This repository contains the complete set of artifacts for our ASE 2025 paper on Disjoint Assertion Tangle (DAT) Smell detection and refactoring in unit tests.

Contains the complete source code and implementation of U2W (Untangle to Weave) - our program analysis-based tool that automatically detects and refactors Disjoint Assertion Tangles in unit tests.

What's included:

• Complete Java source code for the U2W tool
• Main executable file (Untangle2Weave.java)
• LLM Enhancement module for post-refactoring improvements
• Detailed usage instructions and examples
• Configuration options for different execution modes

Contains all research artifacts, data, and results from our comprehensive empirical evaluation of the DAT smell and U2W tool effectiveness.

What's included:

• Developer survey questions and methodology (Developer Preference Survey.pdf)
• Complete survey responses from 34 software engineers and 15 students:
  • (Industry) Unit Test Style Preference Study (Original Responses).xlsx
  • (Students) Unit Test Style Preference Study (Original Responses).xlsx
• Tool evaluation results across 49 open-source projects (Reports.xlsx)
• Original and refactored test files from all subject projects (OriginalAndRefactoredTestFiles/)
• Anonymous links to 19 submitted pull requests (16 accepted by maintainers) - see README for complete list

1. To use the U2W tool: Navigate to the U2W Source Code folder and follow the setup instructions
2. To explore research data: Check the Empirical Studies Artifacts folder for survey results, evaluation data, and example refactorings

• 95.9% of evaluated projects contained DAT smell
• 36.33% average reduction in executable test-code lines after refactoring
• 1,713 parameterized unit tests generated with average 5.85 value sets per test
• 78.9% acceptance rate for submitted pull requests based on U2W refactorings