Testing - The `wasm-bindgen` Guide

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# Running `wasm-bindgen`'s Tests

## Wasm Tests on Node and Headless Browsers

These are the largest test suites, and most common to run in day to day `wasm-bindgen` development. These tests are compiled to Wasm and then run in Node.js or a headless browser via the WebDriver protocol.

    WASM_BINDGEN_SPLIT_LINKED_MODULES=1 cargo test --target wasm32-unknown-unknown

See the `wasm-bindgen-test` crate's `README.md` for details and configuring which headless browser is used.

## Sanity Tests for `wasm-bindgen` on the Native Host Target

This small test suite just verifies that exported `wasm-bindgen` methods can still be used on the native host's target.

    cargo test

## The Web IDL Frontend's Tests

    cargo test -p webidl-tests --target wasm32-unknown-unknown

## The Macro UI Tests

These tests assert that we have reasonable error messages that point to the right source spans when the `#[wasm_bindgen]` proc-macro is misused.

You can run these tests by running `cargo test` for the `wasm-bindgen-macro` crate:

    cargo test -p wasm-bindgen-macro

## The `js-sys` Tests

See the `js-sys` testing page.

## The `web-sys` Tests

See the `web-sys` testing page.