1 files changed, 50 insertions, 0 deletions
diff --git a/browser/base/content/test/favicons/browser_favicon_cache.js b/browser/base/content/test/favicons/browser_favicon_cache.js
new file mode 100644
index 0000000000..903f038d6c
--- /dev/null
+++ b/browser/base/content/test/favicons/browser_favicon_cache.js
@@ -0,0 +1,50 @@
+add_task(async () => {
+  const testPath =
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.com/browser/browser/base/content/test/favicons/cookie_favicon.html";
+  const resetPath =
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.com/browser/browser/base/content/test/favicons/cookie_favicon.sjs?reset";
+
+  let tab = BrowserTestUtils.addTab(gBrowser, testPath);
+  gBrowser.selectedTab = tab;
+  let browser = tab.linkedBrowser;
+
+  let faviconPromise = waitForLinkAvailable(browser);
+  await BrowserTestUtils.browserLoaded(browser);
+  await faviconPromise;
+  let cookies = Services.cookies.getCookiesFromHost(
+    "example.com",
+    browser.contentPrincipal.originAttributes
+  );
+  let seenCookie = false;
+  for (let cookie of cookies) {
+    if (cookie.name == "faviconCookie") {
+      seenCookie = true;
+      is(cookie.value, "1", "Should have seen the right initial cookie.");
+    }
+  }
+  ok(seenCookie, "Should have seen the cookie.");
+
+  faviconPromise = waitForLinkAvailable(browser);
+  BrowserTestUtils.loadURIString(browser, testPath);
+  await BrowserTestUtils.browserLoaded(browser);
+  await faviconPromise;
+  cookies = Services.cookies.getCookiesFromHost(
+    "example.com",
+    browser.contentPrincipal.originAttributes
+  );
+  seenCookie = false;
+  for (let cookie of cookies) {
+    if (cookie.name == "faviconCookie") {
+      seenCookie = true;
+      is(cookie.value, "1", "Should have seen the cached cookie.");
+    }
+  }
+  ok(seenCookie, "Should have seen the cookie.");
+
+  // Reset the cookie so if this test is run again it will still pass.
+  await fetch(resetPath);
+
+  BrowserTestUtils.removeTab(tab);
+});