Tests/RunCMake/Codegen/min-graph-3-build-check.cmake - third_party/github.com/Kitware/CMake - Git at Google

 set(filename "${RunCMake_TEST_BINARY_DIR}/error_lib.c")
 if (NOT EXISTS "${filename}")
   set(RunCMake_TEST_FAILED "expected file NOT created:\n ${filename}")
   return()
 endif()
	set(filename "${RunCMake_TEST_BINARY_DIR}/error_lib.c")
	if (NOT EXISTS "${filename}")
	set(RunCMake_TEST_FAILED "expected file NOT created:\n ${filename}")
	return()
	endif()