Test for AsRef implementations

Part of #670

crates/js-sys/tests/wasm/Array.rs

@@ -306,4 +306,5 @@ fn array_inheritance() {
     let array = Array::new();
     assert!(array.is_instance_of::<Array>());
     assert!(array.is_instance_of::<Object>());
+    let _: &Object = array.as_ref();
 }

crates/js-sys/tests/wasm/ArrayBuffer.rs

@@ -41,4 +41,5 @@ fn arraybuffer_inheritance() {
     let buf = ArrayBuffer::new(4);
     assert!(buf.is_instance_of::<ArrayBuffer>());
     assert!(buf.is_instance_of::<Object>());
+    let _: &Object = buf.as_ref();
 }

crates/js-sys/tests/wasm/Boolean.rs

@@ -18,4 +18,5 @@ fn boolean_inheritance() {
     let b = Boolean::new(&JsValue::from(true));
     assert!(b.is_instance_of::<Boolean>());
     assert!(b.is_instance_of::<Object>());
+    let _: &Object = b.as_ref();
 }

crates/js-sys/tests/wasm/DataView.rs

@@ -50,4 +50,6 @@ fn dataview_inheritance() {
 
     assert!(v.is_instance_of::<DataView>());
     assert!(v.is_instance_of::<Object>());
+
+    let _: &Object = v.as_ref();
 }

crates/js-sys/tests/wasm/Date.rs

@@ -413,4 +413,5 @@ fn date_inheritance() {
     let date = Date::new(&"August 19, 1975 23:15:30".into());
     assert!(date.is_instance_of::<Date>());
     assert!(date.is_instance_of::<Object>());
+    let _: &Object = date.as_ref();
 }

crates/js-sys/tests/wasm/Error.rs

@@ -42,4 +42,5 @@ fn error_inheritance() {
     let error = Error::new("test");
     assert!(error.is_instance_of::<Error>());
     assert!(error.is_instance_of::<Object>());
+    let _: &Object = error.as_ref();
 }

crates/js-sys/tests/wasm/EvalError.rs

@@ -52,4 +52,6 @@ fn evalerror_inheritance() {
     assert!(error.is_instance_of::<EvalError>());
     assert!(error.is_instance_of::<Error>());
     assert!(error.is_instance_of::<Object>());
+    let _: &Error = error.as_ref();
+    let _: &Object = error.as_ref();
 }

crates/js-sys/tests/wasm/Function.rs

@@ -66,4 +66,5 @@ fn to_string() {
 fn function_inheritance() {
     assert!(MAX.is_instance_of::<Function>());
     assert!(MAX.is_instance_of::<Object>());
+    let _: &Object = MAX.as_ref();
 }

crates/js-sys/tests/wasm/Map.rs

@@ -93,4 +93,5 @@ fn map_inheritance() {
     let map = Map::new();
     assert!(map.is_instance_of::<Map>());
     assert!(map.is_instance_of::<Object>());
+    let _: &Object = map.as_ref();
 }

crates/js-sys/tests/wasm/Number.rs

@@ -111,4 +111,5 @@ fn number_inheritance() {
     let n = Number::new(&JsValue::from(42));
     assert!(n.is_instance_of::<Number>());
     assert!(n.is_instance_of::<Object>());
+    let _: &Object = n.as_ref();
 }

crates/js-sys/tests/wasm/RegExp.rs

@@ -7,6 +7,7 @@ fn regexp_inheritance() {
     let re = RegExp::new(".", "");
     assert!(re.is_instance_of::<RegExp>());
     assert!(re.is_instance_of::<Object>());
+    let _: &Object = re.as_ref();
 }
 
 #[wasm_bindgen_test]

crates/js-sys/tests/wasm/Set.rs

@@ -87,4 +87,5 @@ fn set_inheritance() {
     let set = Set::new(&JsValue::undefined());
     assert!(set.is_instance_of::<Set>());
     assert!(set.is_instance_of::<Object>());
+    let _: &Object = set.as_ref();
 }

crates/js-sys/tests/wasm/WeakMap.rs

@@ -57,4 +57,5 @@ fn weakmap_inheritance() {
     let map = WeakMap::new();
     assert!(map.is_instance_of::<WeakMap>());
     assert!(map.is_instance_of::<Object>());
+    let _: &Object = map.as_ref();
 }

crates/js-sys/tests/wasm/WeakSet.rs

@@ -47,4 +47,5 @@ fn weakset_inheritance() {
     let set = WeakSet::new();
     assert!(set.is_instance_of::<WeakSet>());
     assert!(set.is_instance_of::<Object>());
+    let _: &Object = set.as_ref();
 }