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54 Zeilen
1.6 KiB
54 Zeilen
1.6 KiB
// Copyright (c) 2013 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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// Test for issue 200: when iterator switches direction from backward
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// to forward, the current key can be yielded unexpectedly if a new
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// mutation has been added just before the current key.
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#include "gtest/gtest.h"
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#include "leveldb/db.h"
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#include "util/testutil.h"
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namespace leveldb {
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TEST(Issue200, Test) {
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// Get rid of any state from an old run.
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std::string dbpath = testing::TempDir() + "leveldb_issue200_test";
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DestroyDB(dbpath, Options());
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DB* db;
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Options options;
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options.create_if_missing = true;
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ASSERT_LEVELDB_OK(DB::Open(options, dbpath, &db));
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WriteOptions write_options;
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ASSERT_LEVELDB_OK(db->Put(write_options, "1", "b"));
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ASSERT_LEVELDB_OK(db->Put(write_options, "2", "c"));
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ASSERT_LEVELDB_OK(db->Put(write_options, "3", "d"));
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ASSERT_LEVELDB_OK(db->Put(write_options, "4", "e"));
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ASSERT_LEVELDB_OK(db->Put(write_options, "5", "f"));
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ReadOptions read_options;
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Iterator* iter = db->NewIterator(read_options);
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// Add an element that should not be reflected in the iterator.
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ASSERT_LEVELDB_OK(db->Put(write_options, "25", "cd"));
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iter->Seek("5");
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ASSERT_EQ(iter->key().ToString(), "5");
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iter->Prev();
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ASSERT_EQ(iter->key().ToString(), "4");
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iter->Prev();
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ASSERT_EQ(iter->key().ToString(), "3");
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iter->Next();
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ASSERT_EQ(iter->key().ToString(), "4");
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iter->Next();
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ASSERT_EQ(iter->key().ToString(), "5");
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delete iter;
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delete db;
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DestroyDB(dbpath, options);
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}
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} // namespace leveldb
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