Publish a `wasm-bindgen-test` for use as an internal detail within `wasm-pack test`

[fitzgen]

As discussed in today's WG meeting, we are aiming for publishing an initial release of the wasm-bindgen-test crate to be used as an unstable implementation detail within a wasm-pack test command for the Rust 2018 Release Candidate milestone. That's 6 weeks from now: 2018-09-13.

What needs to be done before we publish wasm-bindgen-test for use by wasm-pack test?

+cc @alexcrichton @ashleygwilliams

[fitzgen]

And here is the wasm-pack half: rustwasm/wasm-pack#248

[gnzlbg]

So I followed the steps here https://github.com/rustwasm/wasm-bindgen/blob/master/crates/test/README.md

And got the following error: https://gist.github.com/gnzlbg/bce2a1020dde236e28d466311e4697c8

  = note: rust-lld: error: duplicate symbol: __wbindgen_global_argument_ptr
          >>> defined in /wasm-test/target/wasm32-unknown-unknown/debug/deps/libwasm_bindgen-93b4abe9cd9b46f4.rlib(wasm_bindgen-93b4abe9cd9b46f4.wasm_bindgen13.rcgu.o)
          >>> defined in /wasm-test/target/wasm32-unknown-unknown/debug/deps/libwasm_bindgen-1267805b2935233b.rlib(wasm_bindgen-1267805b2935233b.wasm_bindgen4.rcgu.o)
          
          rust-lld: error: duplicate symbol: __wbindgen_malloc
          >>> defined in /wasm-test/target/wasm32-unknown-unknown/debug/deps/libwasm_bindgen-93b4abe9cd9b46f4.rlib(wasm_bindgen-93b4abe9cd9b46f4.wasm_bindgen13.rcgu.o)
          >>> defined in /wasm-test/target/wasm32-unknown-unknown/debug/deps/libwasm_bindgen-1267805b2935233b.rlib(wasm_bindgen-1267805b2935233b.wasm_bindgen4.rcgu.o)
          
          rust-lld: error: duplicate symbol: __wbindgen_free
          >>> defined in /wasm-test/target/wasm32-unknown-unknown/debug/deps/libwasm_bindgen-93b4abe9cd9b46f4.rlib(wasm_bindgen-93b4abe9cd9b46f4.wasm_bindgen13.rcgu.o)
          >>> defined in /wasm-test/target/wasm32-unknown-unknown/debug/deps/libwasm_bindgen-1267805b2935233b.rlib(wasm_bindgen-1267805b2935233b.wasm_bindgen4.rcgu.o)

System is MacOSX 10.13.6
I installed node via homebrew: brew install node, which installed the version 10.8.0

My Cargo.toml looks like:

[package]
name = "wasm-test"
version = "0.1.0"
authors = ["..."]

[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
wasm-bindgen-test = { git = 'https://github.com/rustwasm/wasm-bindgen' }

and in my wasm-test binary crate, I have a .cargo/config that looks like:

[target.wasm32-unknown-unknown]
runner = 'wasm-bindgen-test-runner'

My src/lib.rs is just an #![no_std] (nothing else), and the tests/test.rs is the one in the Readme.

[alexcrichton]

Looks like @gnzlbg's issue was #667, thanks for the PR!

[gnzlbg]

Yes, @fitzgen was very helpful on IRC, thanks!

[gnzlbg]

could we do a wasm-bindgen minor release to avoid using this from git ?

[fitzgen]

Yes, hopefully today or tomorrow.

[fitzgen]

0.2.16 is published!

[fitzgen]

I think we can close this issue -- I didn't realize that we had already published wasm-bindgen-test when I filed this issue. I think all the remaining work is needed in wasm-pack and in documentation.