CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\):
  Unknown option "Bad/Option" in argument

    DATA{Data.txt,Bad/Option}

Call Stack \(most recent call first\):
  .*
  BadOption1.cmake:2 \(ExternalData_Add_Test\)
  CMakeLists.txt:3 \(include\)