diff --git a/.github/workflows/gh-actions.yml b/.github/workflows/gh-actions.yml
index ef4660d..ee9fe18 100644
--- a/.github/workflows/gh-actions.yml
+++ b/.github/workflows/gh-actions.yml
@@ -93,8 +93,8 @@ jobs:
     - name: Build
       # Build your program with the given configuration. Note that --config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
       run: >
-        cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} # &&
-        # cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} --target vm_unit_tests
+        cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} &&
+        cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} --target vm_unit_tests
 
 
     - name: Test
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b8af2e..200d340 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,15 +38,14 @@ CPMAddPackage( "gh:psiha/std_fix#master"   )
 CPMAddPackage( "gh:psiha/err#master"       )
 CPMAddPackage( "gh:psiha/build#master"     )
 
-CPMAddPackage( "gh:google/googletest@1.14.0" )
-
-
+if ( ${CMAKE_SYSTEM_NAME} MATCHES "Linux" )
+    set( PSI_USE_LINKER "lld" ) # for thinlto-cache-dir support
+endif()
 include( ${build_SOURCE_DIR}/build_options.cmake )
 
 PSI_add_compile_options( Debug ${PSI_compiler_runtime_sanity_checks} )
 PSI_add_link_options   ( Debug ${PSI_linker_runtime_sanity_checks}   )
   
-set( CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE true )
 PSI_add_link_options   ( Release ${PSI_linker_LTO} )
 PSI_add_compile_options( Release ${PSI_compiler_LTO} ${PSI_compiler_optimize_for_size} ${PSI_compiler_disable_thread_safe_init} ${PSI_compiler_fastmath} ${PSI_compiler_debug_symbols} )
 
@@ -54,13 +53,24 @@ if ( WIN32 )
   add_compile_definitions( WIN32_LEAN_AND_MEAN NOMINMAX NOCOMM )
 endif()
 
+if ( ${CMAKE_SYSTEM_NAME} MATCHES "Linux" )
+    PSI_add_link_options( Release -flto ) # lld does not seem to be enough
+    add_compile_options( -stdlib=libc++ )
+    # Needed under WSL for some reason?
+    PSI_add_link_options( Debug -lc++ -lc++abi -lubsan )
+else()
+set( CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE true )
+PSI_add_link_options( Release ${PSI_linker_LTO} )
+endif()
+
+
 ###################
 ## Target(s)
 ###################
 
 include( vm.cmake )
 
-target_link_libraries( psi_vm PRIVATE
+target_link_libraries( psi_vm PUBLIC
   Boost::core
   Boost::assert
   Boost::preprocessor
@@ -68,16 +78,14 @@ target_link_libraries( psi_vm PRIVATE
   Boost::utility
 )
 
-target_include_directories( psi_vm PRIVATE
-  "${assert_SOURCE_DIR}/include"
-  "${core_SOURCE_DIR}/include"
-  "${preprocessor_SOURCE_DIR}/include"
-  "${winapi_SOURCE_DIR}/include"
-  "${utility_SOURCE_DIR}/include"
+target_include_directories( psi_vm PUBLIC
+  "${build_SOURCE_DIR}/include"
   "${config_ex_SOURCE_DIR}/include"
-  "${std_fix_SOURCE_DIR}/include"
   "${err_SOURCE_DIR}/include"
-  "${build_SOURCE_DIR}/include"
+)
+
+target_include_directories( psi_vm PRIVATE
+  "${std_fix_SOURCE_DIR}/include"
 )
 
 ###################
@@ -85,5 +93,4 @@ target_include_directories( psi_vm PRIVATE
 ###################
 
 enable_testing()
-
 add_subdirectory( "${PROJECT_SOURCE_DIR}/test" )
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 10082dd..5d21b04 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,44 +1,33 @@
-# TESTS
-include(GoogleTest)
+# psi::vm tests
 
-# set(
-#     vm_test_sources
-# 
-#     # Common
-#     "${PROJECT_SOURCE_DIR}/test/pch.hpp"
-# 
-#     # Core tests
-#     "${CMAKE_CURRENT_SOURCE_DIR}/vector_test.cpp"
-# )
-# 
-# Creating executable test target
-# add_executable(rama_unit_tests EXCLUDE_FROM_ALL ${rama_test_sources})
-# target_link_libraries(rama_unit_tests database api GTest::gtest GTest::gtest_main Boost::boost Boost.Container )
-# target_precompile_headers(rama_unit_tests PRIVATE "${PROJECT_SOURCE_DIR}/test/pch.hpp")
-# target_include_directories(
-#     rama_unit_tests
-#     PRIVATE
-#         ${PROJECT_SOURCE_DIR}/src
-#         ${PROJECT_SOURCE_DIR}/deps/gtest/googletest/include
-#         ${PROJECT_SOURCE_DIR}/deps/range-v3/include
-#         ${PROJECT_SOURCE_DIR}/deps/psiha/std_fix/include
-# )
-# set_target_properties(
-#     rama_unit_tests
-#     PROPERTIES
-#     RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/test"
-#     COMMAND rama_unit_tests
-# )
-# 
-# gtest_discover_tests(
-#     rama_unit_tests
-#     EXTRA_ARGS
-#     --gtest_color=auto
-#     --gtest_output=xml:${CMAKE_BINARY_DIR}/test/rama_unit_tests.xml
-#     --gtest_catch_exceptions=0
-#     DISCOVERY_TIMEOUT 120
-#     PROPERTIES
-#     TIMEOUT 120
-# )
-# 
-# add_test("rama_unit_tests" rama_unit_tests)
+# Fix ODR violations and compiler and linker option mismatches: add GTest after everything is already setup.
+CPMAddPackage( "gh:google/googletest@1.14.0" )
+
+include( GoogleTest )
+
+set( vm_test_sources
+    "${CMAKE_CURRENT_SOURCE_DIR}/vector.cpp"
+)
+
+add_executable( vm_unit_tests EXCLUDE_FROM_ALL ${vm_test_sources} )
+target_link_libraries( vm_unit_tests PRIVATE GTest::gtest GTest::gtest_main psi::vm )
+
+set_target_properties(
+    vm_unit_tests
+    PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/test"
+    COMMAND vm_unit_tests
+)
+
+gtest_discover_tests(
+    vm_unit_tests
+    EXTRA_ARGS
+    --gtest_color=auto
+    --gtest_output=xml:${CMAKE_BINARY_DIR}/test/vm_unit_tests.xml
+    --gtest_catch_exceptions=1
+    DISCOVERY_TIMEOUT 120
+    PROPERTIES
+    TIMEOUT 120
+)
+
+add_test( "vm_unit_tests" vm_unit_tests )
diff --git a/test/vector.cpp b/test/vector.cpp
new file mode 100644
index 0000000..cb9ad46
--- /dev/null
+++ b/test/vector.cpp
@@ -0,0 +1,39 @@
+#include <psi/vm/vector.hpp>
+
+#include <gtest/gtest.h>
+
+#include <complex>
+#include <cstdint>
+#include <filesystem>
+//------------------------------------------------------------------------------
+namespace psi::vm
+{
+//------------------------------------------------------------------------------
+
+TEST( vector, playground )
+{
+    std::filesystem::path const test_vec{ "test_vec" };
+    std::filesystem::remove( test_vec );
+    {
+        psi::vm::vector< double, std::uint16_t > vec;
+        vec.open( test_vec.c_str() );
+        EXPECT_EQ( vec.size(), 0 );
+        vec.append_range({ 3.14, 0.14, 0.04 });
+        EXPECT_EQ( vec.size(), 3 );
+        EXPECT_EQ( vec[ 0 ], 3.14 );
+        EXPECT_EQ( vec[ 1 ], 0.14 );
+        EXPECT_EQ( vec[ 2 ], 0.04 );
+    }
+    {
+        psi::vm::vector< double, std::uint16_t > vec;
+        vec.open( test_vec.c_str() );
+        EXPECT_EQ( vec.size(), 3 );
+        EXPECT_EQ( vec[ 0 ], 3.14 );
+        EXPECT_EQ( vec[ 1 ], 0.14 );
+        EXPECT_EQ( vec[ 2 ], 0.04 );
+    }
+}
+
+//------------------------------------------------------------------------------
+} // namespace psi::vm
+//------------------------------------------------------------------------------