Mix test runs locally, but not in Docker container

martins

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

4 comments

#docker #testing #docker-compose

0 667 4

2024-09-05 05:19:49 UTC

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jarlah

I have found this to work previously

ARG ELIXIR_VERSION=1.14.5
ARG OTP_VERSION=26.0.2
ARG DEBIAN_VERSION=bullseye-20231009-slim

ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"

FROM ${BUILDER_IMAGE} as builder

# .... SNIP ...

FROM ${RUNNER_IMAGE}

# .... SNIP ...

Post #1

martins

Thanks for the suggestion, @jarlah!
Following your advice, I used the Dockerfile generated by mix phx.gen.release --docker.
I added this the the bottom of the Dockerfile:

FROM builder as test
WORKDIR "/app"

ENV MIX_ENV="test"
COPY . .

# install mix dependencies
RUN mix deps.get --only $MIX_ENV
CMD ["mix", "test"]

My docker-compose.yaml looks like this:


version: "3"

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

    build:
      context: .
      dockerfile: Dockerfile

Now I can run my tests in a CI/CD pipeline by simply executing
docker compose up test

Post #2