1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/promise/promise-race-with-default-resolving-internal.js b/js/src/jit-test/tests/promise/promise-race-with-default-resolving-internal.js
new file mode 100644
index 0000000000..815124c46f
--- /dev/null
+++ b/js/src/jit-test/tests/promise/promise-race-with-default-resolving-internal.js
@@ -0,0 +1,54 @@
+function newPromiseCapability() {
+    let resolve, reject, promise = new Promise(function(r1, r2) {
+        resolve = r1;
+        reject = r2;
+    });
+    return {promise, resolve, reject};
+}
+
+function neverCalled() {
+    // Quit with non-zero exit code to ensure a test suite error is shown,
+    // even when this function is called within promise handlers which normally
+    // swallow any exceptions.
+    quit(1);
+}
+
+var c = 0;
+var g_resolve;
+
+class P extends Promise {
+    constructor(executor) {
+        // Only the very first object created through this constructor gets
+        // special treatment, all other invocations create built-in Promise
+        // objects.
+        if (c++ > 1) {
+            return new Promise(executor);
+        }
+
+        // Pass a native ResolvePromiseFunction function as the resolve handler.
+        // (It's okay that the promise of this promise capability is never used.)
+        executor(newPromiseCapability().resolve, neverCalled);
+
+        let {promise, resolve} = newPromiseCapability();
+        g_resolve = resolve;
+
+        // Use an async function to create a Promise without resolving functions.
+        return async function(){ await promise; return 456; }();
+    }
+
+    // Ensure we don't take the (spec) fast path in Promise.resolve and instead
+    // create a new promise object. (We could not provide an override at all
+    // and rely on the default behaviour, but giving an explicit definition
+    // may help to interpret this test case.)
+    static resolve(v) {
+        return super.resolve(v);
+    }
+}
+
+let {promise: alwaysPending} = newPromiseCapability();
+
+P.race([alwaysPending]).then(neverCalled, neverCalled);
+
+g_resolve(123);
+
+drainJobQueue();