Add test for DiskScheduler. (#607)

Author: fernandolis10

src/include/buffer/buffer_pool_manager.h

@@ -72,7 +72,7 @@ class BufferPoolManager {
   auto NewPage(page_id_t *page_id) -> Page *;
 
   /**
-   * TODO(P1): Add implementation
+   * TODO(P2): Add implementation
    *
    * @brief PageGuard wrapper for NewPage
    *
@@ -105,7 +105,7 @@ class BufferPoolManager {
   auto FetchPage(page_id_t page_id, AccessType access_type = AccessType::Unknown) -> Page *;
 
   /**
-   * TODO(P1): Add implementation
+   * TODO(P2): Add implementation
    *
    * @brief PageGuard wrappers for FetchPage
    *

test/storage/disk_scheduler_test.cpp

@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+//                         BusTub
+//
+// disk_manager_test.cpp
+//
+// Identification: test/storage/disk/disk_scheduler_test.cpp
+//
+// Copyright (c) 2015-2023, Carnegie Mellon University Database Group
+//
+//===----------------------------------------------------------------------===//
+
+#include <cstring>
+#include <future>  // NOLINT
+#include <memory>
+
+#include "common/exception.h"
+#include "gtest/gtest.h"
+#include "storage/disk/disk_manager_memory.h"
+#include "storage/disk/disk_scheduler.h"
+
+namespace bustub {
+
+using bustub::DiskManagerUnlimitedMemory;
+
+// NOLINTNEXTLINE
+TEST(DiskSchedulerTest, DISABLED_ScheduleWriteReadPageTest) {
+  char buf[BUSTUB_PAGE_SIZE] = {0};
+  char data[BUSTUB_PAGE_SIZE] = {0};
+
+  auto dm = std::make_unique<DiskManagerUnlimitedMemory>();
+  auto disk_scheduler = std::make_unique<DiskScheduler>(dm.get());
+
+  std::strncpy(data, "A test string.", sizeof(data));
+
+  std::promise<bool> promise1;
+  auto future1 = promise1.get_future();
+  std::promise<bool> promise2;
+  auto future2 = promise2.get_future();
+
+  disk_scheduler->Schedule({/*is_write=*/true, reinterpret_cast<char *>(&data), /*page_id=*/0, promise1});
+  disk_scheduler->Schedule({/*is_write=*/false, reinterpret_cast<char *>(&buf), /*page_id=*/0, promise2});
+
+  ASSERT_TRUE(future1.get());
+  ASSERT_TRUE(future2.get());
+  ASSERT_EQ(std::memcmp(buf, data, sizeof(buf)), 0);
+
+  disk_scheduler = nullptr;  // Call the DiskScheduler destructor to finish all scheduled jobs.
+  dm->ShutDown();
+}
+
+}  // namespace bustub