[womputer]

Update VariationalRegistration tests to ITK conventions and retain failures while continuing independent checks. Guard pixel comparisons behind successful image updates. Fixes #6355.

Implementation

Rename both tests and their CMake registrations with the itk prefix. Replace manual exception checks and Print calls with ITK testing macros. Immediately invoked lambdas confine macro early returns to individual checks; an integer testStatus accumulates their results. Reset the registration pipeline between update scenarios.

Remove unused helpers, use explicit constants and casts, and apply the repository's formatting. Registration settings and the ten-pixel comparison tolerance are unchanged.

Local validation

macOS arm64, Apple clang 17.0.0, Release build with Module_VariationalRegistration enabled:

cmake --build build --target VariationalRegistrationTestDriver --parallel 4
ctest --test-dir build --output-on-failure -R '^itkVariationalRegistration(Filter|MultiResolutionFilter)Test$'

CTest output after restoring the temporary fault injections:

100% tests passed out of 2
Total Test time (real) =   1.30 sec

Fault-harness output (each check asserts exit code 1 and the expected later output; update failures must skip pixel access):

pixel-failure itkVariationalRegistrationFilterTest verified: failure exit and expected subsequent behavior
pixel-failure itkVariationalRegistrationMultiResolutionFilterTest verified: failure exit and expected subsequent behavior
update-failure itkVariationalRegistrationFilterTest verified: failure exit and expected subsequent behavior
update-failure itkVariationalRegistrationMultiResolutionFilterTest verified: failure exit and expected subsequent behavior
missing-expected-exception itkVariationalRegistrationFilterTest verified: failure exit and expected subsequent behavior

The complete ITK suite and external-data image-baseline tests were not run. Cross-platform CI remains pending.

AI assistance

OpenAI Codex assisted with code inspection, implementation, style cleanup, and local validation, including temporary failure injection. Contributor review remains in progress; this PR stays in Draft until that review and CI are complete.

PR Checklist

• No API changes were made.
• No major design changes were made.
• Updated existing tests; registration behavior unchanged. Temporary failure-path validation described above.
• API documentation unchanged because API is unchanged.
• Existing license headers retained in renamed test files.
• Python wrapping: not applicable to C++ test-only changes.
• ITK examples: not applicable; no new major feature.

Failure-continuation reproduction

Temporarily force the pixel comparison to fail in each 128-by-128 synthetic
image test and add a marker immediately before its later independent object
check. At baseline 84ce566, both return exit 1 without reaching the marker.
With this patch, both return exit 1 and reach the marker. For this experiment,
baseline entry points were renamed only to reuse the test driver. All mutations
were restored before the final build and normal test run.

                    single-resolution   multiresolution
baseline exit       1                   1
baseline marker     absent              absent
modified exit       1                   1
modified marker     present             present
normal tests        2/2 passed after restoration

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[greptile-apps]

Confidence Score: 5/5

[Low impact] The PR appears safe to merge; no actionable issues were found.

Summary

Updates both VariationalRegistration tests to ITK conventions without changing registration settings or the ten-pixel tolerance.

• Single-resolution registration checks continue after an individual check fails.
• Multi-resolution registration checks continue after an individual check fails.

No actionable issues were found. Tests were not run during this review.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Run image update] --> B{Update succeeds?}
  B -->|Yes| C[Compare pixels]
  B -->|No| D[Record failure and skip pixels]
  C --> E[Keep check result]
  D --> F[Run later checks]
  E --> F
  F --> G[Return accumulated status]

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_{Reviews (1) · Last reviewed commit: "ENH: Improve VariationalRegistration tes..." · Reviewed by Greptile}