diff --git a/test/buffer/counter.h b/test/buffer/counter.h
deleted file mode 100644
index f62c05efb..000000000
--- a/test/buffer/counter.h
+++ /dev/null
@@ -1,90 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                         BusTub
-//
-// counter.h
-//
-// Identification: test/buffer/counter.h
-//
-// Copyright (c) 2015-2019, Carnegie Mellon University Database Group
-//
-//===----------------------------------------------------------------------===//
-
-#pragma once
-
-#include <atomic>
-
-#include "gtest/gtest.h"
-
-namespace bustub {
-
-enum FuncType { FetchPage, UnpinPage, FlushPage, NewPage, DeletePage, FlushAllPages };
-
-struct Counter {
-  // 0-FetchPage  1-UnpinPage  2-FlushPage 3-NewPage 4-DeletePage
-  // 5-FlushAllPages
-  static const int num_types = 6;
-  std::atomic_int counts[num_types];
-
-  void Reset() {
-    for (auto &count : counts) {
-      count = 0;
-    }
-  }
-
-  void AddCount(FuncType func_type) { ++counts[func_type]; }
-
-  // Make sure fetch page function only calls fetch page once and
-  // does not call other functions
-  void CheckFetchPage() {
-    EXPECT_EQ(counts[0], 1) << "has to call FetchPage once";
-    for (int i = 1; i < num_types; ++i) {
-      EXPECT_EQ(counts[i], 0) << "FetchPage Should not call other functions";
-    }
-  }
-
-  void CheckUnpinPage() {
-    EXPECT_EQ(counts[1], 1) << "has to call UnpinPage once";
-    for (int i = 0; i < num_types; ++i) {
-      if (i != 1) {
-        EXPECT_EQ(counts[i], 0) << "UnPinPage Should not call other functions";
-      }
-    }
-  }
-
-  void CheckFlushPage() {
-    EXPECT_EQ(counts[2], 1) << "has to call FlushPage once";
-    for (int i = 0; i < num_types; ++i) {
-      if (i != 2) {
-        EXPECT_EQ(counts[i], 0) << "FlushPage Should not call other functions";
-      }
-    }
-  }
-
-  void CheckNewPage() {
-    EXPECT_EQ(counts[3], 1) << "has to call NewPage once";
-    for (int i = 0; i < num_types; ++i) {
-      if (i != 3) {
-        EXPECT_EQ(counts[i], 0) << "NewPage Should not call other functions";
-      }
-    }
-  }
-
-  void CheckDeletePage() {
-    EXPECT_EQ(counts[4], 1) << "has to call DeletePage once";
-    for (int i = 0; i < num_types; ++i) {
-      if (i != 4) {
-        EXPECT_EQ(counts[i], 0) << "DeletePage Should not call other functions";
-      }
-    }
-  }
-
-  void CheckFlushAllPages() {
-    for (int i = 1; i < 5; ++i) {
-      EXPECT_EQ(counts[i], 0) << "FlushAllPage Should not call other functions";
-    }
-    EXPECT_EQ(counts[5], 1) << "has to call FlushAllPage once";
-  }
-};
-
-}  // namespace bustub