1 files changed, 27 insertions, 0 deletions
diff --git a/xpcom/tests/unit/test_bug1434856.js b/xpcom/tests/unit/test_bug1434856.js
new file mode 100644
index 0000000000..a8dfa08079
--- /dev/null
+++ b/xpcom/tests/unit/test_bug1434856.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/  */
+
+function run_test() {
+  let complete = false;
+
+  let runnable = {
+    internalQI: ChromeUtils.generateQI(["nsIRunnable"]),
+    // eslint-disable-next-line mozilla/use-chromeutils-generateqi
+    QueryInterface(iid) {
+      // Attempt to schedule another runnable.  This simulates a GC/CC
+      // being scheduled while executing the JS QI.
+      Services.tm.dispatchToMainThread(() => false);
+      return this.internalQI(iid);
+    },
+
+    run() {
+      complete = true;
+    },
+  };
+
+  Services.tm.dispatchToMainThread(runnable);
+  Services.tm.spinEventLoopUntil(
+    "Test(test_bug1434856.js:run_test)",
+    () => complete
+  );
+}