message: enable_testing only if JSON_BuildTests is ON
diff: @@ -3,8 +3,6 @@ cmake_minimum_required(VERSION 3.0)
  # define the project
  project(nlohmann_json VERSION 2.1.1 LANGUAGES CXX)
  -enable_testing()
  -
  option(JSON_BuildTests "Build the unit tests" ON)
  # define project variables
  @@ -26,6 +24,7 @@ target_include_directories(${JSON_TARGET_NAME} INTERFACE
  # create and configure the unit test target
  if(JSON_BuildTests)
  + enable_testing()
  add_subdirectory(test)
  endif()
  