistent nature of brittleness. We further demonstrate that Large Language Models, when provided with human-like diagnostic context, can successfully repair a substantial portion of these brittle tests, though human expertise remains important for more complex scenarios. Our findings emphasize that brittleness is a multifaceted problem requiring collaboration between different parts involved in the automation testing.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.050 | 0.222 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.004 | 0.001 |
| Science and technology studies | 0.002 | 0.008 |
| Scholarly communication | 0.007 | 0.010 |
| Open science | 0.003 | 0.004 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".