write Page Guard

test/CMakeLists.txt

@@ -6,4 +6,6 @@ endif()
 add_executable(replacer_test replacer_test.cpp)
 target_link_libraries(replacer_test bpt GTest::gtest_main)
 add_executable(buffer_pool_manager_test buffer_pool_manager_test.cpp)
-target_link_libraries(buffer_pool_manager_test bpt GTest::gtest_main)
+target_link_libraries(buffer_pool_manager_test bpt GTest::gtest_main)
+add_executable(page_guard_test page_guard_test.cpp)
+target_link_libraries(page_guard_test bpt GTest::gtest_main)

test/page_guard_test.cpp

@@ -0,0 +1,34 @@
+#include <gtest/gtest.h>
+#include <cstdio>
+#include <cstring>
+#include <memory>
+#include <random>
+#include <string>
+#include "bpt/buffer_pool_manager.h"
+#include "bpt/config.h"
+
+TEST(PageGuardTest, DISABLED_SampleTest) {
+  const std::string db_name = "/tmp/test.db";
+  const size_t buffer_pool_size = 5;
+  const size_t k = 2;
+
+  auto disk_manager = std::make_shared<DiskManager>(db_name);
+  auto bpm = std::make_shared<BufferPoolManager>(buffer_pool_size, k, disk_manager.get());
+
+  page_id_t page_id_temp;
+  auto *page0 = bpm->NewPage(&page_id_temp);
+
+  auto guarded_page = BasicPageGuard(bpm.get(), page0);
+
+  EXPECT_EQ(page0->GetData(), guarded_page.GetData());
+  EXPECT_EQ(page0->GetPageId(), guarded_page.PageId());
+  EXPECT_EQ(1, page0->GetPinCount());
+
+  guarded_page.Drop();
+
+  EXPECT_EQ(0, page0->GetPinCount());
+
+  // Shutdown the disk manager and remove the temporary file we created.
+  disk_manager->Close();
+  remove(db_name.c_str());
+}