An import reads the directory at build time, so a package that dune has not copied under the test's build dir does not resolve — and the failure is a missing collection, not a missing file, which reads like a bug in Load.
An import reads the directory at build time, so a package that dune has not copied under the test's build dir does not resolve — and the failure is a missing collection, not a missing file, which reads like a bug in Load.