Allow building unit tests against installed lib

test/CMakeLists.txt

@@ -1,22 +1,68 @@
+cmake_minimum_required(VERSION 3.22)
+
+
+######################
+## Project settings ##
+######################
+
+# We support building this as top-level project, e.g. in order to test the lib installation
+project(util_caching_tests
+  LANGUAGES CXX
+)
+
+
+###############
+## C++ setup ##
+###############
+
+# Only do these if this is the main project, and not if it is included through add_subdirectory
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+  # Require C++17
+  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+  # Let's ensure -std=c++xx instead of -std=g++xx
+  set(CMAKE_CXX_EXTENSIONS OFF)
+
+  # Let's nicely support folders in IDEs
+  set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+
+  # Allow clangd and others to properly understand this C++ project
+  set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+  # Testing only available if this is the main project
+  # Note this needs to be done in the main CMakeLists
+  # since it calls enable_testing, which must be in the
+  # main CMakeLists.
+  include(CTest)
+endif()
+
+
 ###################
 ## Find packages ##
 ###################
 
 find_package(GTest)
 
+# Find installed lib and its dependencies, if this is build as top-level project
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+  find_package(util_caching REQUIRED)
+endif()
+
 
 ###########
 ## Build ##
 ###########
 
 if(GTEST_FOUND)
   file(GLOB_RECURSE _tests CONFIGURE_DEPENDS "*.cpp" "*.cc")
+  list(FILTER _tests EXCLUDE REGEX "${CMAKE_CURRENT_BINARY_DIR}")
 
   foreach(_test ${_tests})
     get_filename_component(_test_name ${_test} NAME_WE)
     # make sure we add only one -test to the target
     string(REGEX REPLACE "-test" "" TEST_TARGET_NAME ${_test_name})
-    set(TEST_TARGET_NAME ${PROJECT_NAME}-gtest-${TEST_TARGET_NAME})
+    set(TEST_TARGET_NAME util_caching_tests-gtest-${TEST_TARGET_NAME})
 
     message(STATUS
       "Adding gtest unittest \"${TEST_TARGET_NAME}\" with working dir ${PROJECT_SOURCE_DIR}/${TEST_FOLDER} \n _test: ${_test}"
@@ -26,7 +72,7 @@ if(GTEST_FOUND)
 
     target_link_libraries(${TEST_TARGET_NAME} PUBLIC
       ${GTEST_BOTH_LIBRARIES} pthread
-      ${PROJECT_NAME}
+      util_caching
     )
 
     add_test(NAME ${TEST_TARGET_NAME}