Tests/Module/ExternalData/Data5/Data5Check.cmake - third_party/github.com/Kitware/CMake - Git at Google

 file(STRINGS "${Data5}" lines LIMIT_INPUT 1024)
 if(NOT "x${lines}" STREQUAL "xInput file already transformed.")
   message(SEND_ERROR "Input file:\n  ${Data5}\ndoes not have expected content, but [[${lines}]]")
 endif()
	file(STRINGS "${Data5}" lines LIMIT_INPUT 1024)
	if(NOT "x${lines}" STREQUAL "xInput file already transformed.")
	message(SEND_ERROR "Input file:\n ${Data5}\ndoes not have expected content, but [[${lines}]]")
	endif()