The argument WORKING_DIRECTORY has been accidentally removed in !1130 (merged). This causes the argument being parsed as one of the MULTI argmuents if following one of these and can break the dune_add_test call.
The way CMAKE_GUARD is handled doesn't cover the usage described in the dune_add_test docs
Add missing documentation for newly parsed arguments
The argument has been accidentally removed in !1130.
This causes the WORKING_DIRECTORY argument being parsed
as one of the MULTI argmuents if following one of these
and can break the dune_add_test call.
