1 files changed, 62 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_animation_emitMutations.js b/devtools/server/tests/browser/browser_animation_emitMutations.js
new file mode 100644
index 000000000..4783a8209
--- /dev/null
+++ b/devtools/server/tests/browser/browser_animation_emitMutations.js
@@ -0,0 +1,62 @@
+/* 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";
+
+// Test that the AnimationsActor emits events about changed animations on a
+// node after getAnimationPlayersForNode was called on that node.
+
+add_task(function* () {
+  let {client, walker, animations} =
+    yield initAnimationsFrontForUrl(MAIN_DOMAIN + "animation.html");
+
+  info("Retrieve a non-animated node");
+  let node = yield walker.querySelector(walker.rootNode, ".not-animated");
+
+  info("Retrieve the animation player for the node");
+  let players = yield animations.getAnimationPlayersForNode(node);
+  is(players.length, 0, "The node has no animation players");
+
+  info("Listen for new animations");
+  let onMutations = once(animations, "mutations");
+
+  info("Add a couple of animation on the node");
+  yield node.modifyAttributes([
+    {attributeName: "class", newValue: "multiple-animations"}
+  ]);
+  let changes = yield onMutations;
+
+  ok(true, "The mutations event was emitted");
+  is(changes.length, 2, "There are 2 changes in the mutation event");
+  ok(changes.every(({type}) => type === "added"), "Both changes are additions");
+
+  let names = changes.map(c => c.player.initialState.name).sort();
+  is(names[0], "glow", "The animation 'glow' was added");
+  is(names[1], "move", "The animation 'move' was added");
+
+  info("Store the 2 new players for comparing later");
+  let p1 = changes[0].player;
+  let p2 = changes[1].player;
+
+  info("Listen for removed animations");
+  onMutations = once(animations, "mutations");
+
+  info("Remove the animation css class on the node");
+  yield node.modifyAttributes([
+    {attributeName: "class", newValue: "not-animated"}
+  ]);
+
+  changes = yield onMutations;
+
+  ok(true, "The mutations event was emitted");
+  is(changes.length, 2, "There are 2 changes in the mutation event");
+  ok(changes.every(({type}) => type === "removed"), "Both are removals");
+  ok(changes[0].player === p1 || changes[0].player === p2,
+    "The first removed player was one of the previously added players");
+  ok(changes[1].player === p1 || changes[1].player === p2,
+    "The second removed player was one of the previously added players");
+
+  yield client.close();
+  gBrowser.removeCurrentTab();
+});