set(ENV_PATH "$ENV{PATH}")
set(ENV_CMAKE_PREFIX_PATH "$ENV{CMAKE_PREFIX_PATH}")

set(ENV{CMAKE_PREFIX_PATH} "")

set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}/PackageRoot")
find_package(Resolved QUIET)

foreach(path "/does_not_exist" "/PackageRoot" "")
  unset(ResolvedA_FOUND CACHE)
  set(ResolvedA_DIR "")
  set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}${path}")
  find_package(ResolvedA QUIET)
  message(STATUS "Resolved_FOUND='${ResolvedA_FOUND}'")
endforeach()

set(CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH OFF)
foreach(path "/does_not_exist" "/PackageRoot" "")
  unset(Resolved_FOUND CACHE)
  set(Resolved_DIR "")
  set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}${path}")
  find_package(ResolvedB QUIET)
  message(STATUS "Resolved_FOUND='${ResolvedB_FOUND}'")
endforeach()

set(CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH ON)
foreach(path "/does_not_exist" "/PackageRoot" "")
  unset(Resolved_FOUND CACHE)
  set(Resolved_DIR "")
  set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}${path}")
  find_package(ResolvedC NO_SYSTEM_ENVIRONMENT_PATH QUIET)
  message(STATUS "Resolved_FOUND='${ResolvedC_FOUND}'")
endforeach()

set(ENV{CMAKE_PREFIX_PATH} "${ENV_CMAKE_PREFIX_PATH}")
set(ENV{PATH} "${ENV_PATH}")