I'm new to OCaml and Dune, and I'm trying to set up a basic project with test cases. I want my test module to be able to read in text files from a subdirectory and process the input of those files. However, although I'm reading the Dune documentation, I'm having trouble finding the right stanzas to tell Dune to include a directory with no .ml files in it.
When I build my Dune project, it doesn't include the directory where I put my test files.
|-project
|-lib
|-test
|-test_files (* Not included in _build *)
test_input1.txt
test_input2.txt
tests.ml
It seems like a lot of stanzas, like include_subdirs, tell Dune to look for modules, but it appears that Dune will ignore non-module files. Is that what's going on? How do I work around this?
After continuing to scour the documentation, I've gotten this to work. Dune is ultimately trying to build packages, and to designate a non-executable file as belonging to a package, we can use the install stanza.
One things that I didn't realize before poking at the test output was that the order of the stanzas matters. Originally, I had the test stanza before the install stanza, which would fail. I only realized that this might make a difference after noticing that the error output included line numbers.
My final dune file looked like this:
(install
(files
(glob_files test_files/*.txt))
(section share))
(test
(name test_reader)
(libraries typecheck alcotest))
Then, within my OCaml file, I could find the file at test_files/filename.txt.