message: In cmake builds, the unit tests need the 'data' directory to be copied.
diff: @@ -58,6 +58,8 @@ endif()
  # All serial non-device unit tests are built into a single executable 'unit_tests'.
  add_executable(unit_tests unit_test_main.cpp ${UNIT_TESTS_SRCS})
  +# Unit tests need the ../../data directory.
  +add_dependencies(unit_tests copy_data)
  target_link_libraries(unit_tests mfem)
  # All device unit tests are built into another executable, in order to be able
  