everything ok now ?

.github/workflows/unit_tests.yml

@@ -62,4 +62,12 @@ jobs:
       - name: Publish test report
         uses: mikepenz/action-junit-report@v3
         with:
-          report_paths: 'build/test/junit_*.xml'
+          report_paths: 'build/test/junit_*.xml'
+
+     - name: Install
+        run: cmake --install build --prefix install --config ${{ matrix.config }}
+
+     - name: Use install
+        run: |
+          cmake -B install_build -S test -D CMAKE_BUILD_TYPE=${{ matrix.config }} -D "io1-money_DIR=install/share/io1-money/cmake"
+          cmake --build install_build --config ${{ matrix.config }} --parallel

CMakeLists.txt

@@ -20,7 +20,7 @@ include(GNUInstallDirs)
 add_library(${PROJECT_NAME} INTERFACE include/io1/money.hpp)
 target_include_directories(
   ${PROJECT_NAME}
-  INTERFACE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+  INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
             $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_20)
 
@@ -39,17 +39,29 @@ write_basic_package_version_file(
 
 configure_package_config_file(
   "${PROJECT_SOURCE_DIR}/cmake/config.cmake.in" "${PROJECT_NAME}Config.cmake"
-  INSTALL_DESTINATION ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}/cmake)
+  INSTALL_DESTINATION ${CMAKE_INSTALL_DATADIR}/io1/cmake)
 
 install(
   EXPORT ${PROJECT_NAME}
   NAMESPACE io1::
-  DESTINATION ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}/cmake)
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/io1/cmake)
 
 install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
               "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-        DESTINATION ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}/cmake)
+        DESTINATION ${CMAKE_INSTALL_DATADIR}/io1/cmake)
 
 if(IO1_WITH_TESTS)
-  add_subdirectory(test)
+  include(CTest)
+
+  find_package(doctest CONFIG REQUIRED)
+
+  add_executable(test_${PROJECT_NAME} test/test_money.cpp test/tutorial.cpp)
+  target_link_libraries(test_${PROJECT_NAME} PRIVATE io1::money
+                                                     doctest::doctest)
+
+  add_test(
+    NAME test_${PROJECT_NAME}
+    COMMAND test_${PROJECT_NAME} --reporters=junit
+            --out=junit_test_${PROJECT_NAME}.xml
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 endif()

test/CMakeLists.txt

@@ -1,19 +1,8 @@
 cmake_minimum_required(VERSION 3.25)
 
-project(test_io1-money LANGUAGES CXX)
+project(test_io1-money_install LANGUAGES CXX)
 
-include(CTest)
+find_package(io1_money REQUIRED)
 
-find_package(doctest REQUIRED)
-if (NOT TARGET io1::money)
-  find_package(io1_money REQUIRED)
-endif()
-
-add_executable(${PROJECT_NAME} test/test_money.cpp test/tutorial.cpp)
-target_link_libraries(${PROJECT_NAME} PRIVATE io1::money
-											 doctest::doctest)
-add_test(
-NAME ${PROJECT_NAME}
-COMMAND ${PROJECT_NAME} --reporters=junit
-		--out=junit_${PROJECT_NAME}.xml
-WORKING_DIRECTORY ${PROJECT_BINARY_DIR})
+add_library(${PROJECT_NAME} test_install.cpp)
+target_link_libraries(${PROJECT_NAME} PRIVATE io1::money)

test/test_install.cpp

@@ -0,0 +1,6 @@
+#include "io1/money.hpp"
+
+io1::money add_twice(io1::money const & lhs, io1::money const & rhs) noexcept
+{
+  return lhs + 2 * rhs;
+}