cmake/Tests/RunCMake/ExternalData/Directory1-stderr.txt

CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
  Data file referenced by argument

    DATA{Directory1}

  corresponds to source tree path

    Directory1

  that is directory instead of a file!
Call Stack \(most recent call first\):
  .*
  Directory1.cmake:3 \(ExternalData_Add_Test\)
  CMakeLists.txt:3 \(include\)