Test some CMake options.

Author: breyerml

tests/CMakeLists.txt

@@ -309,6 +309,7 @@ if (NOT GTEST_FOUND)
         target_compile_definitions(${target} INTERFACE GTEST_LINKED_AS_SHARED_LIBRARY=1)
     endforeach ()
     target_compile_definitions(${PLSSVM_BASE_TEST_LIBRARY_NAME} PUBLIC GTEST_HAS_MAIN=0)
+    set_target_properties(GTest::gtest_main PROPERTIES EXCLUDE_FROM_ALL ON EXCLUDE_FROM_DEFAULT_BUILD ON)
 endif ()
 
 list(POP_BACK CMAKE_MESSAGE_INDENT)