1 files changed, 66 insertions, 0 deletions
diff --git a/devtools/server/tests/browser/browser_animation_updatedState.js b/devtools/server/tests/browser/browser_animation_updatedState.js
new file mode 100644
index 0000000000..4b1420de52
--- /dev/null
+++ b/devtools/server/tests/browser/browser_animation_updatedState.js
@@ -0,0 +1,66 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+
+"use strict";
+
+// Check the animation player's updated state
+
+add_task(async function () {
+  const { target, walker, animations } = await initAnimationsFrontForUrl(
+    MAIN_DOMAIN + "animation.html"
+  );
+
+  await playStateIsUpdatedDynamically(walker, animations);
+
+  await target.destroy();
+  gBrowser.removeCurrentTab();
+});
+
+async function playStateIsUpdatedDynamically(walker, animations) {
+  info("Getting the test node (which runs a very long animation)");
+  // The animation lasts for 100s, to avoid intermittents.
+  const node = await walker.querySelector(walker.rootNode, ".long-animation");
+
+  info("Getting the animation player front for this node");
+  const [player] = await animations.getAnimationPlayersForNode(node);
+
+  let state = await player.getCurrentState();
+  is(
+    state.playState,
+    "running",
+    "The playState is running while the animation is running"
+  );
+
+  info(
+    "Change the animation's currentTime to be near the end and wait for " +
+      "it to finish"
+  );
+  const onFinished = waitForAnimationPlayState(player, "finished");
+  // Set the currentTime to 98s, knowing that the animation lasts for 100s.
+  await animations.setCurrentTimes([player], 98 * 1000, false);
+  state = await onFinished;
+  is(
+    state.playState,
+    "finished",
+    "The animation has ended and the state has been updated"
+  );
+  Assert.greater(
+    state.currentTime,
+    player.initialState.currentTime,
+    "The currentTime has been updated"
+  );
+}
+
+async function waitForAnimationPlayState(player, playState) {
+  let state = {};
+  while (state.playState !== playState) {
+    state = await player.getCurrentState();
+    await wait(500);
+  }
+  return state;
+}
+
+function wait(ms) {
+  return new Promise(r => setTimeout(r, ms));
+}