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Add comprehensive testing summary documentation
Co-authored-by: ManuelLerchner <[email protected]>
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‎TESTING_SUMMARY.md‎

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# Unit Testing Implementation Summary
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## Overview
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Successfully implemented comprehensive unit testing infrastructure for the ProliferatingCellCollectives C++ codebase using Google Test framework with code coverage reporting and GitHub Actions CI/CD integration.
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## What Was Accomplished
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### 1. Test Infrastructure Setup ✅
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- **Google Test Integration**: Added Google Test 1.14.0 via CMake FetchContent
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- **Build System**: Modified CMakeLists.txt to create a shared library for testing and a separate test executable
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- **PETSc Integration**: Updated CMake to preferentially use system PETSc packages, falling back to download if needed
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- **Coverage Support**: Added optional `-DENABLE_COVERAGE=ON` flag for code coverage analysis using gcov/lcov
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### 2. Comprehensive Test Suite (76 Tests) ✅
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#### ArrayMath Tests (26 tests)
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- Addition, subtraction, multiplication operations
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- Scalar multiplication and negation
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- Cross product and dot product
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- Vector magnitude and distance calculations
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- Normalization and infinity norm
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- Operator overloading verification
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- Support for different array sizes (2D, 3D, 4D)
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#### Quaternion Tests (16 tests)
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- Quaternion multiplication (including non-commutativity)
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- Euler angle to quaternion conversion
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- Vector rotation operations
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- Direction vector calculation
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- Quaternion composition
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- Magnitude preservation verification
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- Identity and basic quaternion operations
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#### SpherocylinderCell/DCPQuery Tests (14 tests)
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- Parallel segment distance calculations
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- Perpendicular segment intersections
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- Degenerate segment handling (point segments)
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- 2D and 3D segment-segment distances
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- Robust computation variant testing
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- Closest point calculations
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- Parameter validation (0-1 range)
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#### Particle Tests (20 tests)
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- Constructor validation (basic and from ParticleData)
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- Getter/setter operations (position, GID, ldot, impedance, stress)
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- Volume calculations (spherocylinder and sphere cases)
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- Age management (increment, reset)
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- Constraint tracking
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- Gravitational force calculations
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- Quaternion normalization verification
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- Force, torque, and velocity accessors
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### 3. Code Coverage Infrastructure ✅
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- **gcov Integration**: Compiler instrumentation for coverage data collection
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- **lcov Reports**: HTML coverage report generation
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- **Filtering**: Excludes system headers, test files, and dependencies from coverage
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- **CI Integration**: Coverage data collected and reported in GitHub Actions
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### 4. GitHub Actions CI/CD ✅
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Created `.github/workflows/test.yml` with:
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- **Triggers**: Runs on push/PR to main, develop, and copilot branches
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- **Dependency Installation**: Automated setup of all required packages
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- **Build & Test**: Compiles with coverage and runs all tests
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- **Coverage Reporting**: Generates HTML reports and uploads as artifacts
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- **PR Comments**: Automatically comments coverage statistics on pull requests
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- **Artifact Storage**: Retains coverage reports for 30 days
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### 5. Documentation ✅
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Created comprehensive test documentation:
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- **tests/README.md**: Complete guide for building, running, and adding tests
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- **Build Instructions**: Step-by-step commands with prerequisites
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- **Coverage Guide**: How to generate and view coverage reports
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- **Test Guidelines**: Best practices for writing new tests
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- **CI/CD Documentation**: Workflow explanation and configuration
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### 6. Configuration Updates ✅
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- **Updated .gitignore**: Excludes build artifacts, coverage data, and reports
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- **CMake Improvements**: Better library/executable separation for testability
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- **System Dependencies**: Leverages system packages where available
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## Test Results
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```
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[==========] Running 76 tests from 4 test suites.
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[----------] 14 tests from DCPQueryTest (0 ms total)
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[----------] 16 tests from QuaternionTest (0 ms total)
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[----------] 20 tests from ParticleTest (0 ms total)
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[----------] 26 tests from ArrayMathTest (0 ms total)
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[==========] 76 tests from 4 test suites ran. (0 ms total)
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[ PASSED ] 76 tests.
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```
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**All tests pass successfully!** ✅
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## File Changes
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### New Files Created
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1. `code/cpp/tests/CMakeLists.txt` - Test build configuration
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2. `code/cpp/tests/test_array_math.cpp` - ArrayMath unit tests
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3. `code/cpp/tests/test_quaternion.cpp` - Quaternion unit tests
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4. `code/cpp/tests/test_spherocylinder.cpp` - Geometry unit tests
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5. `code/cpp/tests/test_particle.cpp` - Particle unit tests
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6. `code/cpp/tests/README.md` - Test documentation
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7. `.github/workflows/test.yml` - CI/CD workflow
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8. `TESTING_SUMMARY.md` - This summary document
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### Modified Files
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1. `code/cpp/CMakeLists.txt` - Added Google Test and test subdirectory
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2. `code/cpp/src/CMakeLists.txt` - Created library for testing
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3. `code/cpp/cmake/modules/petsc.cmake` - System PETSc support
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4. `.gitignore` - Added test artifacts exclusions
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## Quick Start
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```bash
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# Build and run tests
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cd code/cpp
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mkdir -p build && cd build
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cmake ..
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make -j$(nproc) unit_tests
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./tests/unit_tests
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# Build with coverage
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cmake -DENABLE_COVERAGE=ON ..
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make -j$(nproc) unit_tests
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./tests/unit_tests
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# Generate coverage report
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lcov --capture --directory . --output-file coverage.info --ignore-errors mismatch
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lcov --remove coverage.info '/usr/*' '*/build/_deps/*' '*/tests/*' \
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--output-file coverage_filtered.info --ignore-errors unused
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genhtml coverage_filtered.info --output-directory coverage_report
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```
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## CI/CD Workflow
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Every push or pull request triggers:
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1. Automated dependency installation
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2. CMake configuration with coverage enabled
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3. Compilation of test suite
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4. Execution of all 76 tests
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5. Coverage report generation
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6. Artifact upload (30-day retention)
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7. PR comment with coverage statistics
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## Future Enhancements
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Potential areas for expansion:
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- Integration tests for the full simulation pipeline
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- Performance benchmarks for critical functions
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- Additional unit tests for solver classes (BBPGD, etc.)
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- Memory leak detection with Valgrind
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- Static analysis integration (clang-tidy, cppcheck)
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- Mutation testing for test quality verification
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## Conclusion
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The project now has a robust testing infrastructure with:
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- ✅ 76 comprehensive unit tests covering core functionality
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- ✅ Automated CI/CD with GitHub Actions
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- ✅ Code coverage reporting
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- ✅ Comprehensive documentation
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- ✅ Easy-to-use build system
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All tests pass successfully, providing confidence in the correctness of the utility classes, quaternion operations, geometric calculations, and particle physics implementation.

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