Add a test

crates/webidl-tests/simple.js

@@ -87,6 +87,12 @@ global.Unforgeable = class Unforgeable {
   }
 };
 
+global.GlobalMethod = class GlobalMethod {
+  constructor() {
+    this.m = () => 123;
+  }
+};
+
 global.PartialInterface = class PartialInterface {
   get un() {
     return 1;

crates/webidl-tests/simple.rs

@@ -62,6 +62,12 @@ fn optional_method() {
     assert!(f.opt(None) == None);
 }
 
+#[wasm_bindgen_test]
+fn global_method() {
+    let f = GlobalMethod::new().unwrap();
+    assert!(f.m() == 123);
+}
+
 #[wasm_bindgen_test]
 fn unforgeable_is_structural() {
     let f = Unforgeable::new().unwrap();

crates/webidl-tests/simple.webidl

@@ -35,6 +35,11 @@ interface OptionalMethod {
   octet? opt(short? a);
 };
 
+[Global=GlobalMethod, Constructor()]
+interface GlobalMethod {
+  octet m();
+};
+
 [Constructor()]
 interface Unforgeable {
   [Unforgeable] readonly attribute short uno;