1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/stream/reader-closedPromise-handled.js b/js/src/jit-test/tests/stream/reader-closedPromise-handled.js
new file mode 100644
index 0000000000..b17a8dda4d
--- /dev/null
+++ b/js/src/jit-test/tests/stream/reader-closedPromise-handled.js
@@ -0,0 +1,24 @@
+// |jit-test| skip-if: !this.hasOwnProperty("ReadableStream")
+// Creating a reader from an errored stream should not result in a promise
+// being tracked as unhandled.
+
+// Create an errored stream.
+let stream = new ReadableStream({
+  start(controller) {
+    controller.error(new Error("splines insufficiently reticulated"));
+  }
+});
+drainJobQueue();
+
+// Track promises.
+let status = new Map;
+setPromiseRejectionTrackerCallback((p, x) => { status.set(p, x); });
+
+// Per Streams spec 3.7.4 step 5.c, this creates a rejected promise
+// (reader.closed) but marks it as handled.
+let reader = stream.getReader();
+
+// Check that the promise's status is not 0 (unhandled);
+// it may be either 1 (handled) or undefined (never tracked).
+let result = status.get(reader.closed);
+assertEq(result === 1 || result === undefined, true);