Clear disk cache when the cache is not initialized

net/http/http_cache_unittest.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 "net/http/http_cache.h"
 
 #include "base/hash_tables.h"
 #include "base/message_loop.h"
 #include "base/scoped_vector.h"
 #include "base/string_util.h"
+#include "net/base/cache_type.h"
 #include "net/base/net_errors.h"
 #include "net/base/load_flags.h"
 #include "net/base/load_log_unittest.h"
 #include "net/base/ssl_cert_request_info.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/http/http_byte_range.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_response_info.h"
 #include "net/http/http_transaction.h"
@@ skipping 430 matching lines @@
   explicit MockHttpCache(disk_cache::Backend* disk_cache)
       : http_cache_(new MockNetworkLayer(), disk_cache) {
   }
 
   net::HttpCache* http_cache() { return &http_cache_; }
 
   MockNetworkLayer* network_layer() {
     return static_cast<MockNetworkLayer*>(http_cache_.network_layer());
   }
   MockDiskCache* disk_cache() {
-    return static_cast<MockDiskCache*>(http_cache_.disk_cache());
+    return static_cast<MockDiskCache*>(http_cache_.GetBackend());
   }
 
  private:
   net::HttpCache http_cache_;
 };
 
 
 //-----------------------------------------------------------------------------
 // helpers
 
@@ skipping 289 matching lines @@
 
 TEST(HttpCache, CreateThenDestroy) {
   MockHttpCache cache;
 
   scoped_ptr<net::HttpTransaction> trans;
   int rv = cache.http_cache()->CreateTransaction(&trans);
   EXPECT_EQ(net::OK, rv);
   ASSERT_TRUE(trans.get());
 }
 
+TEST(HttpCache, GetBackend) {
+  // This will initialize a cache object with NULL backend.
+  MockHttpCache cache(NULL);
+
+  // This will lazily initialize the backend.
+  cache.http_cache()->set_type(net::MEMORY_CACHE);
+  EXPECT_TRUE(cache.http_cache()->GetBackend());
+}
+
 TEST(HttpCache, SimpleGET) {
   MockHttpCache cache;
 
   // write to the cache
   RunTransactionTest(cache.http_cache(), kSimpleGET_Transaction);
 
   EXPECT_EQ(1, cache.network_layer()->transaction_count());
   EXPECT_EQ(0, cache.disk_cache()->open_count());
   EXPECT_EQ(1, cache.disk_cache()->create_count());
 }
@@ skipping 2710 matching lines @@
   std::string headers;
   response.headers->GetNormalizedHeaders(&headers);
 
   EXPECT_EQ("HTTP/1.1 200 OK\n"
             "Date: Wed, 22 Jul 2009 03:15:26 GMT\n"
             "Last-Modified: Wed, 06 Feb 2008 22:38:21 GMT\n",
             headers);
 
   RemoveMockTransaction(&mock_network_response);
 }