Convert FORM tests to use Cetmodules

[greenc-FNAL]

• Convert test/form tests to use cet_test().

• Update writer.cpp and reader.cpp to accept filename argument.

• Pass shared data file path to tests to support parallel execution.

Run cmake-format (FORM)

[Copilot]

Pull request overview

This PR converts the FORM test suite from manually configured executables to use the Cetmodules testing framework (cet_test()). The changes enable parallel test execution by accepting a configurable output file path as a command-line argument, and properly establishes test dependencies to ensure the writer test completes before the reader test runs.

• Refactored writer.cpp and reader.cpp to accept filename as a command-line argument
• Converted CMakeLists.txt to use cet_test() instead of add_executable() and add_test()
• Configured tests to use CMAKE_CURRENT_BINARY_DIR for output files to support parallel execution

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/form/writer.cpp	Modified main() to accept and use filename argument instead of hardcoded "toy.root"
test/form/reader.cpp	Modified main() to accept and use filename argument instead of hardcoded "toy.root"
test/form/CMakeLists.txt	Converted test configuration from manual add_executable/add_test to cet_test() framework with proper dependencies and arguments

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   81.42%   81.13%   -0.30%     
==========================================
  Files         115      115              
  Lines        2046     2046              
  Branches      330      330              
==========================================
- Hits         1666     1660       -6     
- Misses        252      255       +3     
- Partials      128      131       +3     

Flag	Coverage Δ
unittests	81.13% <ø> (-0.30%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 3 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7b6b96c...5c73323. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[aolivier23]

Looks reasonable to me. Thank you for doing this! I'm trusting that cet_test() does roughly what the old CMake code did as I'm not familiar with how the cet macros work.

[gemmeren]

Thanks Chris, looks good.

[greenc-FNAL]

@aolivier23 @gemmeren I have rebased against main and addressed the remaining (not auto-resolved) comment from Copilot; I'd appreciate a re-review when you have a moment.

@aolivier23 Yes, cet_test() is more versatile than raw add_test(), but the new calls are equivalent to the old ones.

[aolivier23]

Looks good to me. Thank you for confirming about what cet_test() does and great work!

[gemmeren]

Thanks Chris, looks good.

[knoepfel]

@greenc-FNAL, can the .devcontainer changes be backed out?

[greenc-FNAL]

@greenc-FNAL, can the .devcontainer changes be backed out?

Absolutely (sorry), but I'll need one more approving review.