1 files changed, 55 insertions, 0 deletions
diff --git a/testing/web-platform/tests/streams/transferable/window.html b/testing/web-platform/tests/streams/transferable/window.html
new file mode 100644
index 0000000000..11c868356b
--- /dev/null
+++ b/testing/web-platform/tests/streams/transferable/window.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/helpers.js"></script>
+<script>
+'use strict';
+
+promise_test(t => {
+  const orig = createOriginalReadableStream();
+  const promise = testMessageEvent(window);
+  postMessage(orig, '*', [orig]);
+  assert_true(orig.locked, 'the original stream should be locked');
+  return promise;
+}, 'window.postMessage should be able to transfer a ReadableStream');
+
+promise_test(t => {
+  const orig = createOriginalReadableStream();
+  const mc = new MessageChannel();
+  const promise = testMessageEvent(mc.port1);
+  mc.port1.start();
+
+  mc.port2.postMessage(orig, [orig]);
+  mc.port2.close();
+  assert_true(orig.locked, 'the original stream should be locked');
+  return promise;
+}, 'port.postMessage should be able to transfer a ReadableStream');
+
+promise_test(t => {
+  const orig = createOriginalReadableStream();
+  const promise = new Promise(resolve => {
+    addEventListener('message', t.step_func(evt => {
+      const [rs1, rs2] = evt.data;
+      assert_equals(rs1, rs2, 'both ReadableStreams should be the same object');
+      resolve();
+    }), {once: true});
+  });
+  postMessage([orig, orig], '*', [orig]);
+  return promise;
+}, 'the same ReadableStream posted multiple times should arrive together');
+
+const onloadPromise = new Promise(resolve => onload = resolve);
+
+promise_test(() => {
+  const orig = createOriginalReadableStream();
+  const promise = testMessageEvent(window);
+  return onloadPromise.then(() => {
+    const echoIframe = document.querySelector('#echo');
+    echoIframe.contentWindow.postMessage(orig, '*', [orig]);
+    return promise;
+  });
+}, 'transfer to and from an iframe should work');
+</script>
+
+<iframe id=echo src="resources/echo-iframe.html" style="display:none"></iframe>