Cannot run tests in VSCode UI: module Plug.Builder is not loaded

Questions / Help
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1

I have a problem when attempting to run a test inside of the VSCode (i.e. by clicking on a green triangle to the left of the test). The output I get in the debug window:

Started ElixirLS Debug Adapter v0.23.0 ElixirLS Debug Adapter built with elixir "1.17.2" on OTP "27" Running on elixir "1.17.2 (compiled with Erlang/OTP 27)" on OTP "27" Protocols are not consolidated Starting debugger in directory: /home/ought/Coding/Elixir/sample_app Running with MIX_ENV: test MIX_TARGET: host Compiling 23 files (.ex) error: module Plug.Builder is not loaded and could not be found. This may be happening because the module you are trying to load directly or indirectly depends on the current module │ 2 │ use Phoenix.Endpoint, otp_app: :sample_app │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ │ └─ lib/sample_app_web/endpoint.ex:2: SampleAppWeb.Endpoint (module) == Compilation error in file lib/sample_app_web/endpoint.ex == ** (CompileError) lib/sample_app_web/endpoint.ex: cannot compile module SampleAppWeb.Endpoint (errors have been logged) (elixir 1.17.2) expanding macro: Kernel.use/2 lib/sample_app_web/endpoint.ex:2: SampleAppWeb.Endpoint (module) (phoenix 1.7.14) expanding macro: Phoenix.Endpoint.__using__/1 lib/sample_app_web/endpoint.ex:2: SampleAppWeb.Endpoint (module) (elixir 1.17.2) expanding macro: Kernel.use/2

This problem does not happen when I run the tests from the terminal window by mix test - this way tests work normally.
My tasks are the default ones - i.e.:

{ "version": "0.2.0", "configurations": [ { "type": "mix_task", "name": "mix (Default task)", "request": "launch", "projectDir": "${workspaceRoot}" }, { "type": "mix_task", "name": "mix test", "request": "launch", "task": "test", "taskArgs": [ "--trace" ], "startApps": true, "projectDir": "${workspaceRoot}", "requireFiles": [ "test/**/test_helper.exs", "test/**/*_test.exs" ] } ] }

The repository of my simple project is here: https://github.com/StragaSevera/sample_app . The extension that I use is ElixirLS.
Is there any way to make this feature (running tests in IDE) work? It’s a dealbreaker for me =-)

2

Figured it out myself - if somebody else has this problem, what you need to do is clear your project folder from all ide-configuration and build files (like folders _build, .elixir-ls and so on), and then re-open the project. It will start working :slight_smile: