1 files changed, 29 insertions, 0 deletions
diff --git a/dom/streams/test/xpcshell/dom_stream_prototype_test.js b/dom/streams/test/xpcshell/dom_stream_prototype_test.js
new file mode 100644
index 0000000000..b127368318
--- /dev/null
+++ b/dom/streams/test/xpcshell/dom_stream_prototype_test.js
@@ -0,0 +1,29 @@
+"use strict";
+
+var log = [];
+const stream = new ReadableStream({
+  start(controller) {
+    log.push("started");
+  },
+  pull(controller) {
+    log.push("pulled");
+    controller.enqueue("hi from pull");
+  },
+  cancel() {
+    log.push("cancelled");
+  },
+});
+
+print(log); // Currently prints "started"!
+
+add_task(async function helper() {
+  var reader = stream.getReader();
+  var readPromise = reader.read();
+  readPromise.then(x => print(`Printing promise result ${x}, log ${log}`));
+  print(log);
+
+  var x = await readPromise;
+  print(`Promise result ${x} ${x.value}`);
+  Assert.equal(x.value, "hi from pull");
+  Assert.ok(true);
+});