Add WASM_BINDGEN_WEBDRIVER_JSON var to override webdriver.json path

Author: UebelAndre

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

@@ -126,16 +126,17 @@ pub fn run(
         session: None,
     };
     println!("Try find `webdriver.json` for configure browser's capabilities:");
-    let capabilities: Capabilities = match File::open("webdriver.json") {
-        Ok(file) => {
-            println!("Ok");
-            serde_json::from_reader(file)
-        }
-        Err(_) => {
-            println!("Not found");
-            Ok(Capabilities::new())
-        }
-    }?;
+    let capabilities: Capabilities =
+        match File::open(std::env::var("WASM_BINDGEN_WEBDRIVER_JSON").unwrap_or("webdriver.json".to_string())) {
+            Ok(file) => {
+                println!("Ok");
+                serde_json::from_reader(file)
+            }
+            Err(_) => {
+                println!("Not found");
+                Ok(Capabilities::new())
+            }
+        }?;
     shell.status("Starting new webdriver session...");
     // Allocate a new session with the webdriver protocol, and once we've done
     // so schedule the browser to get closed with a call to `close_window`.