AU: Try delta updates first, then full updates

src/platform/update_engine/postinstall_runner_action_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <string>
 #include <vector>
 #include <gtest/gtest.h>
@@ skipping 38 matching lines @@
 
 TEST_F(PostinstallRunnerActionTest, RunAsRootErrScriptTest) {
   ASSERT_EQ(0, getuid());
   DoTest(true, true);
 }
 
 void PostinstallRunnerActionTest::DoTest(bool do_losetup, bool do_err_script) {
   ASSERT_EQ(0, getuid()) << "Run me as root. Ideally don't run other tests "
                          << "as root, tho.";
 
-  const string mountpoint(utils::kStatefulPartition + "/au_destination");
+  const string mountpoint(string(utils::kStatefulPartition) +
+                          "/au_destination");
 
   string cwd;
   {
     vector<char> buf(1000);
     ASSERT_EQ(&buf[0], getcwd(&buf[0], buf.size()));
     cwd = string(&buf[0], strlen(&buf[0]));
   }
 
   // create the au destination, if it doesn't exist
   ASSERT_EQ(0, System(string("mkdir -p ") + mountpoint));
@@ skipping 76 matching lines @@
 
 // Death tests don't seem to be working on Hardy
 TEST_F(PostinstallRunnerActionTest, DISABLED_RunAsRootDeathTest) {
   ASSERT_EQ(0, getuid());
   PostinstallRunnerAction runner_action;
   ASSERT_DEATH({ runner_action.TerminateProcessing(); },
                "postinstall_runner_action.h:.*] Check failed");
 }
 
 }  // namespace chromeos_update_engine