Randy Reddig (Mar 12 2024 at 16:58): Randy Reddig (Mar 12 2024 at 16:58):As part of my work with Go bindings generation, I’d like to have a reliable way to test component implementations.
I’d like to have a Test component and an Implementation component where the Test component imports an interface exported by the Implementation component. Is there a process for combining the two components into a single component that, say, Wasmtime can run?
The Test component would use a world that combines wasi:cli/command + another world to test. The Implementation component would export the latter.
fitzgen (he/him) (Mar 12 2024 at 17:01):There is the wasm-tools compose subcommand of the wasm-tools CLI: https://github.com/bytecodealliance/wasm-tools
Or there is the Rust crate that does the same things as a library: https://crates.io/crates/wasm-compose
fitzgen (he/him) (Mar 12 2024 at 17:02):looks like the crate's README is a bit outdated
fitzgen (he/him) (Mar 12 2024 at 17:02):in the bit about implementation status
fitzgen (he/him) (Mar 12 2024 at 17:03):https://github.com/bytecodealliance/wasm-tools/pull/1447
Alex Crichton (Mar 12 2024 at 17:07):I'll also drop a link to https://github.com/peterhuene/wac which is intended for compositions as well and is sort of the "next generation" of wasm-tools compose, although it's still in development so it may not be suitable for all use cases yet
Randy Reddig (Mar 12 2024 at 17:07):OK, thanks!
Alex Crichton (Mar 12 2024 at 17:08):I'll also mention that the testing story in wit-bindgen is one I've always lamented is "not great". It's pretty heavyweight today and is one that I would love to improve, and what you're describing is a way I've wanted to try implementing before.
Alex Crichton (Mar 12 2024 at 17:08):tl;dr; I like your idea, and if it works out I'd like to change wit-bindgen to a similar scheme
Alex Crichton (Mar 12 2024 at 17:08):ideally one day I'd hope that there could be sort of a shared test suite for all bindings generators to easily use
Randy Reddig (Mar 12 2024 at 17:53):That’d be great.
Randy Reddig (Mar 12 2024 at 17:55):something like a straightforward invocation of a standard tool to compose a wasi:cli/command + another component + with a --test-world $WORLD
Last updated: Dec 23 2024 at 13:07 UTC