1 files changed, 64 insertions, 0 deletions
diff --git a/devtools/client/inspector/animation/test/browser_animation_keyframes-progress-bar_after-resuming.js b/devtools/client/inspector/animation/test/browser_animation_keyframes-progress-bar_after-resuming.js
new file mode 100644
index 0000000000..8b91026799
--- /dev/null
+++ b/devtools/client/inspector/animation/test/browser_animation_keyframes-progress-bar_after-resuming.js
@@ -0,0 +1,64 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test whether keyframes progress bar moves correctly after resuming the animation.
+
+add_task(async function () {
+  await addTab(URL_ROOT + "doc_simple_animation.html");
+  await removeAnimatedElementsExcept([".animated"]);
+  const { animationInspector, panel } = await openAnimationInspector();
+
+  const scrubberPositions = [0, 0.25, 0.5, 0.75];
+  const expectedPositions = [0, 0.25, 0.5, 0.75];
+
+  info("Check whether the keyframes progress bar position was correct");
+  await assertPosition(
+    panel,
+    scrubberPositions,
+    expectedPositions,
+    animationInspector
+  );
+
+  info(
+    "Check whether the keyframes progress bar position was correct " +
+      "after a bit time passed and resuming"
+  );
+  await wait(500);
+  clickOnPauseResumeButton(animationInspector, panel);
+  await assertPosition(
+    panel,
+    scrubberPositions,
+    expectedPositions,
+    animationInspector
+  );
+});
+
+async function assertPosition(
+  panel,
+  scrubberPositions,
+  expectedPositions,
+  animationInspector
+) {
+  const areaEl = panel.querySelector(".keyframes-progress-bar-area");
+  const barEl = areaEl.querySelector(".keyframes-progress-bar");
+  const controllerBounds = areaEl.getBoundingClientRect();
+
+  for (let i = 0; i < scrubberPositions.length; i++) {
+    info(`Scrubber position is ${scrubberPositions[i]}`);
+    clickOnCurrentTimeScrubberController(
+      animationInspector,
+      panel,
+      scrubberPositions[i]
+    );
+    await waitUntilAnimationsPlayState(animationInspector, "paused");
+    const barBounds = barEl.getBoundingClientRect();
+    const barX = barBounds.x + barBounds.width / 2 - controllerBounds.x;
+    const expected = controllerBounds.width * expectedPositions[i];
+    ok(
+      expected - 1 < barX && barX < expected + 1,
+      `Position should apploximately be ${expected} (x of bar is ${barX})`
+    );
+  }
+}