diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7477033d2d..b321a4160e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,9 +4,11 @@ project(core)
 
 set(CORE_ROOT_DIR "${CMAKE_CURRENT_LIST_DIR}")
 
+add_custom_target(tests)
+get_property(all_tests GLOBAL PROPERTY TEST_TARGETS)
+
 include(${CORE_ROOT_DIR}/common.cmake)
 
-# platform-specific compile flags
 if(EMSCRIPTEN)
 
     add_subdirectory( "${CORE_ROOT_DIR}/OfficeUtils/js" zlib )
@@ -15,6 +17,7 @@ if(EMSCRIPTEN)
     add_subdirectory( "${CORE_ROOT_DIR}/Common/3dParty/hunspell" spell )
     add_subdirectory( "${CORE_ROOT_DIR}/DesktopEditor/fontengine/js" fonts )
     add_subdirectory( "${CORE_ROOT_DIR}/DesktopEditor/graphics/pro/js/" drawingfile )
+
 else()
 
     add_compile_options(-march=native)
@@ -26,50 +29,10 @@ else()
     add_subdirectory( "${CORE_ROOT_DIR}/DesktopEditor/doctrenderer/app_builder" docbuilder )
     add_subdirectory( "${CORE_ROOT_DIR}/PdfFile/Resources/CMapMemory" cmapbin )
 
-    #[[
-    set( ALL_ARTIFACTS
-        UnicodeConverter
-        kernel
-        kernel_network
-        Fb2File
-        PdfFile
-        HtmlFile2
-        EpubFile
-        XpsFile
-        OFDFile
-        DjVuFile
-        DocxRenderer
-        doctrenderer
-        IWorkFile
-        HWPFile
-        graphics
-        x2tlib
-        allfontsgen
-        allthemesgen
-        pluginsmanager
-        docbuilder
-        x2t
-    )
-
-    add_custom_target(copy_artifacts ALL
-        COMMENT "Copying all artifacts into ${EO_CORE_OUTPUT_DIR}"
-    )
-
-    add_dependencies(copy_artifacts ${ALL_ARTIFACTS})
-
-    foreach(artifact ${ALL_ARTIFACTS})
-        add_custom_command(TARGET copy_artifacts POST_BUILD
-            COMMAND ${CMAKE_COMMAND} -E make_directory "${EO_CORE_OUTPUT_DIR}"
-            COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:${artifact}> "${EO_CORE_OUTPUT_DIR}/"
-            COMMENT "Copying ${artifact} to ${EO_CORE_OUTPUT_DIR}"
-        )
-    endforeach()
+    add_subdirectory( "${CORE_ROOT_DIR}/Common/3dParty/openssl/test" )
 
-    add_custom_command(TARGET copy_artifacts POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E make_directory "${EO_CORE_OUTPUT_DIR}"
-        COMMAND /bin/sh -c "cp -P \"${EO_CORE_3RD_PARTY_INSTALL_DIR}/icu/lib\"/*.so* \"${EO_CORE_OUTPUT_DIR}/\""
-        COMMENT "Copying ICU libs to ${EO_CORE_OUTPUT_DIR}"
-    )
-    ]]
+    if(all_tests)
+        add_dependencies(tests ${all_tests})
+    endif()
 
 endif()
diff --git a/Common/3dParty/brotli/nc-fetch.sh b/Common/3dParty/brotli/nc-fetch.sh
index de32637760..afc94fff71 100755
--- a/Common/3dParty/brotli/nc-fetch.sh
+++ b/Common/3dParty/brotli/nc-fetch.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 install_dir="$1"
+git_tag="v1.2.0"
 
 abort_op()
 {
@@ -25,11 +26,7 @@ fi
 
 echo "Fetching Brotli"
 
-mkdir -p "$install_dir" || abort_op "Failed to create brotli directory."
-cd "$install_dir"
-git init || abort_op "Git init failed (brotli)"
-git remote add origin https://github.com/google/brotli.git || abort_op "Failed to add brotli remote"
-git fetch --depth 1 origin a47d7475063eb223c87632eed806c0070e70da29 || abort_op "Failed to fetch a47d7475063eb223c87632eed806c0070e70da29"
-git checkout FETCH_HEAD || abort_op "Check-out failed (brotli)"
+git clone --depth=1 --branch $git_tag https://github.com/google/brotli.git "$install_dir" \
+    || abort_op "Failed to clone brotli repo"
 
 echo "Brotli ready!"
diff --git a/Common/3dParty/icu/nc-build.sh b/Common/3dParty/icu/nc-build.sh
index 4b94edb305..6912bf679a 100755
--- a/Common/3dParty/icu/nc-build.sh
+++ b/Common/3dParty/icu/nc-build.sh
@@ -4,7 +4,6 @@ work_dir="$1"
 install_dir="$2"
 icu_major=$3
 icu_minor=$4
-fetch_only=${5:-0}
 
 abort_op()
 {
@@ -57,11 +56,8 @@ CXXFLAGS="-static-libstdc++ -static-libgcc" \
 LDFLAGS='-Wl,-rpath,$$ORIGIN' \
 || abort_op "Configure failed"
 
-if [ "$fetch_only" -eq 0 ]; then
-    make -j10 && make install || abort_op "Build failed"
+make -j10 && make install || abort_op "Build failed"
 
-    echo "ICU ready! (work dir will be removed)"
-    rm -rf "$work_dir"
-fi
+echo "ICU ready!"
 
 exit 0
diff --git a/Common/3dParty/openssl/nc-build.sh b/Common/3dParty/openssl/nc-build.sh
index c28d1cd43d..ff97dcb99f 100755
--- a/Common/3dParty/openssl/nc-build.sh
+++ b/Common/3dParty/openssl/nc-build.sh
@@ -2,8 +2,11 @@
 
 work_dir="$1"
 install_dir="$2"
-keep_work=${3:-0}
+keep_work=${3:-""}
 
+script_dir="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
+patches_dir="$script_dir/../../../DesktopEditor/graphics/pro/js/wasm/patches"
+# DesktopEditor/graphics/pro/js/wasm/patches/fix-wasm-openssl.patch 
 abort_op()
 {
     rm -rf "$work_dir"
@@ -33,12 +36,16 @@ fi
 mkdir -p "$work_dir" || abort_op "Failed to create work dir: [$work_dir]"
 
 echo "Fetching OpenSSL repo into: [$work_dir]"
-git clone --depth=1 --branch OpenSSL_1_1_1f https://github.com/openssl/openssl.git "$work_dir" \
+git clone --depth 1 --branch openssl-3.6.1 https://github.com/openssl/openssl.git "$work_dir" \
     || abort_op "Git clone failed!"
 
+echo "Patching OpenSSL"
+cd "$work_dir"
+git apply "$patches_dir/fix-wasm-openssl.patch" || abort_op "Failed to apply fix-wasm-openssl.patch"
+
 echo "Building OpenSSL"
 cd "$work_dir"
-./config enable-md2 no-shared no-asm --prefix=$install_dir --openssldir=$install_dir \
+./config enable-md2 no-shared no-asm no-afalgeng --prefix=$install_dir --openssldir=$install_dir \
     || abort_op "Configuration failed!"
 
 make -j10 || abort_op "Build failed!"
@@ -46,9 +53,12 @@ make -j10 || abort_op "Build failed!"
 echo "Installing OpenSSL to: [$install_dir]"
 make install || abort_op "Install failed!"
 
-if [ "$keep_work" -eq 0 ]; then
-    echo "OpenSSL ready! (work dir will be removed)"
+echo "OpenSSL ready!"
+
+if [ "$keep_work" == "dont_keep_workdir" ]; then
+    echo "Work dir will be removed."
     rm -rf "$work_dir"
 fi
 
 exit 0
+
diff --git a/Common/3dParty/openssl/test/CMakeLists.txt b/Common/3dParty/openssl/test/CMakeLists.txt
new file mode 100644
index 0000000000..bcd07cb559
--- /dev/null
+++ b/Common/3dParty/openssl/test/CMakeLists.txt
@@ -0,0 +1,71 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(openssl_test)
+
+set(CORE_ROOT_DIR "${CMAKE_CURRENT_LIST_DIR}/../../../..")
+set(OPENSSL_COMMON_SRC_DIR "${CMAKE_CURRENT_LIST_DIR}/../common")
+
+include(${CORE_ROOT_DIR}/common.cmake)
+
+if(NOT TARGET kernel)
+    add_subdirectory(${CORE_ROOT_DIR}/Common kernel)
+endif()
+
+message( "Fetch and build OpenSSL" )
+set(OPENSSL_3RDPARTY_DIR "${CORE_ROOT_DIR}/Common/3dParty/openssl")
+set(OPENSSL_INSTALL_DIR "${EO_CORE_3RD_PARTY_INSTALL_DIR}/openssl_build_linux_64")
+get_filename_component(OPENSSL_3RDPARTY_DIR_ABS "${OPENSSL_3RDPARTY_DIR}" ABSOLUTE)
+get_filename_component(OPENSSL_INSTALL_DIR_ABS "${OPENSSL_INSTALL_DIR}" ABSOLUTE)
+execute_process(
+    COMMAND_ECHO STDOUT
+    COMMAND ./nc-build.sh "${EO_CORE_3RD_PARTY_WORK_DIR}/openssl" "${OPENSSL_INSTALL_DIR}"
+    WORKING_DIRECTORY ${OPENSSL_3RDPARTY_DIR_ABS}
+)
+
+
+add_executable(openssl_test
+    ${OPENSSL_COMMON_SRC_DIR}/common_openssl.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/main.cpp
+
+    ${OPENSSL_COMMON_SRC_DIR}/common_openssl.h
+)
+
+set_default_options(openssl_test)
+
+target_include_directories(openssl_test PRIVATE
+    ${OPENSSL_INSTALL_DIR}/include
+)
+
+target_link_libraries(openssl_test PRIVATE
+    ${OPENSSL_INSTALL_DIR_ABS}/lib64/libssl.a
+    ${OPENSSL_INSTALL_DIR_ABS}/lib64/libcrypto.a
+)
+
+target_link_libraries(openssl_test PUBLIC
+    kernel
+)
+
+copy_icu_libs(openssl_test)
+
+
+
+target_link_libraries(openssl_test PRIVATE doctest::doctest)
+
+# Modify rpath so test binary can run properly
+get_target_property(old_rpath openssl_test BUILD_RPATH)
+if(old_rpath)
+    set(new_rpath "${old_rpath}:${EO_CORE_OUTPUT_DIR}")
+else()
+    set(new_rpath "${EO_CORE_OUTPUT_DIR}")
+endif()
+set_target_properties(openssl_test PROPERTIES
+    BUILD_RPATH "${new_rpath}"
+    INSTALL_RPATH "${new_rpath}"
+)
+
+register_test_target(openssl_tests)
+
+include(${doctest_SOURCE_DIR}/scripts/cmake/doctest.cmake)
+doctest_discover_tests(openssl_test
+     TEST_PREFIX "openssl."
+)
diff --git a/Common/3dParty/openssl/test/main.cpp b/Common/3dParty/openssl/test/main.cpp
index 3c9c663dab..a295c18471 100644
--- a/Common/3dParty/openssl/test/main.cpp
+++ b/Common/3dParty/openssl/test/main.cpp
@@ -30,27 +30,33 @@
  *
  */
 
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include <doctest/doctest.h>
+
+#include <string>
+  
 #include "./../common/common_openssl.h"
 
-int main(int argc, char *argv[])
+TEST_SUITE( "OpenSSL" )
 {
-    argc;
-    argv;
-    if (true)
+    TEST_CASE( "SHA-256" )
     {
         std::string sTestHashString = "knoejnrgijwenrgiojwnergjiwnerigjnwerojgnweorigjn";
         unsigned int data_len = 0;
         unsigned char* data = NSOpenSSL::GetHash((unsigned char*)sTestHashString.c_str(), (unsigned int)sTestHashString.length(), OPENSSL_HASH_ALG_SHA256, data_len);
         std::string sResult = NSOpenSSL::Serialize(data, data_len, OPENSSL_SERIALIZE_TYPE_HEX);
+
         NSOpenSSL::openssl_free(data);
+
+        const std::string sExpectedResult = "913DD5544D5C726A40D551ACE85B29ABBBD4E2ADF2F4DA5BD07CEC07680CF5CD";
+        CHECK( sResult == sExpectedResult );
     }
 
-    if (true)
+    TEST_CASE( "RSA" )
     {
         unsigned char* publicKey = NULL;
         unsigned char* privateKey = NULL;
         bool bRes = NSOpenSSL::RSA_GenerateKeys(publicKey, privateKey);
-        bRes;
 
         std::string sPublic((char*)publicKey);
         std::string sPrivate((char*)privateKey);
@@ -58,37 +64,35 @@ int main(int argc, char *argv[])
         NSOpenSSL::openssl_free(publicKey);
         NSOpenSSL::openssl_free(privateKey);
 
-        std::string sMessage = "Hello world";
+        const std::string sMessage = "Hello world";
 
         unsigned char* message_crypt = NULL;
         unsigned int message_crypt_len = 0;
-        bool bEncrypt = NSOpenSSL::RSA_EncryptPublic((unsigned char*)sPublic.c_str(), (unsigned char*)sMessage.c_str(), (unsigned int)sMessage.length(), message_crypt, message_crypt_len);
-        bEncrypt;
+        bool bEncrypt = NSOpenSSL::RSA_EncryptPublic((unsigned char*)sPublic.c_str(), (const unsigned char*)sMessage.c_str(), (unsigned int)sMessage.length(), message_crypt, message_crypt_len);
 
         unsigned char* message_decrypt = NULL;
         unsigned int message_decrypt_len = 0;
 
         bool bDecrypt = NSOpenSSL::RSA_DecryptPrivate((unsigned char*)sPrivate.c_str(), message_crypt, message_crypt_len, message_decrypt, message_decrypt_len);
-        bDecrypt;
 
         std::string sMessageOut((char*)message_decrypt, message_decrypt_len);
 
         NSOpenSSL::openssl_free(message_crypt);
         NSOpenSSL::openssl_free(message_decrypt);
+
+        CHECK( sMessageOut == sMessage );
     }
 
-    if (true)
+    TEST_CASE( "AES" )
     {
-        std::string password = "{PASSWORD}";
-        std::string message = "{MESSAGE}";
+        const std::string password = "{PASSWORD}";
+        const std::string message = "{MESSAGE}";
         std::string message_crypted = "";
         std::string message_decrypted = "";
 
         NSOpenSSL::AES_Encrypt_desktop(password, message, message_crypted);
         NSOpenSSL::AES_Decrypt_desktop(password, message_crypted, message_decrypted);
 
-        message;
+        CHECK( message_decrypted == message );
     }
-
-    return 0;
 }
diff --git a/Common/Network/CMakeLists.txt b/Common/Network/CMakeLists.txt
index 899e7f274c..7709343618 100644
--- a/Common/Network/CMakeLists.txt
+++ b/Common/Network/CMakeLists.txt
@@ -114,8 +114,8 @@ target_include_directories(kernel_network PRIVATE
 )
 
 target_link_libraries(kernel_network PRIVATE
-    ${OPENSSL_INSTALL_DIR_ABS}/lib/libssl.a
-    ${OPENSSL_INSTALL_DIR_ABS}/lib/libcrypto.a
+    ${OPENSSL_INSTALL_DIR_ABS}/lib64/libssl.a
+    ${OPENSSL_INSTALL_DIR_ABS}/lib64/libcrypto.a
 )
 
 target_link_libraries(kernel_network PUBLIC
diff --git a/DesktopEditor/doctrenderer/CMakeLists.txt b/DesktopEditor/doctrenderer/CMakeLists.txt
index 6cee7fd322..473f8c0c6d 100644
--- a/DesktopEditor/doctrenderer/CMakeLists.txt
+++ b/DesktopEditor/doctrenderer/CMakeLists.txt
@@ -292,8 +292,8 @@ if(APPLE)
 endif()
 
 target_link_libraries(doctrenderer PRIVATE
-    ${OPENSSL_INSTALL_DIR_ABS}/lib/libssl.a
-    ${OPENSSL_INSTALL_DIR_ABS}/lib/libcrypto.a
+    ${OPENSSL_INSTALL_DIR_ABS}/lib64/libssl.a
+    ${OPENSSL_INSTALL_DIR_ABS}/lib64/libcrypto.a
 )
 
 target_link_libraries(doctrenderer PUBLIC
diff --git a/DesktopEditor/fontengine/js/CMakeLists.txt b/DesktopEditor/fontengine/js/CMakeLists.txt
index eb723f0db4..84699dff09 100644
--- a/DesktopEditor/fontengine/js/CMakeLists.txt
+++ b/DesktopEditor/fontengine/js/CMakeLists.txt
@@ -43,7 +43,9 @@ set(SOURCES
     ${EO_CORE_3RD_PARTY_WORK_DIR}/brotli/c/dec/bit_reader.c
     ${EO_CORE_3RD_PARTY_WORK_DIR}/brotli/c/dec/decode.c
     ${EO_CORE_3RD_PARTY_WORK_DIR}/brotli/c/dec/huffman.c
+    ${EO_CORE_3RD_PARTY_WORK_DIR}/brotli/c/dec/prefix.c
     ${EO_CORE_3RD_PARTY_WORK_DIR}/brotli/c/dec/state.c
+    ${EO_CORE_3RD_PARTY_WORK_DIR}/brotli/c/dec/static_init.c
 
     ${DESKTOP_ROOT}/freetype-2.10.4/src/base/ftdebug.c
     ${DESKTOP_ROOT}/freetype-2.10.4/src/autofit/autofit.c
diff --git a/DesktopEditor/graphics/cmake/CMakeLists.txt b/DesktopEditor/graphics/cmake/CMakeLists.txt
index c90f24fa65..42d68034fa 100644
--- a/DesktopEditor/graphics/cmake/CMakeLists.txt
+++ b/DesktopEditor/graphics/cmake/CMakeLists.txt
@@ -995,9 +995,9 @@ add_library(graphics SHARED
     ${BROTLI_INSTALL_DIR}/c/dec/bit_reader.c
     ${BROTLI_INSTALL_DIR}/c/dec/decode.c
     ${BROTLI_INSTALL_DIR}/c/dec/huffman.c
-    # ${BROTLI_INSTALL_DIR}/c/dec/prefix.c
+    ${BROTLI_INSTALL_DIR}/c/dec/prefix.c
     ${BROTLI_INSTALL_DIR}/c/dec/state.c
-    # ${BROTLI_INSTALL_DIR}/c/dec/static_init.c
+    ${BROTLI_INSTALL_DIR}/c/dec/static_init.c
 )
 
 set_default_options(graphics)
diff --git a/DesktopEditor/graphics/pro/js/CMakeLists.txt b/DesktopEditor/graphics/pro/js/CMakeLists.txt
index 777be06aa4..3d94a33768 100644
--- a/DesktopEditor/graphics/pro/js/CMakeLists.txt
+++ b/DesktopEditor/graphics/pro/js/CMakeLists.txt
@@ -27,19 +27,15 @@ add_custom_command(
     COMMAND bash ${CORE_ROOT}/Common/3dParty/icu/nc-build.sh
             "${EO_CORE_3RD_PARTY_WORK_DIR}/icu"
             "${EO_CORE_3RD_PARTY_INSTALL_DIR}/icu"
-            74 2 1
+            74 2
 
     COMMAND bash ${CORE_ROOT}/Common/3dParty/openssl/nc-build.sh
             "${EO_CORE_3RD_PARTY_WORK_DIR}/openssl"
             "${EO_CORE_3RD_PARTY_INSTALL_DIR}/openssl"
-            1
 
     COMMAND git -C ${EO_CORE_3RD_PARTY_WORK_DIR}/icu/icu apply
             ${CMAKE_CURRENT_SOURCE_DIR}/wasm/patches/fix-wasm-icu.patch
 
-    COMMAND git -C ${EO_CORE_3RD_PARTY_WORK_DIR}/openssl apply
-            ${CMAKE_CURRENT_SOURCE_DIR}/wasm/patches/fix-wasm-openssl.patch 
-
     COMMAND ${CMAKE_COMMAND} -E touch ${PATCH_STAMP}
 )
 
@@ -949,7 +945,7 @@ _ARM_ALIGN_
 _tcsnicmp=strncmp _lseek=lseek _getcwd=getcwd
 NO_CONSOLE_IO USE_EXTERNAL_JPEG2000 USE_JPIP OPJ_STATIC
 FONT_ENGINE_DISABLE_FILESYSTEM IMAGE_CHECKER_DISABLE_XML
-USE_OPENSSL_HASH DISABLE_FULL_DOCUMENT_CREATION DISABLE_FILESYSTEM
+DISABLE_FULL_DOCUMENT_CREATION DISABLE_FILESYSTEM
 CRYPTOPP_DISABLE_ASM DISABLE_TYPE_MISMATCH
 )
 
diff --git a/DesktopEditor/graphics/pro/js/wasm/patches/fix-wasm-openssl.patch b/DesktopEditor/graphics/pro/js/wasm/patches/fix-wasm-openssl.patch
index 616ed49619..24c8d53d1a 100644
--- a/DesktopEditor/graphics/pro/js/wasm/patches/fix-wasm-openssl.patch
+++ b/DesktopEditor/graphics/pro/js/wasm/patches/fix-wasm-openssl.patch
@@ -1,31 +1,31 @@
 diff --git a/crypto/sha/sha512.c b/crypto/sha/sha512.c
-index ca1f387a..099e80a5 100644
+index 4c3a3b6..f1a44f5 100644
 --- a/crypto/sha/sha512.c
 +++ b/crypto/sha/sha512.c
-@@ -501,7 +501,7 @@ static SHA_LONG64 __fastcall __pull64be(const void *x)
+@@ -583,7 +583,7 @@ static SHA_LONG64 __fastcall __pull64be(const void *x) {
  static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
-                                     size_t num)
+     size_t num)
  {
 -    const SHA_LONG64 *W = in;
-+    const SHA_LONG64 *W = (const SHA_LONG64*)in;
++    const SHA_LONG64 *W = (const SHA_LONG64 *)in;
      SHA_LONG64 A, E, T;
      SHA_LONG64 X[9 + 80], *F;
      int i;
-@@ -563,7 +563,7 @@ static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
+@@ -645,7 +645,7 @@ static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
  static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
-                                     size_t num)
+     size_t num)
  {
 -    const SHA_LONG64 *W = in;
-+    const SHA_LONG64 *W = (const SHA_LONG64*)in;
++    const SHA_LONG64 *W = (const SHA_LONG64 *)in;
      SHA_LONG64 a, b, c, d, e, f, g, h, s0, s1, T1, T2;
      SHA_LONG64 X[16];
      int i;
-@@ -644,7 +644,7 @@ static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
- static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
-                                     size_t num)
+@@ -737,7 +737,7 @@ static void sha512_block_data_order(SHA512_CTX *ctx, const void *in,
+     size_t num)
+ #endif
  {
 -    const SHA_LONG64 *W = in;
-+    const SHA_LONG64 *W = (const SHA_LONG64*)in;
++    const SHA_LONG64 *W = (const SHA_LONG64 *)in;
      SHA_LONG64 a, b, c, d, e, f, g, h, s0, s1, T1;
      SHA_LONG64 X[16];
      int i;
diff --git a/common.cmake b/common.cmake
index 2d46bd303e..a213ebf165 100644
--- a/common.cmake
+++ b/common.cmake
@@ -135,7 +135,24 @@ endfunction()
 function(copy_icu_libs artifact)
     add_custom_command(TARGET ${artifact} POST_BUILD
         COMMAND ${CMAKE_COMMAND} -E make_directory "${EO_CORE_OUTPUT_DIR}"
-        COMMAND /bin/sh -c "cp -P --update=none \"${EO_CORE_3RD_PARTY_INSTALL_DIR}/icu/lib\"/*.so* \"${EO_CORE_OUTPUT_DIR}/\""
+        COMMAND /bin/sh -c "cp -P \"${EO_CORE_3RD_PARTY_INSTALL_DIR}/icu/lib\"/*.so* \"${EO_CORE_OUTPUT_DIR}/\""
         COMMENT "Copying ICU libs to ${EO_CORE_OUTPUT_DIR}"
     )
-endfunction()
\ No newline at end of file
+endfunction()
+
+include(FetchContent)
+FetchContent_Declare(
+    doctest
+    GIT_REPOSITORY https://github.com/doctest/doctest.git
+    GIT_TAG v2.4.11
+)
+FetchContent_MakeAvailable(doctest)
+
+enable_testing()
+
+set_property(GLOBAL PROPERTY TEST_TARGETS "")
+
+# Helper function to add test targets
+function(register_test_target tgt)
+    set_property(GLOBAL APPEND PROPERTY TEST_TARGETS ${tgt})
+endfunction()