1 files changed, 72 insertions, 0 deletions
diff --git a/browser/base/content/test/favicons/browser_favicon_empty_data.js b/browser/base/content/test/favicons/browser_favicon_empty_data.js
new file mode 100644
index 0000000000..5fb8b9b654
--- /dev/null
+++ b/browser/base/content/test/favicons/browser_favicon_empty_data.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_ROOT =
+  "http://mochi.test:8888/browser/browser/base/content/test/favicons/";
+
+const PAGE_URL = TEST_ROOT + "blank.html";
+const ICON_URL = TEST_ROOT + "file_bug970276_favicon1.ico";
+const ICON_DATAURI_START = "data:image/x-icon;base64,AAABAAEAEBAAAAAAAABoBQAA";
+
+const EMPTY_PAGE_URL = TEST_ROOT + "file_favicon_empty.html";
+const EMPTY_ICON_URL = "data:image/x-icon";
+
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: PAGE_URL },
+    async browser => {
+      let iconBox = gBrowser
+        .getTabForBrowser(browser)
+        .querySelector(".tab-icon-image");
+      await addContentLinkForIconUrl(ICON_URL, browser);
+      Assert.ok(
+        browser.mIconURL.startsWith(ICON_DATAURI_START),
+        "Favicon is correctly set."
+      );
+
+      // Give some time to ensure the icon is rendered.
+      /* eslint-disable mozilla/no-arbitrary-setTimeout */
+      await new Promise(resolve => setTimeout(resolve, 200));
+      let firstIconShotDataURL = TestUtils.screenshotArea(iconBox, window);
+
+      let browserLoaded = BrowserTestUtils.browserLoaded(
+        browser,
+        false,
+        EMPTY_PAGE_URL
+      );
+      BrowserTestUtils.startLoadingURIString(browser, EMPTY_PAGE_URL);
+      let iconChanged = waitForFavicon(browser, EMPTY_ICON_URL);
+      await Promise.all([browserLoaded, iconChanged]);
+      Assert.equal(browser.mIconURL, EMPTY_ICON_URL, "Favicon was changed.");
+
+      // Give some time to ensure the icon is rendered.
+      /* eslint-disable mozilla/no-arbitrary-setTimeout */
+      await new Promise(resolve => setTimeout(resolve, 200));
+      let secondIconShotDataURL = TestUtils.screenshotArea(iconBox, window);
+
+      Assert.notEqual(
+        firstIconShotDataURL,
+        secondIconShotDataURL,
+        "Check the first icon didn't persist as the second one is invalid"
+      );
+    }
+  );
+});
+
+async function addContentLinkForIconUrl(url, browser) {
+  let iconChanged = waitForFavicon(browser, url);
+  info("Adding <link> to: " + url);
+  await ContentTask.spawn(browser, url, href => {
+    let doc = content.document;
+    let head = doc.head;
+    let link = doc.createElement("link");
+    link.rel = "icon";
+    link.href = href;
+    link.type = "image/png";
+    head.appendChild(link);
+  });
+  info("Awaiting icon change event for:" + url);
+  await iconChanged;
+}