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defmodule WeatherTracker.DataCase do
@moduledoc """
This module defines the setup for tests requiring
access to the application's data layer.
You may define functions here to be used as helpers in
your tests.
Finally, if the test case interacts with the database,
we enable the SQL sandbox, so changes done to the database
are reverted at the end of every test. If you are using
PostgreSQL, you can even run database tests asynchronously
by setting `use WeatherTracker.DataCase, async: true`, although
this option is not recommended for other databases.
use ExUnit.CaseTemplate
using do
quote do
alias WeatherTracker.Repo
import Ecto
import Ecto.Changeset
import Ecto.Query
import WeatherTracker.DataCase
setup tags do
pid = Ecto.Adapters.SQL.Sandbox.start_owner!(WeatherTracker.Repo, shared: not tags[:async])
on_exit(fn -> Ecto.Adapters.SQL.Sandbox.stop_owner(pid) end)
@doc """
A helper that transforms changeset errors into a map of messages.
assert {:error, changeset} = Accounts.create_user(%{password: "short"})
assert "password is too short" in errors_on(changeset).password
assert %{password: ["password is too short"]} = errors_on(changeset)
def errors_on(changeset) do
Ecto.Changeset.traverse_errors(changeset, fn {message, opts} ->
Regex.replace(~r"%{(\w+)}", message, fn _, key ->
opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()