1 files changed, 49 insertions, 0 deletions
diff --git a/toolkit/components/thumbnails/test/browser_thumbnails_bg_no_cookies_sent.js b/toolkit/components/thumbnails/test/browser_thumbnails_bg_no_cookies_sent.js
new file mode 100644
index 0000000000..9558e98223
--- /dev/null
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_bg_no_cookies_sent.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function thumbnails_bg_no_cookies_sent() {
+  // Visit the test page in the browser and tell it to set a cookie.
+  let url = bgTestPageURL({ setGreenCookie: true });
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url,
+    },
+    async browser => {
+      // The root element of the page shouldn't be green yet.
+      await SpecialPowers.spawn(browser, [], function () {
+        Assert.notEqual(
+          content.document.documentElement.style.backgroundColor,
+          "rgb(0, 255, 0)",
+          "The page shouldn't be green yet."
+        );
+      });
+
+      // Cookie should be set now.  Reload the page to verify.  Its root element
+      // will be green if the cookie's set.
+      browser.reload();
+      await BrowserTestUtils.browserLoaded(browser);
+      await SpecialPowers.spawn(browser, [], function () {
+        Assert.equal(
+          content.document.documentElement.style.backgroundColor,
+          "rgb(0, 255, 0)",
+          "The page should be green now."
+        );
+      });
+
+      // Capture the page.  Get the image data of the capture and verify it's not
+      // green.  (Checking only the first pixel suffices.)
+      await bgCapture(url);
+      ok(thumbnailExists(url), "Thumbnail file should exist after capture.");
+
+      let [r, g, b] = await retrieveImageDataForURL(url);
+      isnot(
+        [r, g, b].toString(),
+        [0, 255, 0].toString(),
+        "The captured page should not be green."
+      );
+      removeThumbnail(url);
+    }
+  );
+});