Need help with file structure

I have this project

|-- lib
|   |-- foo
|   |   |-- bar.ml
|   |   |-- bar.mli
|   |   |-- baz.ml
|   |   |-- baz.mli
|   |   |-- dune
|   |-- lib.ml
|   |-- dune
|-- test
|   |-- foo_test
|   |   |-- bar_test.ml
|   |   |-- baz_test.ml
|   |   |-- dune
|   |-- lib_test.ml
|   |-- dune
|-- dune-project

In each of the dune file

; lib/foo/dune
(library
  (name foo))

; lib/dune
(library
  (name lib)
  (public_name lib))

; test/foo_test/dune
(test
  (name foo_test)
  (libraries alcotest foo))

; test/dune
(test
  (name lib_test)
  (libraries alcotest lib))

In the root, I tried to run dune utop lib and I can see the modules

Foo__Bar
Foo.Bar
Foo__Baz
Foo.Baz

I tried to run dune runtest and it says

2 |  (name foo_test)
           ^^^^^^^^^^^^^^^^
Error: Module "Foo_test" doesn't exist.

I then try to create an empty file test/foo_test/foo_test.ml, and do dune runtest, it seems that nothing is happening. I have the Alcotest run function in the test/foo_test/bar_test.ml and test/foo_test/baz_test.ml

I have a few question:

1. Why it says module Foo_test doesn’t exist? I follow the same structure as in lib and it worked in lib
2. Why the test doesn’t run
3. It seems that OCaml project structure is not that intuitive to me (coming from NodeJS), any resources I can read on this?

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