memEx/test/support/data_case.ex
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Elixir

defmodule Memex.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 Memex.DataCase, async: true`, although
this option is not recommended for other databases.
"""
use ExUnit.CaseTemplate
alias Ecto.Adapters.SQL.Sandbox
using do
quote do
alias Memex.Repo
import Ecto
import Ecto.{Changeset, Query}
import Memex.{DataCase, Fixtures}
end
end
setup tags do
pid = Sandbox.start_owner!(Memex.Repo, shared: not tags[:async])
on_exit(fn -> Sandbox.stop_owner(pid) end)
:ok
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 _capture, key ->
opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()
end)
end)
end
@doc """
Generates a random string of any length, default of 12
"""
@spec random_string(length :: non_neg_integer()) :: String.t()
def random_string(length \\ 12) do
:crypto.strong_rand_bytes(length) |> Base.url_encode64() |> binary_part(0, length)
end
def unique_user_email, do: "user#{System.unique_integer()}@example.com"
def valid_user_password, do: "hello world!"
def random_slug(length \\ 20) do
symbols = ~c"0123456789abcdef-"
symbol_count = Enum.count(symbols)
for _ <- Range.new(1, length),
into: "",
do: <<Enum.at(symbols, :rand.uniform(symbol_count - 1))>>
end
end