1 files changed, 69 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_isSynthetic.js b/toolkit/content/tests/browser/browser_isSynthetic.js
new file mode 100644
index 0000000000..7788d6317e
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_isSynthetic.js
@@ -0,0 +1,69 @@
+function LocationChangeListener(browser) {
+  this.browser = browser;
+  browser.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_LOCATION);
+}
+
+LocationChangeListener.prototype = {
+  wasSynthetic: false,
+  browser: null,
+
+  destroy() {
+    this.browser.removeProgressListener(this);
+  },
+
+  onLocationChange(webProgress, request, location, flags) {
+    this.wasSynthetic = this.browser.isSyntheticDocument;
+  },
+
+  QueryInterface: ChromeUtils.generateQI([
+    "nsIWebProgressListener",
+    "nsISupportsWeakReference",
+  ]),
+};
+
+const FILES = gTestPath
+  .replace("browser_isSynthetic.js", "")
+  .replace("chrome://mochitests/content/", "http://example.com/");
+
+function waitForPageShow(browser) {
+  return BrowserTestUtils.waitForContentEvent(browser, "pageshow", true);
+}
+
+add_task(async function () {
+  let tab = BrowserTestUtils.addTab(gBrowser, "about:blank");
+  let browser = tab.linkedBrowser;
+  await BrowserTestUtils.browserLoaded(browser);
+  let listener = new LocationChangeListener(browser);
+
+  is(browser.isSyntheticDocument, false, "Should not be synthetic");
+
+  let loadPromise = waitForPageShow(browser);
+  BrowserTestUtils.loadURIString(
+    browser,
+    "data:text/html;charset=utf-8,<html/>"
+  );
+  await loadPromise;
+  is(listener.wasSynthetic, false, "Should not be synthetic");
+  is(browser.isSyntheticDocument, false, "Should not be synthetic");
+
+  loadPromise = waitForPageShow(browser);
+  BrowserTestUtils.loadURIString(browser, FILES + "empty.png");
+  await loadPromise;
+  is(listener.wasSynthetic, true, "Should be synthetic");
+  is(browser.isSyntheticDocument, true, "Should be synthetic");
+
+  loadPromise = waitForPageShow(browser);
+  browser.goBack();
+  await loadPromise;
+  is(listener.wasSynthetic, false, "Should not be synthetic");
+  is(browser.isSyntheticDocument, false, "Should not be synthetic");
+
+  loadPromise = waitForPageShow(browser);
+  browser.goForward();
+  await loadPromise;
+  is(listener.wasSynthetic, true, "Should be synthetic");
+  is(browser.isSyntheticDocument, true, "Should be synthetic");
+
+  listener.destroy();
+  gBrowser.removeTab(tab);
+});