1 files changed, 65 insertions, 0 deletions
diff --git a/dom/html/test/head.js b/dom/html/test/head.js
new file mode 100644
index 0000000000..1e3b435d0c
--- /dev/null
+++ b/dom/html/test/head.js
@@ -0,0 +1,65 @@
+function pushPrefs(...aPrefs) {
+  return SpecialPowers.pushPrefEnv({ set: aPrefs });
+}
+
+function promiseWaitForEvent(
+  object,
+  eventName,
+  capturing = false,
+  chrome = false
+) {
+  return new Promise(resolve => {
+    function listener(event) {
+      info("Saw " + eventName);
+      object.removeEventListener(eventName, listener, capturing, chrome);
+      resolve(event);
+    }
+
+    info("Waiting for " + eventName);
+    object.addEventListener(eventName, listener, capturing, chrome);
+  });
+}
+
+/**
+ * Waits for the next load to complete in any browser or the given browser.
+ * If a <tabbrowser> is given it waits for a load in any of its browsers.
+ *
+ * @return promise
+ */
+function waitForDocLoadComplete(aBrowser = gBrowser) {
+  return new Promise(resolve => {
+    let listener = {
+      onStateChange(webProgress, req, flags, status) {
+        let docStop =
+          Ci.nsIWebProgressListener.STATE_IS_NETWORK |
+          Ci.nsIWebProgressListener.STATE_STOP;
+        info(
+          "Saw state " +
+            flags.toString(16) +
+            " and status " +
+            status.toString(16)
+        );
+        // When a load needs to be retargetted to a new process it is cancelled
+        // with NS_BINDING_ABORTED so ignore that case
+        if ((flags & docStop) == docStop && status != Cr.NS_BINDING_ABORTED) {
+          aBrowser.removeProgressListener(this);
+          waitForDocLoadComplete.listeners.delete(this);
+          let chan = req.QueryInterface(Ci.nsIChannel);
+          info("Browser loaded " + chan.originalURI.spec);
+          resolve();
+        }
+      },
+      QueryInterface: ChromeUtils.generateQI([
+        "nsIWebProgressListener",
+        "nsISupportsWeakReference",
+      ]),
+    };
+    aBrowser.addProgressListener(listener);
+    waitForDocLoadComplete.listeners.add(listener);
+    info("Waiting for browser load");
+  });
+}
+// Keep a set of progress listeners for waitForDocLoadComplete() to make sure
+// they're not GC'ed before we saw the page load.
+waitForDocLoadComplete.listeners = new Set();
+registerCleanupFunction(() => waitForDocLoadComplete.listeners.clear());