AviSynthPlus-UT

External C++17 unit tests for selected AviSynthPlus internal video and audio kernels, plus selected public video filter classes. The upstream project is pinned as a Git submodule; the test build never modifies it. Minimal production fixes discovered by the tests are kept as separate upstream changes.

The suite targets internal video and public audio kernels, then directly constructed public video filters with a real AviSynth environment and synthetic input clips. Tests emphasize independent behavioral checks, deterministic output, scalar/SIMD equivalence, active-pixel hashing, input immutability, row padding, and allocation guards without modifying the upstream source.

Build and run

git submodule update --init --recursive
cmake --preset gcc-debug
cmake --build --preset gcc-debug
ctest --preset gcc-debug

Use clang19-debug or clang22-debug for Clang, or gcc-sanitize for ASan plus UBSan. Use gcc-coverage to build the GCC gcov instrumentation profile used by the hosted source-coverage report.

The upstream AvsCore static library is built in a separate ExternalProject build tree and linked as a normal imported target. The sanitizer preset applies to the test executable and support code; the external upstream build remains a separately configured dependency.

On Windows, use the MSVC x64 preset from a Visual Studio 2026 Developer PowerShell:

git submodule update --init --recursive
cmake --preset msvc-debug
cmake --build --preset msvc-debug
ctest --preset msvc-debug

The Visual Studio 2026 generator requires a CMake version that supports it (CMake 4.2 or newer).

Windows/MSVC is part of the supported test matrix. On pushes to master and manual dispatches, GitHub Actions builds the gcc-coverage profile, runs CTest, and publishes the latest test result plus full Linux/GCC-compiled AvsCore coverage report to GitHub Pages. Enable GitHub Pages with the GitHub Actions source in repository settings before the first deployment.

The coverage profile links a reporting-only inventory executable against every object in the upstream static library. This records zero-count files as well as executed files, so the report represents the full set of Linux/GCC-compiled AvsCore sources. It does not include platform-specific sources that the Linux upstream build does not compile.

Layout

• tests/support: C++17 RAII buffers, typed plane views, deterministic data, comparison, hashing, CPU features, variant helpers, and reusable support for direct public-filter tests.
• tests/turn: Video-kernel unit tests and scalar/SIMD comparison cases.
• tests/convolution: Direct public-filter tests using a real environment and synthetic clips.
• cmake/UpstreamTargets.cmake: isolated full-AvsCore upstream build and imported target.
• third_party/AviSynthPlus: official pinned submodule.

Original files in this repository are MIT licensed. AviSynthPlus, GoogleTest, and xxHash retain their respective upstream licenses. Compiled test binaries are local/CI intermediates and are not published project artifacts.