ENH: Convert 4 Common CTests to GoogleTest

[hjmjohnson]

Mechanical conversion of 4 no-argument CTests in Modules/Core/Common/test/ to GoogleTest format: CompensatedSummation, PriorityQueue, RealTimeInterval, RealTimeStamp.

Conversion details

Old Test	New GTest	TEST() blocks
itkCompensatedSummationTest	itkCompensatedSummationGTest	1 (ConvertedLegacyTest)
itkPriorityQueueTest	itkPriorityQueueGTest	1 (ConvertedLegacyTest)
itkRealTimeIntervalTest	itkRealTimeIntervalGTest	5 (DefaultConstructor, AccumulationAndSubtraction, SetWithNormalization, Addition, ComparisonOperators)
itkRealTimeStampTest	itkRealTimeStampGTest	6 (DefaultConstructor, NegativeIntervalThrows, AccumulationAndSubtraction, IntervalSetWithNormalization, IntervalAddition, ComparisonOperators)

• Every return EXIT_FAILURE path mapped to a corresponding EXPECT_* assertion
• CHECK_FOR_VALUE / CHECK_FOR_BOOLEAN macros replaced with EXPECT_LE / EXPECT_TRUE / EXPECT_FALSE
• ITK_TRY_EXPECT_EXCEPTION replaced with EXPECT_THROW(..., itk::ExceptionObject)
• Rename commits preserve git log --follow history tracking

Local verification

• Build: ITKCommonGTestDriver links successfully (1476 targets)
• Tests: 14/14 passed (1 CompensatedSummation + 1 PriorityQueue + 5 RealTimeInterval + 6 RealTimeStamp + 1 CompensatedSummationTest2 unchanged)
• Pre-commit: clang-format, gersemi, all hooks passed

[dzenanz]

Looks good on a glance.

[greptile-apps]

Greptile Summary

Mechanical conversion of four Modules/Core/Common CTests (CompensatedSummation, PriorityQueue, RealTimeInterval, RealTimeStamp) from legacy int main() style to GoogleTest, with corresponding CMakeLists.txt plumbing updates. All original assertion paths are faithfully preserved: CHECK_FOR_VALUE/CHECK_FOR_BOOLEAN macros become EXPECT_LE/EXPECT_TRUE/EXPECT_FALSE, and ITK_TRY_EXPECT_EXCEPTION becomes EXPECT_THROW(..., itk::ExceptionObject).

Confidence Score: 5/5

Safe to merge — all original test coverage is preserved, logic conversions are correct, and no functional regressions were identified.

All remaining findings are P2 style suggestions (duplicated helper, test-suite name mismatch). No correctness, data-integrity, or reliability issues were found. The assertion mappings are faithful and the CMakeLists.txt plumbing is consistent with the existing GTest driver pattern.

itkRealTimeStampGTest.cxx — ComparisonOperators test exercises RealTimeInterval objects under a RealTimeStamp suite name (inherited issue, not blocking).

Important Files Changed

Filename	Overview
Modules/Core/Common/test/CMakeLists.txt	Removes four legacy CTest source files and their itk_add_test entries; adds four new GTest sources to the GTest driver target. Plumbing is consistent with the rest of the file.
Modules/Core/Common/test/itkCompensatedSummationGTest.cxx	Faithful rename + conversion: EXIT_FAILURE guards replaced by EXPECT_* macros; original two-condition check (`vanillaError <= accumulatorError
Modules/Core/Common/test/itkPriorityQueueGTest.cxx	Faithful rename + conversion; min-queue and max-queue loop invariants preserved; sequence is not mutated by the min-queue pass so the max-queue sequence.back() / sequence.size() checks remain valid.
Modules/Core/Common/test/itkRealTimeIntervalGTest.cxx	New GTest file with 5 well-scoped test cases; all original CHECK_FOR_VALUE / CHECK_FOR_BOOLEAN paths accounted for; minor: identical CheckForValue helper also lives in itkRealTimeStampGTest.cxx.
Modules/Core/Common/test/itkRealTimeStampGTest.cxx	New GTest file with 6 test cases; both ITK_TRY_EXPECT_EXCEPTION sites mapped correctly; ComparisonOperators test is labelled RealTimeStamp but exercises only RealTimeInterval objects (inherited issue, noted as P2).
Modules/Core/Common/test/itkRealTimeIntervalTest.cxx	Deleted — content migrated to itkRealTimeIntervalGTest.cxx; no residual references remain.
Modules/Core/Common/test/itkRealTimeStampTest.cxx	Deleted — content migrated to itkRealTimeStampGTest.cxx; no residual references remain.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    subgraph Before["Before (legacy CTest)"]
        A1[itkCompensatedSummationTest.cxx] --> D1[ITKCommon2TestDriver]
        A2[itkPriorityQueueTest.cxx] --> D2[ITKCommon1TestDriver]
        A3[itkRealTimeIntervalTest.cxx] --> D2
        A4[itkRealTimeStampTest.cxx] --> D2
    end

    subgraph After["After (GoogleTest)"]
        B1[itkCompensatedSummationGTest.cxx] --> G[ITKCommonGTestDriver]
        B2[itkPriorityQueueGTest.cxx] --> G
        B3[itkRealTimeIntervalGTest.cxx] --> G
        B4[itkRealTimeStampGTest.cxx] --> G
    end

    G --> T1[RealTimeInterval: 5 TEST blocks]
    G --> T2[RealTimeStamp: 6 TEST blocks]
    G --> T3[CompensatedSummation: 1 TEST block]
    G --> T4[PriorityQueue: 1 TEST block]

Loading

Comments Outside Diff (2)

1. Modules/Core/Common/test/itkRealTimeStampGTest.cxx, line 731-766 (link)

   Test suite name vs. tested type mismatch

   TEST(RealTimeStamp, ComparisonOperators) only constructs and compares itk::RealTimeInterval objects (t1, t2, t3), so the GoogleTest output will label this as a RealTimeStamp test even though it never exercises any RealTimeStamp comparison operators. This is inherited from the original monolithic test, but the mechanical split into named GTest blocks is a good opportunity to either rename this to TEST(RealTimeInterval, ComparisonOperators) or replace t1/t2/t3 with actual itk::RealTimeStamp objects to match the suite name.

2. Modules/Core/Common/test/itkRealTimeIntervalGTest.cxx, line 304-313 (link)

   Duplicated CheckForValue helper

   The same CheckForValue function (including the ITK_GCC_PRAGMA_PUSH/ITK_GCC_SUPPRESS_Wfloat_equal block) is copy-pasted verbatim into both itkRealTimeIntervalGTest.cxx and itkRealTimeStampGTest.cxx. If the tolerance logic ever needs to change, both files must be updated in sync. Extracting this into a small shared test-utility header (e.g. itkGTestUtilities.h) would keep it DRY. This is a minor concern since anonymous-namespace placement prevents ODR issues, but worth noting for future maintainability.

_{Reviews (1): Last reviewed commit: "ENH: Convert itkRealTimeStampTest to GTe..." | Re-trigger Greptile}