diff -r 000000000000 -r 6474c204b198 dom/indexedDB/test/unit/test_advance.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/indexedDB/test/unit/test_advance.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,192 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+var testGenerator = testSteps();
+
+function testSteps()
+{
+  const dataCount = 30;
+
+  let request = indexedDB.open(this.window ? window.location.pathname : "Splendid Test", 1);
+  request.onerror = errorHandler;
+  request.onupgradeneeded = grabEventAndContinueHandler;
+  let event = yield undefined;
+
+  let db = event.target.result;
+  db.onerror = errorHandler;
+
+  event.target.onsuccess = continueToNextStep;
+
+  let objectStore = db.createObjectStore("", { keyPath: "key" });
+  objectStore.createIndex("", "index");
+
+  for (let i = 0; i < dataCount; i++) {
+    objectStore.add({ key: i, index: i });
+  }
+  yield undefined;
+
+  function getObjectStore() {
+    return db.transaction("").objectStore("");
+  }
+
+  function getIndex() {
+    return db.transaction("").objectStore("").index("");
+  }
+
+  let count = 0;
+
+  getObjectStore().openCursor().onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      count++;
+      cursor.continue();
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, dataCount, "Saw all data");
+
+  count = 0;
+
+  getObjectStore().openCursor().onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      is(cursor.primaryKey, count, "Got correct object");
+      if (count) {
+        count++;
+        cursor.continue();
+      }
+      else {
+        count = 10;
+        cursor.advance(10);
+      }
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, dataCount, "Saw all data");
+
+  count = 0;
+
+  getIndex().openCursor().onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      is(cursor.primaryKey, count, "Got correct object");
+      if (count) {
+        count++;
+        cursor.continue();
+      }
+      else {
+        count = 10;
+        cursor.advance(10);
+      }
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, dataCount, "Saw all data");
+
+  count = 0;
+
+  getIndex().openKeyCursor().onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      is(cursor.primaryKey, count, "Got correct object");
+      if (count) {
+        count++;
+        cursor.continue();
+      }
+      else {
+        count = 10;
+        cursor.advance(10);
+      }
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, dataCount, "Saw all data");
+
+  count = 0;
+
+  getObjectStore().openCursor().onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      is(cursor.primaryKey, count, "Got correct object");
+      if (count == 0) {
+        cursor.advance(dataCount + 1);
+      }
+      else {
+        ok(false, "Should never get here!");
+        cursor.continue();
+      }
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, 0, "Saw all data");
+
+  count = dataCount - 1;
+
+  getObjectStore().openCursor(null, "prev").onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      is(cursor.primaryKey, count, "Got correct object");
+      count--;
+      if (count == dataCount - 2) {
+        cursor.advance(10);
+        count -= 9;
+      }
+      else {
+        cursor.continue();
+      }
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, -1, "Saw all data");
+
+  count = dataCount - 1;
+
+  getObjectStore().openCursor(null, "prev").onsuccess = function(event) {
+    let cursor = event.target.result;
+    if (cursor) {
+      is(cursor.primaryKey, count, "Got correct object");
+      if (count == dataCount - 1) {
+        cursor.advance(dataCount + 1);
+      }
+      else {
+        ok(false, "Should never get here!");
+        cursor.continue();
+      }
+    }
+    else {
+      continueToNextStep();
+    }
+  };
+  yield undefined;
+
+  is(count, dataCount - 1, "Saw all data");
+
+  finishTest();
+  yield undefined;
+}