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Test a Phoenix application with GitLab CI/CD

This example demonstrates the integration of Gitlab CI with Phoenix, Elixir and Postgres.

Add .gitlab-ci.yml to project

The following .gitlab-ci.yml should be added in the root of your repository to trigger CI:

image: elixir:1.3

services:
  - postgres:9.6

variables:
  MIX_ENV: "test"

before_script:
  # Setup phoenix dependencies
  - apt-get update
  - apt-get install -y postgresql-client
  - mix local.hex --force
  - mix deps.get --only test
  - mix ecto.reset

test:
  script:
    - mix test

The variables will set the Mix environment to "test". The before_script will install psql, some Phoenix dependencies, and will also run your migrations.

Finally, the test script will run your tests.

Update the Config Settings

In config/test.exs, update the database hostname:

config :my_app, MyApp.Repo,
  hostname: if(System.get_env("CI"), do: "postgres", else: "localhost"),

Add the Migrations Folder

If you do not have any migrations yet, you will need to create an empty .gitkeep file in priv/repo/migrations.

Sources