Redirect stdin from a file in a dune custom test

@ifazk wrote:

I’m trying to write a custom test where I feed some test data to the main executable of my project via standard in. Is there a way to do this?

Here’s what I have so far.

(alias
 (name runtest)
 (deps test_data.txt)
 (action (run dune exec my_proj_exe < test.txt))
)

I don’t think the redirect actually works, since the test hangs. I think < is treated as an argument to dune.

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