Simple Cache: stop running index file tests on Windows

net/disk_cache/simple/simple_index_file_unittest.cc

 // Copyright (c) 2011 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/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/hash.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/pickle.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "net/base/cache_type.h"
 #include "net/disk_cache/simple/simple_entry_format.h"
 #include "net/disk_cache/simple/simple_index.h"
 #include "net/disk_cache/simple/simple_index_file.h"
 #include "net/disk_cache/simple/simple_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::Time;
 using disk_cache::SimpleIndexFile;
 using disk_cache::SimpleIndex;
 
 namespace disk_cache {
 
+// The Simple Cache backend requires a few guarantees from the filesystem like
+// atomic renaming of recently open files. Those guarantees are not provided in
+// general on Windows.
+#if defined(OS_POSIX)
+
 TEST(IndexMetadataTest, Basics) {
   SimpleIndexFile::IndexMetadata index_metadata;
 
   EXPECT_EQ(disk_cache::kSimpleIndexMagicNumber, index_metadata.magic_number_);
   EXPECT_EQ(disk_cache::kSimpleVersion, index_metadata.version_);
   EXPECT_EQ(0U, index_metadata.GetNumberOfEntries());
   EXPECT_EQ(0U, index_metadata.cache_size_);
 
   EXPECT_TRUE(index_metadata.CheckIndexMetadata());
 }
@@ skipping 197 matching lines @@
                                      GetCallback(),
                                      &load_index_result);
   base::RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(base::PathExists(index_path));
   ASSERT_TRUE(callback_called());
   EXPECT_TRUE(load_index_result.did_load);
   EXPECT_TRUE(load_index_result.flush_required);
 }
 
+#endif  // defined(OS_POSIX)
+
 }  // namespace disk_cache