I noticed that opam install saturn wants to install alcotest and all its dependencies:
=== install 5 packages
✶ alcotest 1.9.0 [required by lockfree]
✶ fmt 0.10.0 [required by alcotest]
✶ lockfree 0.3.1 [required by domainslib]
✶ topkg 1.0.8 [required by fmt, uutf]
✶ uutf 1.0.4 [required by alcotest]
Shouldn't this be marked as with-test?