1 files changed, 32 insertions, 0 deletions
diff --git a/toolkit/components/thumbnails/test/browser_thumbnails_bg_redirect.js b/toolkit/components/thumbnails/test/browser_thumbnails_bg_redirect.js
new file mode 100644
index 0000000000..ae0096ff18
--- /dev/null
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_bg_redirect.js
@@ -0,0 +1,32 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function thumbnails_bg_redirect() {
+  let finalURL = "https://example.com/redirected";
+  let originalURL = bgTestPageURL({ redirect: finalURL });
+
+  ok(
+    !thumbnailExists(originalURL),
+    "Thumbnail file for original URL should not exist yet."
+  );
+  ok(
+    !thumbnailExists(finalURL),
+    "Thumbnail file for final URL should not exist yet."
+  );
+
+  let captureOriginalPromise = bgAddPageThumbObserver(originalURL);
+  let captureFinalPromise = bgAddPageThumbObserver(finalURL);
+
+  let [capturedURL] = await bgCapture(originalURL);
+  is(capturedURL, originalURL, "Captured URL should be URL passed to capture");
+  await captureOriginalPromise;
+  await captureFinalPromise;
+  ok(
+    thumbnailExists(originalURL),
+    "Thumbnail for original URL should be cached"
+  );
+  ok(thumbnailExists(finalURL), "Thumbnail for final URL should be cached");
+
+  removeThumbnail(originalURL);
+  removeThumbnail(finalURL);
+});