I Built C++ Test Impact Analysis With Zero Runtime Dependencies

说明与用途

diff2test 是一个 CLI 工具，利用 CMake、CTest 和编译器生成的元数据，确定在文件更改后需要运行哪些 CTest 测试，从而在不添加运行时依赖的情况下减少 CI 时间。

问题

Running the full C++ test suite after every change is expensive; need to run only affected tests without adding runtime dependencies.

结果

diff2test reduces test execution time by selecting only impacted tests while remaining zero‑dependency at runtime.

工作流

• Collect changed file paths via git diff or stdin
• Provide a list of compiler .d files via --dep-list
• Read CMake File API JSON for targets and sources
• Read CTest JSON for test definitions
• Build reverse dependency graph from targets to tests
• Propagate impact from changed files to affected tests
• Validate evidence; if missing, exit with FULL_SUITE_SELECTED or FULL_SUITE_REQUIRED
• Output selected test names or exit code 0 for subset

证据

If something important is missing or suspicious, the optimization disappears.

来源

The program would not produce its own evidence. It would consume evidence.

来源

The successful narrow case is: SUBSET_SELECTED exit 0

来源