Split *_ARGS values using shell-like syntax.

CHANGELOG.md

@@ -8,6 +8,10 @@
 * Added `DocumentOrShadowRoot.adoptedStyleSheets`.
   [#4625](https://github.com/wasm-bindgen/wasm-bindgen/pull/4625)
 
+* Added support for arguments with spaces using shell-style quoting in webdriver `*_ARGS`
+  environment variables to `wasm-bindgen-test`.
+  [#4433](https://github.com/wasm-bindgen/wasm-bindgen/pull/4433)
+
 ### Fixed
 
 * Fixed wrong method names for `GestureEvent` bindings.

crates/cli/Cargo.toml

@@ -30,6 +30,7 @@ rouille = { version = "3.0.0", default-features = false }
 serde = { version = "1.0", features = ['derive'] }
 serde_derive = "1.0"
 serde_json = "1.0"
+shlex = "1"
 tempfile = "3.0"
 ureq = { version = "2.7", default-features = false, features = ["brotli", "gzip"] }
 walrus = "0.23"

crates/cli/src/bin/wasm-bindgen-test-runner/headless.rs

@@ -251,11 +251,10 @@ impl Driver {
     /// extra arguments to the driver's invocation.
     fn find() -> Result<Driver, Error> {
         let env_args = |name: &str| {
-            env::var(format!("{}_ARGS", name.to_uppercase()))
-                .unwrap_or_default()
-                .split_whitespace()
-                .map(|s| s.to_string())
-                .collect::<Vec<_>>()
+            let var = env::var(format!("{}_ARGS", name.to_uppercase())).unwrap_or_default();
+
+            shlex::split(&var)
+                .unwrap_or_else(|| var.split_whitespace().map(|s| s.to_string()).collect())
         };
 
         let drivers = [