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Add mutation testing harness

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Port the scratch-copy mutation runner used by libakerror and libakstdlib, covering libakgl source files with sampling, thresholds, JUnit reports, and test timeouts. Add a CMake target and documentation, preserve the intentionally failing character test exclusion, and migrate the sprite test to the renderer backend so mutation baselines are green.

Co-authored-by: Codex (GPT-5) <noreply@openai.com>
Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>
This commit is contained in:
Tachikoma
2026-07-29 18:42:09 -04:00
parent 6d8c382184
commit b80d38d069
5 changed files with 509 additions and 6 deletions
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22
CMakeLists.txt
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@@ -132,7 +132,7 @@ add_test(NAME semver_unit COMMAND test_semver_unit)
set_tests_properties(
actor bitmasks character registry sprite staticstring tilemap util semver_unit
PROPERTIES WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/tests"
PROPERTIES WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/tests" TIMEOUT 30
)
# Specify include directories for the library's headers (if applicable)
@@ -163,6 +163,26 @@ target_link_libraries(test_util PRIVATE akstdlib::akstdlib akerror::akerror akgl
target_link_libraries(charviewer PRIVATE akstdlib::akstdlib akerror::akerror akgl SDL3::SDL3 SDL3_ttf::SDL3_ttf SDL3_image::SDL3_image SDL3_mixer::SDL3_mixer jansson::jansson -lm)
# Mutation testing copies the repository to scratch space, applies one small
# source change at a time, and verifies that the passing tests detect it. The
# intentionally failing character test is excluded by the harness.
find_package(Python3 COMPONENTS Interpreter)
if(Python3_FOUND)
if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
set(AKGL_MUTATION_TARGET mutation)
else()
set(AKGL_MUTATION_TARGET akgl_mutation)
endif()
add_custom_target(${AKGL_MUTATION_TARGET}
COMMAND ${Python3_EXECUTABLE}
${CMAKE_CURRENT_SOURCE_DIR}/scripts/mutation_test.py
--source-root ${CMAKE_CURRENT_SOURCE_DIR}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
USES_TERMINAL
COMMENT "Running mutation tests (breaks a scratch copy, expects tests to fail)"
)
endif()
set(main_lib_dest "lib/akgl-${MY_LIBRARY_VERSION}")
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/akgl.pc DESTINATION "lib/pkgconfig/")
install(TARGETS akgl DESTINATION "lib/")