MoxEnv

It’s your application config but simply mocked with NimbleOwnership like Mox.

Usage

# myapp/lib/myapp/config.ex
defmodule MyApp.Config do
  def get(key, default \\ nil) do
    Application.get_env(:my_app, key, default)
  end
end

# myapp/test/support/config_mock.ex
defmodule MyApp.ConfigMock do
  use MoxEnv, config: MyApp.Config
end

# myapp/lib/myapp.ex
defmodule MyApp do
  @config Application.get_env(:my_app, :config_module, MyApp.Config)

  def test_key do
    @config.get(:test_key)
  end

  def test_key_default do
    @config.get(:test_key_default, :default_value)
  end
end

# config/test.exs
config :my_app, config_module: MyApp.ConfigMock

With that configuration you can simply mock your config in tests, like Mox:

iex> MyApp.test_key
:test_value

iex> MyApp.ConfigMock.put_env(:test_key, :new_value)
:new_value

And import some handy helpers into your test cases:

defmodule MyApp.ConnCase do
  use ExUnit.CaseTemplate

  # ...

  using do
    import Mox
    import MyApp.ConfigMock

    setup [
      :set_mox_from_context,
      :set_env_from_context,
      :verify_on_exit!
    ]
  end

  # ...
end

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request