1 files changed, 38 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_animation_reconstructState.js b/devtools/server/tests/browser/browser_animation_reconstructState.js
new file mode 100644
index 000000000..cd3007b86
--- /dev/null
+++ b/devtools/server/tests/browser/browser_animation_reconstructState.js
@@ -0,0 +1,38 @@
+/* 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, even though the AnimationPlayerActor only sends the bits of its
+// state that change, the front reconstructs the whole state everytime.
+
+add_task(function* () {
+  let {client, walker, animations} =
+    yield initAnimationsFrontForUrl(MAIN_DOMAIN + "animation.html");
+
+  yield playerHasCompleteStateAtAllTimes(walker, animations);
+
+  yield client.close();
+  gBrowser.removeCurrentTab();
+});
+
+function* playerHasCompleteStateAtAllTimes(walker, animations) {
+  let node = yield walker.querySelector(walker.rootNode, ".simple-animation");
+  let [player] = yield animations.getAnimationPlayersForNode(node);
+  yield player.ready();
+
+  // Get the list of state key names from the initialstate.
+  let keys = Object.keys(player.initialState);
+
+  // Get the state over and over again and check that the object returned
+  // contains all keys.
+  // Normally, only the currentTime will have changed in between 2 calls.
+  for (let i = 0; i < 10; i++) {
+    yield player.refreshState();
+    keys.forEach(key => {
+      ok(typeof player.state[key] !== "undefined",
+         "The state retrieved has key " + key);
+    });
+  }
+}