1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Object-getPromiseReactions-05.js b/js/src/jit-test/tests/debug/Object-getPromiseReactions-05.js
new file mode 100644
index 0000000000..89fc1fe70b
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Object-getPromiseReactions-05.js
@@ -0,0 +1,48 @@
+// Debugger.Object.prototype.getPromiseReactions reports reaction records
+// created by `await` expressions in async generators.
+
+const g = newGlobal({ newCompartment: true });
+const dbg = new Debugger;
+const DOg = dbg.addDebuggee(g);
+
+g.eval(`
+    var pResolve, pReject;
+    var p0 = new Promise((resolve, reject) => { pResolve = resolve; pReject = reject });
+
+    // In this case, promiseReactions encounters a Debugger.Frame we had already
+    // associated with the generator, when we hit the debugger statement.
+    async function* f1() { debugger; await p0; }
+
+    // In this case, promiseReactions must construct the Debugger.Frame itself,
+    // since it is the first to encounter the generator.
+    async function* f2() { await p0; debugger; }
+`);
+
+let DFf1, DFf2;
+dbg.onDebuggerStatement = (frame) => {
+  DFf1 = frame;
+  dbg.onDebuggerStatement = (frame) => {
+    DFf2 = frame;
+    dbg.onDebuggerStatement = () => { throw "Shouldn't fire twice"; };
+  };
+};
+
+g.eval(`var p1 = f1().next();`);
+assertEq(DFf1.callee.name, "f1");
+
+g.eval(`var p2 = f2().next();`);
+assertEq(DFf2, undefined);
+
+const [DOp0, DOp1, DOp2] =
+      [g.p0, g.p1, g.p2].map(p => DOg.makeDebuggeeValue(p));
+
+const reactions = DOp0.getPromiseReactions();
+assertEq(reactions.length, 2);
+assertEq(reactions[0], DFf1);
+assertEq(true, reactions[1] instanceof Debugger.Frame);
+
+// Let f2 run until it hits its debugger statement.
+g.pResolve(42);
+drainJobQueue();
+assertEq(DFf2.terminated, true);
+assertEq(reactions[1], DFf2);