Hi,

I’m able to run my test from my terminal, but if I’m not able to run the tests from within a container.

I get this error when I run docker compose up:

test-1  | Compiling 50 files (.ex)
test-1  | Generated easy_solutions app
test-1  | ** (exit) exited in: GenServer.call(ExUnit.Server, :modules_loaded, :infinity)
test-1  |     ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started
test-1  |     (elixir 1.14.0) lib/gen_server.ex:1027: GenServer.call/3
test-1  |     (ex_unit 1.14.0) lib/ex_unit.ex:376: ExUnit.run/1
test-1  |     (mix 1.14.0) lib/mix/compilers/test.ex:42: Mix.Compilers.Test.require_and_run/4
test-1  |     (mix 1.14.0) lib/mix/tasks/test.ex:543: Mix.Tasks.Test.do_run/3
test-1  |     (mix 1.14.0) lib/mix/task.ex:421: anonymous fn/3 in Mix.Task.run_task/4
test-1  |     (mix 1.14.0) lib/mix/task.ex:475: Mix.Task.run_alias/6
test-1  |     (mix 1.14.0) lib/mix/cli.ex:84: Mix.CLI.run_task/2

I have also tried to replace entrypoint with sleep, so that I can do a docker compose exec test /bin/bash into the container. I can confirm that mix compile works, and I get the same error when I run mix test.

Any suggestions to how I can debug this further?

test.Dockerfile

FROM ubuntu:24.04 

ENV MIX_ENV=test
ENV DOCKER_BUILDKIT=1


USER root
RUN apt update
RUN apt install -y erlang-dev elixir erlang-xmerl  
RUN apt install -y curl git 

RUN useradd -ms /bin/bash appuser
RUN mkdir /app
RUN chown -R appuser /app

USER appuser

COPY . /app
WORKDIR /app


RUN mix local.hex --force
RUN mix local.rebar --force

# install dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get

# compile dependencies
COPY config ./config/


ENTRYPOINT ["mix", "test"]

docker-compose.yaml

version: "3"

services:
  test:
    environment:
      DATABASE_PATH: priv/databases/test.db
      SECRET_KEY_BASE: "l7sdfjkhj"
  

    build:
      context: .
      dockerfile:
        test.Dockerfile
    volumes:
      - ./test_result:/app/test_result