1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/animationinspector/test/browser_animation_timeline_shows_name_label.js b/devtools/client/animationinspector/test/browser_animation_timeline_shows_name_label.js
new file mode 100644
index 000000000..e5778c943
--- /dev/null
+++ b/devtools/client/animationinspector/test/browser_animation_timeline_shows_name_label.js
@@ -0,0 +1,46 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+requestLongerTimeout(2);
+
+// Check the text content and width of name label.
+
+add_task(function* () {
+  yield addTab(URL_ROOT + "doc_simple_animation.html");
+  let {inspector, panel} = yield openAnimationInspector();
+
+  info("Selecting 'simple-animation' animation which is running on compositor");
+  yield selectNodeAndWaitForAnimations(".animated", inspector);
+  checkNameLabel(panel.animationsTimelineComponent.rootWrapperEl, "simple-animation");
+
+  info("Selecting 'no-compositor' animation which is not running on compositor");
+  yield selectNodeAndWaitForAnimations(".no-compositor", inspector);
+  checkNameLabel(panel.animationsTimelineComponent.rootWrapperEl, "no-compositor");
+});
+
+function checkNameLabel(rootWrapperEl, expectedLabelContent) {
+  const timeblockEl = rootWrapperEl.querySelector(".time-block");
+  const labelEl = rootWrapperEl.querySelector(".name div");
+  is(labelEl.textContent, expectedLabelContent,
+     `Text content of labelEl sould be ${ expectedLabelContent }`);
+
+  // Expand timeblockEl to avoid max-width of the label.
+  timeblockEl.style.width = "10000px";
+  const originalLabelWidth = labelEl.clientWidth;
+  ok(originalLabelWidth < timeblockEl.clientWidth / 2,
+     "Label width should be less than 50%");
+
+  // Set timeblockEl width to double of original label width.
+  timeblockEl.style.width = `${ originalLabelWidth * 2 }px`;
+  is(labelEl.clientWidth + labelEl.offsetLeft, originalLabelWidth,
+     `Label width + offsetLeft should be ${ originalLabelWidth }px`);
+
+  // Shrink timeblockEl to enable max-width.
+  timeblockEl.style.width = `${ originalLabelWidth }px`;
+  is(labelEl.clientWidth + labelEl.offsetLeft,
+     Math.round(timeblockEl.clientWidth / 2),
+     "Label width + offsetLeft should be half of timeblockEl");
+}