1 files changed, 11 insertions, 0 deletions
diff --git a/testing/mochitest/tests/browser/browser_fail_uncaught_rejection_expected_multi.js b/testing/mochitest/tests/browser/browser_fail_uncaught_rejection_expected_multi.js
new file mode 100644
index 0000000000..cea5a870aa
--- /dev/null
+++ b/testing/mochitest/tests/browser/browser_fail_uncaught_rejection_expected_multi.js
@@ -0,0 +1,11 @@
+setExpectedFailuresForSelfTest(1);
+
+// The test will fail because an expected uncaught rejection is actually caught.
+const { PromiseTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromiseTestUtils.sys.mjs"
+);
+PromiseTestUtils.expectUncaughtRejection(/Promise rejection./);
+
+function test() {
+  Promise.reject(new Error("Promise rejection.")).catch(() => {});
+}