1 files changed, 51 insertions, 0 deletions
diff --git a/src/rocksdb/util/defer_test.cc b/src/rocksdb/util/defer_test.cc
new file mode 100644
index 000000000..0e98f68b6
--- /dev/null
+++ b/src/rocksdb/util/defer_test.cc
@@ -0,0 +1,51 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#include "util/defer.h"
+
+#include "port/port.h"
+#include "port/stack_trace.h"
+#include "test_util/testharness.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class DeferTest {};
+
+TEST(DeferTest, BlockScope) {
+  int v = 1;
+  {
+    Defer defer([&v]() { v *= 2; });
+  }
+  ASSERT_EQ(2, v);
+}
+
+TEST(DeferTest, FunctionScope) {
+  int v = 1;
+  auto f = [&v]() {
+    Defer defer([&v]() { v *= 2; });
+    v = 2;
+  };
+  f();
+  ASSERT_EQ(4, v);
+}
+
+TEST(SaveAndRestoreTest, BlockScope) {
+  int v = 1;
+  {
+    SaveAndRestore<int> sr(&v);
+    ASSERT_EQ(v, 1);
+    v = 2;
+    ASSERT_EQ(v, 2);
+  }
+  ASSERT_EQ(v, 1);
+}
+
+}  // namespace ROCKSDB_NAMESPACE
+
+int main(int argc, char** argv) {
+  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}