Elixir Test Github Action

This github action will run tests using the official Elixir 1.10 docker container. If the project is an umbrella app, it will cd into all of the apps and run all of the tests in each app, even if the tests in one of the apps fails. This means you will be able to see all of the test failures in one go, avoiding the need for multiple runs.

We:

• Set MIX_ENV=test
• mix deps.get
• mix deps.compile --force
• mix compile --force --warnings-as-errors
• Run mix test.ci

Adding the mix task

NOTE this action runs a mix task called mix test.ci so you need to add that alias in your mix.exs. This allows you to add flags to the test command, or setup the database etc.

  defp aliases do
    [
      ...
      "test.ci": ["test --color --max-cases=10"],
      ...
    ]
end

In an umbrella you should define a command in each app, they can do different things if you wish.

You may also want to set the preferred CLI env for the task alias. When this action runs the mix env is automatically set and so everything is fine, but if you add a mix test.ci command and try to run that locally it will by default be in the :dev env, which is not what you want for test running. So you can either do this: MIX_ENV=test mix test.ci or set this in the project in the mix.exs

def project do
  [
    ...
    preferred_cli_env: ["test.ci": :test],
    ...
  ]
end

Example usage

In a simple library (no database)

Add this to your mix.exs

  defp aliases do
    [
      ...
      "test.ci": ["test --color --max-cases=10"],
      ...
    ]
end

Add a .github/workflows/main.yaml file to the root of the project you want to include it in then inside that you can configure like so:

On the open of a pull request

on: [pull_request]

jobs:
  run_tests:
    runs-on: ubuntu-latest
    steps:
    # This is an action from github that checks out the code in the repo.
    - uses: actions/checkout@v2
    # Give it any name you like
    - name: "run dem tests"
      uses: Adzz/elixir_run_tests_action@v2.0.0

On push

on: [push]

jobs:
  run_tests:
    runs-on: ubuntu-latest
    steps:
    # This is an action from github that checks out the code in the repo.
    - uses: actions/checkout@v2
    # Give it any name you like
    - name: "run dem tests"
      uses: Adzz/elixir_run_tests_action@v2.0.0

App with a database

Add this to the relevant mix.exs

  defp aliases do
    [
      ...
      "test.ci": ["ecto.drop", "ecto.create --quiet", "ecto.migrate", "test"],
      ...
    ]
end

Or if you have a seeds file:

  defp aliases do
    [
      ...
      "test.ci": ["ecto.drop", "ecto.create --quiet", "ecto.migrate", "run priv/repo/seeds.exs", "test"],
      ...
    ]
end

On the open of a pull request

on: [pull_request]

jobs:
  run_tests:
    runs-on: ubuntu-latest
    steps:
    # This is an action from github that checks out the code in the repo.
    - uses: actions/checkout@v2
    # Give it any name you like
    - name: "run dem tests"
      uses: Adzz/elixir_run_tests_action@v2.0.0

On push

on: [push]

jobs:
  run_tests:
    runs-on: ubuntu-latest
    steps:
    # This is an action from github that checks out the code in the repo.
    - uses: actions/checkout@v2
    # Give it any name you like
    - name: "run dem tests"
      uses: Adzz/elixir_run_tests_action@v2.0.0

More info available in the workflow docs