1 files changed, 51 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_animation_setPlaybackRate.js b/devtools/server/tests/browser/browser_animation_setPlaybackRate.js
new file mode 100644
index 000000000..b6d41b51e
--- /dev/null
+++ b/devtools/server/tests/browser/browser_animation_setPlaybackRate.js
@@ -0,0 +1,51 @@
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check that a player's playbackRate can be changed, and that multiple players
+// can have their rates changed at the same time.
+
+add_task(function* () {
+  let {client, walker, animations} =
+    yield initAnimationsFrontForUrl(MAIN_DOMAIN + "animation.html");
+
+  info("Retrieve an animated node");
+  let node = yield walker.querySelector(walker.rootNode, ".simple-animation");
+
+  info("Retrieve the animation player for the node");
+  let [player] = yield animations.getAnimationPlayersForNode(node);
+
+  ok(player.setPlaybackRate, "Player has the setPlaybackRate method");
+
+  info("Change the rate to 10");
+  yield player.setPlaybackRate(10);
+
+  info("Query the state again");
+  let state = yield player.getCurrentState();
+  is(state.playbackRate, 10, "The playbackRate was updated");
+
+  info("Change the rate back to 1");
+  yield player.setPlaybackRate(1);
+
+  info("Query the state again");
+  state = yield player.getCurrentState();
+  is(state.playbackRate, 1, "The playbackRate was changed back");
+
+  info("Retrieve several animation players and set their rates");
+  node = yield walker.querySelector(walker.rootNode, "body");
+  let players = yield animations.getAnimationPlayersForNode(node);
+
+  info("Change all animations in <body> to .5 rate");
+  yield animations.setPlaybackRates(players, .5);
+
+  info("Query their states and check they are correct");
+  for (let player of players) {
+    let state = yield player.getCurrentState();
+    is(state.playbackRate, .5, "The playbackRate was updated");
+  }
+
+  yield client.close();
+  gBrowser.removeCurrentTab();
+});