Add differential testing harness #216
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This runs wgsl shaders and rust shaders and compares the output. If the output differs, the test fails. Differential testing is better than snapshot testing or golden file testing as there are no reference files to get outdated. Note that we are only using wgpu for now, but I want to also vary the host-side crate / use `ash`. At least we are using `wgpu`'s vulkan support on linux, so we are not just testing naga's translation.
Without this it waits on the package lock anyway
Looks like this option isn't there anymore?
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I think I'd like eyes on this before I do a clean up in case people have major feedback. |
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Perhaps better DX is to have directories and just |
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The test harness compiles and runs Rust
shaders/kernels and compares the output with those produced by equivalent WGSL
shaders/kernels. Unlike traditional reference, golden, or snapshot tests—which check
against static outputs—differential testing compares two independent implementations.
This approach is more robust because discrepancies between them are more likely to
indicate real bugs rather than issues with outdated reference files.
You can run difftests via
cargo difftest. This is an alias set up in.cargo/configfor
cargo run --release -p difftest --. You can filter to run specific tests bypassing the (partial) filenames to
cargo difftest some_file_name.