修改单元测试的namespace.

Changes to be committed:
	modified:   tests/test_allocate.cpp
	modified:   tests/test_bloomfilter.cpp
	modified:   tests/test_data_block_builder.cpp
	modified:   tests/test_file_reader.cpp
	modified:   tests/test_file_writer.cpp
	modified:   tests/test_filter_block_builder.cpp
	modified:   tests/test_footer_builder.cpp
	modified:   tests/test_index_block_builder.cpp
	modified:   tests/test_lru_cache.cpp
	modified:   tests/test_memtable.cpp
	modified:   tests/test_murmur_hash.cpp
	modified:   tests/test_skiplist.cpp
	modified:   tests/test_sstable_builder.cpp

tests/test_allocate.cpp

@@ -7,7 +7,7 @@
 #include "../src/memory/allocate.h"
 #include "../src/log/log.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
 
     TEST(FreeListAllocate_Allocate, basic) {
         std::unique_ptr<FreeListAllocate> allocator = std::make_unique<FreeListAllocate>();

tests/test_bloomfilter.cpp

@@ -6,7 +6,7 @@
 #include "../src/filter/bloom_filter.h"
 #include "../src/filter/filter_policy.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(BloomFilter, basic) {
         std::vector<std::string> data;
         for (int i = 0; i < 10 * 10000; ++i) {

tests/test_data_block_builder.cpp

@@ -9,7 +9,7 @@
 #include "../src/utils/codec.h"
 #include "../src/db/offset_info.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(data_block_builder, add) {
         auto logger = log::get_logger();
         auto builder = std::make_unique<DataBlockBuilder>();

tests/test_file_reader.cpp

@@ -9,7 +9,7 @@
 #include "../src/file/file_writer.h"
 #include "../src/log/log.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(file_reader, basic) {
         auto logger = log::get_logger();
         // 新建文件

tests/test_file_writer.cpp

@@ -8,7 +8,7 @@
 #include "../src/file/file_writer.h"
 #include "../src/log/log.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(file_writer, basic) {
         auto logger = log::get_logger();
         std::string path = "./build/tests.sst";

tests/test_filter_block_builder.cpp

@@ -5,7 +5,7 @@
 #include <gtest/gtest.h>
 #include "../src/table/filter_block_builder.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(filter_block_builder, basic) {
         std::vector<std::string> data;
         for (int i = 0; i < 10 * 10000; ++i) {

tests/test_footer_builder.cpp

@@ -5,7 +5,7 @@
 #include <gtest/gtest.h>
 #include "../src/table/footer_builder.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(FooterBuilder, basic) {
         /*
          * Footer模块_data数据schema如下所示：

tests/test_index_block_builder.cpp

@@ -9,7 +9,7 @@
 #include "../src/utils/codec.h"
 #include "../src/db/offset_info.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(index_block_builder, add) {
         auto logger = log::get_logger();
         auto builder = std::make_unique<IndexBlockBuilder>();

tests/test_lru_cache.cpp

@@ -10,7 +10,7 @@
 #include "../src/cache/cache.h"
 #include "../src/cache/cache_policy.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(lru_cache, insert) {
         auto cache_holder = std::make_unique<Cache<std::string, std::string>>(5000);
 

tests/test_memtable.cpp

@@ -9,7 +9,7 @@
 #include "memtable/memtable.h"
 #include "memory/allocate.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(MemTable, Insert__Add) {
         auto alloc = std::make_shared<FreeListAllocate>();
         auto mem_table = std::make_shared<MemTable>(alloc);

tests/test_murmur_hash.cpp

@@ -4,7 +4,7 @@
 #include <gtest/gtest.h>
 #include "../src/utils/murmur_hash2.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(MurmurHash, basic) {
         EXPECT_EQ(utils::murmur_hash2("123", 3), 1023762986);
     }

tests/test_skiplist.cpp

@@ -9,7 +9,7 @@
 #include "memtable/skiplist.h"
 #include "memory/allocate.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     TEST(skiplist, Insert) {
         auto alloc = std::make_shared<FreeListAllocate>();
         std::shared_ptr<SkipList<std::string, std::string>> skiplist =

tests/test_sstable_builder.cpp

@@ -8,7 +8,7 @@
 #include "../src/file/file_reader.h"
 #include "../src/utils/codec.h"
 
-namespace smallkv {
+namespace smallkv::unittest {
     /*
      * SST结构
      * SSTable的数据排布schema：