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-rw-r--r--browser/base/content/test/general/browser_bug585785.js48
1 files changed, 48 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_bug585785.js b/browser/base/content/test/general/browser_bug585785.js
new file mode 100644
index 0000000000..094f132086
--- /dev/null
+++ b/browser/base/content/test/general/browser_bug585785.js
@@ -0,0 +1,48 @@
+var tab;
+
+function test() {
+ waitForExplicitFinish();
+
+ // Force-enable tab animations
+ gReduceMotionOverride = false;
+
+ tab = BrowserTestUtils.addTab(gBrowser);
+ isnot(
+ tab.getAttribute("fadein"),
+ "true",
+ "newly opened tab is yet to fade in"
+ );
+
+ // Try to remove the tab right before the opening animation's first frame
+ window.requestAnimationFrame(checkAnimationState);
+}
+
+function checkAnimationState() {
+ is(tab.getAttribute("fadein"), "true", "tab opening animation initiated");
+
+ info(window.getComputedStyle(tab).maxWidth);
+ gBrowser.removeTab(tab, { animate: true });
+ if (!tab.parentNode) {
+ ok(
+ true,
+ "tab removed synchronously since the opening animation hasn't moved yet"
+ );
+ finish();
+ return;
+ }
+
+ info(
+ "tab didn't close immediately, so the tab opening animation must have started moving"
+ );
+ info("waiting for the tab to close asynchronously");
+ tab.addEventListener(
+ "TabAnimationEnd",
+ function listener() {
+ executeSoon(function() {
+ ok(!tab.parentNode, "tab removed asynchronously");
+ finish();
+ });
+ },
+ { once: true }
+ );
+}