message: Use FileBuffer in test_file_system
diff: #include "common/file_system.hpp"
  #include "common/fstream.hpp"
  #include "test_helpers.hpp"
  +#include "common/file_buffer.hpp"
  using namespace duckdb;
  using namespace std;
  @@ -65,8 +66,11 @@ TEST_CASE("Make sure file system operators work as advertised", "[file_system]")
  TEST_CASE("Test file operations", "[file_system]") {
  FileSystem fs;
  unique_ptr<FileHandle> handle, handle2;
  - int64_t test_data[INTEGER_COUNT];
  - int64_t test_data2[INTEGER_COUNT];
  + auto test_buffer1 = make_unique<FileBuffer>(INTEGER_COUNT * sizeof(int64_t));
  + auto test_buffer2 = make_unique<FileBuffer>(INTEGER_COUNT * sizeof(int64_t));
  +
  + int64_t *test_data = (int64_t *)test_buffer1->buffer;
  + int64_t *test_data2 = (int64_t *)test_buffer2->buffer;
  for (int i = 0; i < INTEGER_COUNT; i++) {
  test_data[i] = i;
  test_data2[i] = 0;
  