add read_optional_enum_attribute to webidl-tests/enums

crates/webidl-tests/enums.js

@@ -18,4 +18,12 @@ global.Shape = class Shape {
   getShape() {
     return this.kind;
   }
+
+  get shapeTypeNone() {
+    return null;
+  }
+
+  get shapeTypeSome() {
+    return this.kind;
+  }
 };

crates/webidl-tests/enums.rs

@@ -35,3 +35,17 @@ fn invalid_enum_return() {
         _ => {} // Success
     };
 }
+
+#[wasm_bindgen_test]
+fn read_optional_enum_attribute_none() {
+    let shape = Shape::new(ShapeType::Circle).unwrap();
+    let shape_type: Option<ShapeType> = shape.shape_type_none();
+    assert_eq!(shape_type, None);
+}
+
+#[wasm_bindgen_test]
+fn read_optional_enum_attribute_some() {
+    let shape = Shape::new(ShapeType::Circle).unwrap();
+    let shape_type: Option<ShapeType> = shape.shape_type_some();
+    assert_eq!(shape_type, Some(ShapeType::Circle));
+}

crates/webidl-tests/enums.webidl

@@ -12,4 +12,8 @@ interface Shape {
 
   [Pure]
     ShapeType getShape();
+
+  readonly attribute ShapeType? shapeTypeNone;
+
+  readonly attribute ShapeType? shapeTypeSome;
 };