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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:
```yaml
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:
```elixir
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
- https://medium.com/@nahtnam/using-phoenix-on-gitlab-ci-5a51eec81142
- https://davejlong.com/ci-with-phoenix-and-gitlab/
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