cmake/Tests/RunCMake/file/RENAME-file-replace.cmake

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set(oldname "${CMAKE_CURRENT_BINARY_DIR}/input")
set(newname "${CMAKE_CURRENT_BINARY_DIR}/output")
file(WRITE "${oldname}" "a")
file(WRITE "${newname}" "b")
file(RENAME "${oldname}" "${newname}")
file(READ "${newname}" new)
if(NOT "${new}" STREQUAL "a")
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message(FATAL_ERROR "New name:\n ${newname}\n" "does not contain expected content 'a'.")
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endif()