1 files changed, 11 insertions, 0 deletions
diff --git a/vendor/js-sys/tests/wasm/Promise.rs b/vendor/js-sys/tests/wasm/Promise.rs
new file mode 100644
index 000000000..5502a6156
--- /dev/null
+++ b/vendor/js-sys/tests/wasm/Promise.rs
@@ -0,0 +1,11 @@
+use js_sys::*;
+use wasm_bindgen::JsCast;
+use wasm_bindgen_test::*;
+
+#[wasm_bindgen_test]
+fn promise_inheritance() {
+    let promise = Promise::new(&mut |_, _| ());
+    assert!(promise.is_instance_of::<Promise>());
+    assert!(promise.is_instance_of::<Object>());
+    let _: &Object = promise.as_ref();
+}