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This commit adds support to the `wasm-bindgen-test-runner` binary to perform headless testing via browsers. The previous commit introduced a local server to serve up files and run tests in a browser, and this commit adds support for executing that in an automated fashion. The general idea here is that each browser has a binary that implements the WebDriver specification. These binaries (typically `foodriver` for the browser "Foo") are interfaced with using HTTP and JSON messages. The implementation was simple enough and the crates.io support was lacking enough that a small implementation of the WebDriver protocol was added directly to this crate. Currently Firefox (`geckodriver`), Chrome (`chromedriver`), and Safari (`safaridriver`) are supported for running tests. The test harness will recognize env vars like `GECKODRIVER=foo` to specifically use one or otherwise detects the first driver in `PATH`. Eventually we may wish to automatically download a driver if one isn't found, but that isn't implemented yet. Headless testing is turned on with the `CI=1` env var currently to be amenable with things like Travis and AppVeyor, but this may wish to grow an explicit option to run headless tests in the future.
wasm-bindgen
Facilitating high-level interactions between wasm modules and JavaScript.
Introduction blog post: "JavaScript to Rust and Back Again: A wasm-bindgen Tale"
Import JavaScript things into Rust and export Rust things to JavaScript.
src/lib.rs:
#![feature(use_extern_macros)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
// Import the `window.alert` function from the Web.
#[wasm_bindgen]
extern {
fn alert(s: &str);
}
// Export a `greet` function from Rust to JavaScript, that alerts a
// hello message.
#[wasm_bindgen]
pub fn greet(name: &str) {
alert(&format!("Hello, {}!", name));
}
Use exported Rust things from JavaScript!
index.js:
// Asynchronously load, compile, and import the Rust's WebAssembly
// and JavaScript interface.
import("./hello_world").then(module => {
// Alert "Hello, World!"
module.greet("World!");
});
Guide
📚 Read the wasm-bindgen guide here! 📚
License
This project is licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Contribution
See the "Contributing" section of the guide for information on
hacking on wasm-bindgen!
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.