diff -r 000000000000 -r 6474c204b198 dom/indexedDB/test/unit/test_readonly_transactions.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/indexedDB/test/unit/test_readonly_transactions.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,181 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+if (!this.window) {
+  this.runTest = function() {
+    todo(false, "Test disabled in xpcshell test suite for now");
+    finishTest();
+  }
+}
+
+var testGenerator = testSteps();
+
+function testSteps()
+{
+  const name = this.window ? window.location.pathname : "Splendid Test";
+  const osName = "foo";
+
+  let request = indexedDB.open(name, 1);
+  request.onerror = errorHandler;
+  request.onupgradeneeded = grabEventAndContinueHandler;
+  request.onsuccess = grabEventAndContinueHandler;
+  let event = yield undefined;
+
+  let db = event.target.result;
+  is(db.objectStoreNames.length, 0, "Correct objectStoreNames list");
+
+  db.createObjectStore(osName, { autoIncrement: "true" });
+
+  yield undefined;
+
+  let key1, key2;
+
+  request = db.transaction([osName], "readwrite")
+              .objectStore(osName)
+              .add({});
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    key1 = event.target.result;
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction(osName, "readwrite").objectStore(osName).add({});
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    key2 = event.target.result;
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction([osName], "readwrite")
+              .objectStore(osName)
+              .put({}, key1);
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction(osName, "readwrite")
+              .objectStore(osName)
+              .put({}, key2);
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction([osName], "readwrite")
+              .objectStore(osName)
+              .put({}, key1);
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction(osName, "readwrite")
+              .objectStore(osName)
+              .put({}, key1);
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction([osName], "readwrite")
+              .objectStore(osName)
+              .delete(key1);
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    testGenerator.next();
+  }
+  yield undefined;
+
+  request = db.transaction(osName, "readwrite")
+              .objectStore(osName)
+              .delete(key2);
+  request.onerror = errorHandler;
+  request.onsuccess = function(event) {
+    is(event.target.transaction.mode, "readwrite", "Correct mode");
+    testGenerator.next();
+  }
+  yield undefined;
+
+  try {
+    request = db.transaction([osName]).objectStore(osName).add({});
+    ok(false, "Adding to a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Adding to a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction(osName).objectStore(osName).add({});
+    ok(false, "Adding to a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Adding to a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction([osName]).objectStore(osName).put({});
+    ok(false, "Adding or modifying a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Adding or modifying a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction(osName).objectStore(osName).put({});
+    ok(false, "Adding or modifying a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Adding or modifying a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction([osName]).objectStore(osName).put({}, key1);
+    ok(false, "Modifying a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Modifying a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction(osName).objectStore(osName).put({}, key1);
+    ok(false, "Modifying a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Modifying a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction([osName]).objectStore(osName).delete(key1);
+    ok(false, "Removing from a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Removing from a readonly transaction failed");
+  }
+
+  try {
+    request = db.transaction(osName).objectStore(osName).delete(key2);
+    ok(false, "Removing from a readonly transaction should fail!");
+  }
+  catch (e) {
+    ok(true, "Removing from a readonly transaction failed");
+  }
+
+  finishTest();
+  yield undefined;
+}