- added if-clause to check if root project...

- added if-clause to check if root project (https://cliutils.gitlab.io/modern-cmake/chapters/testing.html)
- fixed find_package for Python on Eve, overwriting the found executable by the environment variable, if set

src/CMakeLists.txt

@@ -83,6 +83,6 @@ if (CPP_FLAG)
 	target_compile_options(${LIB_NAME} PUBLIC "-cpp")
 endif()
 
-if(BUILD_TESTING)
+if((CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME OR ${LIB_NAME}_BUILD_TESTING) AND BUILD_TESTING)
   add_subdirectory(./tests)
 endif()

src_python/pre_proc/CMakeLists.txt

@@ -5,8 +5,14 @@ enable_testing()
 find_package(Python3 COMPONENTS Interpreter)
 
 if(PYTHON3_FOUND)
+  # TODO: this is another dirty hack, as CMake has problems detecting the right Python version in lieu of
+  # conda or virtualenv
+  if (DEFINED $ENV{PYTHON})
+    set(Python3_EXECUTABLE $ENV{PYTHON})
+    message(STATUS "Overwriting Python3_EXECUTABLE to " ${Python3_EXECUTABLE} " as set in env var 'PYTHON'")
+  endif()
 	add_test (NAME pytests
-	  COMMAND Python3::Interpreter -m pytest # ${CMAKE_CURRENT_SOURCE_DIR}
+	  COMMAND ${Python3_EXECUTABLE} -m pytest # ${CMAKE_CURRENT_SOURCE_DIR}
 	  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
 	)
 else()