1 files changed, 29 insertions, 0 deletions
diff --git a/devtools/client/inspector/animation/test/browser_animation_logic_mutations_add_remove_immediately.js b/devtools/client/inspector/animation/test/browser_animation_logic_mutations_add_remove_immediately.js
new file mode 100644
index 0000000000..c57f3c7b3b
--- /dev/null
+++ b/devtools/client/inspector/animation/test/browser_animation_logic_mutations_add_remove_immediately.js
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test whether the animation inspector will not crash when add animation then remove
+// immediately.
+
+add_task(async function () {
+  const tab = await addTab(
+    URL_ROOT + "doc_mutations_add_remove_immediately.html"
+  );
+  const { inspector, panel } = await openAnimationInspector();
+
+  info("Check state of the animation inspector after fast mutations");
+  const onDispatch = waitForDispatch(inspector.store, "UPDATE_ANIMATIONS");
+  await startMutation(tab);
+  await onDispatch;
+  ok(
+    panel.querySelector(".animation-error-message"),
+    "No animations message should display"
+  );
+});
+
+async function startMutation(tab) {
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    await content.wrappedJSObject.startMutation();
+  });
+}