Bug 1526700 [wpt PR 15267] - Add screen orientation test: fire event before promise is resolved, a=testonly

Automatic update from web-platform-tests Add screen orientation test: fire event before promise is resolved (#15267) -- wpt-commits: 8ed64687560332642c7b34ebd16011ae5b01d99a wpt-pr: 15267
2019-02-19 14:39:38 +00:00 · 2019-02-19 14:39:38 +00:00 · 8fa076c265
--- a/testing/web-platform/tests/screen-orientation/event-before-promise.html
+++ b/testing/web-platform/tests/screen-orientation/event-before-promise.html
@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  promise_test(async t => {
+    await test_driver.bless("request full screen", () => {
+      return document.documentElement.requestFullscreen();
+    });
+
+    const promiseToChange = new Promise(resolve => {
+      screen.orientation.addEventListener("change", resolve);
+    });
+
+    const result = await Promise.race([
+      screen.orientation.lock("landscape"),
+      promiseToChange
+    ]);
+
+    assert_true(result instanceof Event, "Expected an instance of Event");
+  }, "The 'change' event must fire before the [[orientationPendingPromise]] is resolved.");
+</script>