Facebook.test_users

You're seeing just the function test_users, go back to Facebook module for more information.
Link to this function

test_users(client_id, access_token)

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Specs

test_users(client_id(), access_token()) :: resp()

Get all test users for an app.

The access token in this case needs to be an app access token. See:

Examples

iex> Facebook.test_users("appId", "appId|appSecret")
{:ok, %{"data" => [
  %{
    "access_token" => "ACCESS_TOKEN",
    "id" => "USER_ID",
    "login_url" => "https://developers.facebook.com/checkpoint/test-user-login/USER_ID/"
  }
]}