1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onPop-async-01.js b/js/src/jit-test/tests/debug/Frame-onPop-async-01.js
new file mode 100644
index 0000000000..8d491f3f7f
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onPop-async-01.js
@@ -0,0 +1,39 @@
+// When an async function awaits, if Frame.onPop processes microtasks,
+// the async function itself will not run. It'll run later.
+//
+// This is a reentrancy test, like Frame-onPop-generators-03.
+
+let g = newGlobal({newCompartment: true});
+g.log = "";
+g.eval(`
+  async function f() {
+    log += "1";
+    debugger;
+    log += "2";
+    await Promise.resolve(3);
+    log += "3";
+    return "ok";
+  }
+`);
+
+let dbg = Debugger(g);
+dbg.onDebuggerStatement = frame => {
+  frame.onPop = completion => {
+    // What we are really testing is that when onPop is called, we have not
+    // yet thrown this async function activation back into the hopper.
+    g.log += 'A';
+    drainJobQueue();
+    g.log += 'B';
+
+    frame.onPop = completion => {
+      g.log += 'C';
+    };
+  };
+};
+
+let status = "FAIL - g.f() did not resolve";
+g.f().then(value => { status = value; });
+assertEq(g.log, "12AB");
+drainJobQueue();
+assertEq(g.log, "12AB3C");
+assertEq(status, "ok");