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## Test a Phoenix application
This example demonstrates the integration of Gitlab CI with Phoenix, elixir and
postgres.
### Add `.gitlab-ci.yml` file to project
The following `.gitlab-ci.yml` should be added in the root of your
repository to trigger CI:
```yaml
image: elixir:1.3.1
services:
- postgres:9.5.3
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`, and other 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`.
**Source**: https://medium.com/@nahtnam/using-phoenix-on-gitlab-ci-5a51eec81142
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