mix test works but mix test <exunit file name> fails

[ymtszw]

Situation

In mix project, you can mix test to run ExUnit tests that contains calls to Gleam APIs (e.g. :[email protected]), but it fails if you specifically target ExUnit test files with command line arguments.

Reproduction

• Clone this repository
• Install Erlang/Elixir/Gleam as per official doc
• mix archive.install hex mix_gleam
• cd test_projects/basic_project
• mix deps.get
• mix test

Result (Success):

$ mix test
Compiling 1 file (.gleam)
warning: Transitive dependency imported
  ┌─ /Users/yumatsuzawa/workspace/mix_gleam/test_projects/basic_project/_build/test/lib/basic_project/test/basic_project_test.gleam:1:1
  │
1 │ import gleeunit
  │ ^^^^^^^^^^^^^^^
The module gleeunit is being imported, but gleeunit, the package it

belongs to, is not a direct dependency of your package.

In a future version of Gleam this may become a compile error.
Run this command to add it to your dependencies:
gleam add gleeunit

warning: Redundant assertion

┌─ /Users/yumatsuzawa/workspace/mix_gleam/test_projects/basic_project/_build/test/lib/basic_project/test/basic_project_test.gleam:9:7

│

9 │   let assert World = basic_project.hello()

│       ^^^^^^ You can remove this
This assertion is redundant since the pattern covers all possibilities.
warning: Redundant assertion

┌─ /Users/yumatsuzawa/workspace/mix_gleam/test_projects/basic_project/_build/test/lib/basic_project/test/basic_project_test.gleam:13:7

│

13 │   let assert World = hello_elixir()

│       ^^^^^^ You can remove this
This assertion is redundant since the pattern covers all possibilities.
Compiling 2 files (.erl)

Running ExUnit with seed: 5817, max_cases: 16
....

Finished in 0.04 seconds (0.00s async, 0.04s sync)

1 doctest, 3 tests, 0 failures

• mix test test/basic_project_test.exs

Result (Failure):

$ mix test test/basic_project_test.exs 
** (Mix) Unknown dependency test/basic_project_test.exs for environment test

Environments

• OS: macOS Sonoma 14.7
• Erlang: 27.1.1 (installed with mise)
• Elixir: 1.17.3-otp-27 (installed with mise)
• Gleam: 1.6.2 (installed with mise, asdf-community/asdf-gleam)
• mix_gleam: 0.6.2

[ymtszw]

I cannot tell if the root problem lies in mix_gleam, gleam or mix.
Please redirect the issue if someone can point out.