1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/non262/ReadableStream/basic-pull.js b/js/src/tests/non262/ReadableStream/basic-pull.js
new file mode 100644
index 0000000000..760937c67a
--- /dev/null
+++ b/js/src/tests/non262/ReadableStream/basic-pull.js
@@ -0,0 +1,37 @@
+// |reftest| skip-if(!this.ReadableStream||!this.drainJobQueue)
+
+if ("ignoreUnhandledRejections" in this) {
+  ignoreUnhandledRejections();
+}
+
+// Example of a stream that produces data on demand, the "pull" model.
+let fibStream = new ReadableStream({
+    start(controller) {
+        this.a = 0;
+        this.b = 1;
+        controller.enqueue(0);
+        controller.enqueue(1);
+    },
+
+    pull(controller) {
+        [this.a, this.b] = [this.b, this.a + this.b];
+        controller.enqueue(this.b);
+    }
+});
+
+async function test() {
+    assertEq(fibStream.locked, false);
+    let reader = fibStream.getReader();
+    assertEq(fibStream.locked, true);
+
+    let results = [];
+    while (results.length < 10) {
+        results.push((await reader.read()).value);
+    }
+
+    assertEq(results.join(), "0,1,1,2,3,5,8,13,21,34");
+    reader.releaseLock();
+    assertEq(fibStream.locked, false);
+}
+
+runAsyncTest(test);