add DCE challenge data as test data

[petravanhoudt]

TF 6.2 has DRO test data that we can use for testing in several functionalities

[pradeeep-pal]

Subject: GSoC 2026 Proposal: Robust Automated Testing for ASL Method Section I hope you’re doing well.I am Pradeep Pal, a final-year BCA student. I have recently submitted my GSoC 2026 project proposal for OSIPI titled "Robust Automated Testing and CI/CD Integration for ASL Method Section".Having audited the ASL-Method-Section-Generator repository, I've identified that moving from manual verification to an automated Pytest-native engine could significantly improve the tool’s reliability and scientific accuracy. My proposal focuses on:

• Building a Unified Test Interface using Pydantic-based schemas for MRI metadata.
• Implementing a Multi-platform GitHub Actions pipeline to ensure stability across Linux, macOS, and Windows.
• Creating an I/O Comparison Engine for cross-verifying generated paragraphs against "Gold Standard" benchmarks.I have already drafted a sample unit test using Pytest fixtures to demonstrate how we can mock MRI metadata (BIDS/JSON) and validate parameter extraction.I am very eager to contribute to OSIPI's mission of standardizing perfusion imaging. Please let me know if there are any specific areas of the repository you'd like me to focus on or if you have any feedback on my proposed roadmap.Best regards,
  Pradeep Pal
  GitHub: https://github.com/pradeeep-pal