Sprinkle some defensiveness into the UI tests so that they don't explode if t...

chrome/test/page_cycler/page_cycler_test.cc

 // Copyright (c) 2006-2009 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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 191 matching lines @@
 
     // run N iterations
     GURL::Replacements replacements;
     const char query_string[] = "iterations=" TEST_ITERATIONS "&auto=1";
     replacements.SetQuery(
         query_string,
         url_parse::Component(0, arraysize(query_string) - 1));
     test_url = test_url.ReplaceComponents(replacements);
 
     scoped_refptr<TabProxy> tab(GetActiveTab());
+    ASSERT_TRUE(tab.get());
     tab->NavigateToURL(test_url);
 
     // Wait for the test to finish.
     ASSERT_TRUE(WaitUntilCookieValue(tab.get(), test_url, "__pc_done",
                                      3000, UITest::test_timeout_ms(), "1"));
 
     std::string cookie;
     ASSERT_TRUE(tab->GetCookieByName(test_url, "__pc_pages", &cookie));
     pages->assign(UTF8ToWide(cookie));
     ASSERT_FALSE(pages->empty());
@@ skipping 297 matching lines @@
 
 TEST_F(PageCyclerTest, BloatHttp) {
   RunTest("bloat", true);
 }
 
 TEST_F(PageCyclerReferenceTest, BloatHttp) {
   RunTest("bloat", true);
 }
 
 }  // namespace