1 files changed, 20 insertions, 0 deletions
diff --git a/dom/streams/test/xpcshell/bug-1503406.js b/dom/streams/test/xpcshell/bug-1503406.js
new file mode 100644
index 0000000000..8e45291faf
--- /dev/null
+++ b/dom/streams/test/xpcshell/bug-1503406.js
@@ -0,0 +1,20 @@
+let read;
+let reader;
+
+add_task(async function test() {
+  let g = newGlobal({ wantGlobalProperties: ["ReadableStream"] });
+  reader = g.eval(`
+    let stream = new ReadableStream({
+        start(controller) {
+            controller.enqueue([]);
+        },
+    });
+    let [b1, b2] = stream.tee();
+    b1.getReader();
+`);
+  read = new ReadableStream({}).getReader().read;
+});
+
+add_task(async function test2() {
+  read.call(reader);
+});