1 files changed, 87 insertions, 0 deletions
diff --git a/image/test/browser/browser_bug1869938.js b/image/test/browser/browser_bug1869938.js
new file mode 100644
index 0000000000..39956d8601
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+++ b/image/test/browser/browser_bug1869938.js
@@ -0,0 +1,87 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This test opens a private browsing window, then opens a content page in it
+ * that sets a favicon that is a data uri containing a svg file, which
+ * contains an image element that refers to a data uri containing a png image.
+ * This tests that we don't hit an assert when loading the png in the favicon
+ * in the parent process with this setup.
+ */
+
+function waitForLinkAvailable(browser, win) {
+  let resolve, reject;
+
+  let listener = {
+    onLinkIconAvailable(b, dataURI, iconURI) {
+      // Ignore icons for other browsers or empty icons.
+      if (browser !== b || !iconURI) {
+        return;
+      }
+
+      win.gBrowser.removeTabsProgressListener(listener);
+      resolve(iconURI);
+    },
+  };
+
+  let promise = new Promise((res, rej) => {
+    resolve = res;
+    reject = rej;
+
+    win.gBrowser.addTabsProgressListener(listener);
+  });
+
+  promise.cancel = () => {
+    win.gBrowser.removeTabsProgressListener(listener);
+
+    reject();
+  };
+
+  return promise;
+}
+
+add_task(async function test() {
+  function httpURL(filename) {
+    let chromeURL = getRootDirectory(gTestPath) + filename;
+    return chromeURL.replace(
+      "chrome://mochitests/content/",
+      "http://mochi.test:8888/"
+    );
+  }
+
+  let win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+
+  const pageUrl = httpURL("helper1869938.html");
+
+  let tab = (win.gBrowser.selectedTab = BrowserTestUtils.addTab(
+    win.gBrowser,
+    "about:blank"
+  ));
+
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  let faviconPromise = waitForLinkAvailable(tab.linkedBrowser, win);
+
+  BrowserTestUtils.startLoadingURIString(tab.linkedBrowser, pageUrl);
+
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  await new Promise(resolve => {
+    waitForFocus(resolve, win);
+  });
+
+  await faviconPromise;
+
+  // do a couple rafs here to ensure its loaded and displayed
+  await new Promise(r => requestAnimationFrame(r));
+  await new Promise(r => requestAnimationFrame(r));
+
+  await BrowserTestUtils.closeWindow(win);
+
+  win = null;
+  tab = null;
+  faviconPromise = null;
+
+  ok(true, "we got here and didn't crash/assert");
+});