MS-565 rename test->unittest and fix parameter autotune bug

Former-commit-id: 65392a505107e20491035d417940a66e67f82ef9

cpp/src/core/CMakeLists.txt

@@ -95,7 +95,7 @@ endif()
 set(CORE_INCLUDE_DIRS ${CORE_INCLUDE_DIRS} PARENT_SCOPE)
 
 if(BUILD_UNIT_TEST STREQUAL "ON")
-    add_subdirectory(test)
+    add_subdirectory(unittest)
 endif()
 
 config_summary()

cpp/src/core/unittest/CMakeLists.txt

@@ -30,7 +30,7 @@ set(util_srcs
         ${CORE_SOURCE_DIR}/knowhere/knowhere/adapter/ArrowAdapter.cpp
         ${CORE_SOURCE_DIR}/knowhere/knowhere/common/Exception.cpp
         ${CORE_SOURCE_DIR}/knowhere/knowhere/common/Timer.cpp
-        ${CORE_SOURCE_DIR}/test/utils.cpp
+        ${CORE_SOURCE_DIR}/unittest/utils.cpp
         )
 
 #<IVF-TEST>

cpp/src/core/unittest/test_idmap.cpp

@@ -23,7 +23,7 @@
 #include "knowhere/index/vector_index/IndexIDMAP.h"
 #include "knowhere/index/vector_index/helpers/Cloner.h"
 
-#include "test/utils.h"
+#include "unittest/utils.h"
 
 namespace {
 

cpp/src/core/unittest/test_ivf.cpp

@@ -35,7 +35,7 @@
 #include "knowhere/index/vector_index/IndexIVFSQ.h"
 #include "knowhere/index/vector_index/helpers/Cloner.h"
 
-#include "test/utils.h"
+#include "unittest/utils.h"
 
 namespace {
 

cpp/src/core/unittest/test_kdt.cpp

@@ -26,7 +26,7 @@
 #include "knowhere/index/vector_index/IndexKDT.h"
 #include "knowhere/index/vector_index/helpers/Definitions.h"
 
-#include "test/utils.h"
+#include "unittest/utils.h"
 
 namespace {
 

cpp/src/core/unittest/test_nsg/test_nsg.cpp

@@ -24,7 +24,7 @@
 #include "knowhere/index/vector_index/helpers/FaissGpuResourceMgr.h"
 #include "knowhere/index/vector_index/nsg/NSGIO.h"
 
-#include "test/utils.h"
+#include "unittest/utils.h"
 
 namespace {
 

cpp/src/core/unittest/utils.cpp

@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "test/utils.h"
+#include "unittest/utils.h"
 
 #include <memory>
 #include <string>

cpp/src/wrapper/ConfAdapter.cpp

@@ -81,7 +81,7 @@ IVFConfAdapter::MatchNlist(const int64_t& size, const int64_t& nlist) {
         // calculate a proper nlist if nlist not specified or size less than TYPICAL_COUNT
         return int(size / TYPICAL_COUNT * 16384);
     }
-    return 0;
+    return nlist;
 }
 
 knowhere::Config