Update the phoenix version and starting migration the project.

test/support/fixtures/accounts_fixtures.ex

@@ -1,50 +0,0 @@
-defmodule LinkShortener.AccountsFixtures do
-  @moduledoc """
-  This module defines test helpers for creating
-  entities via the `LinkShortener.Accounts` context.
-  """
-
-  alias LinkShortener.Accounts
-  alias LinkShortener.Accounts.User
-  alias LinkShortenerWeb.Auth.Guardian
-
-  @doc """
-  Generate a unique user email.
-  """
-  def unique_user_email, do: "user#{System.unique_integer()}@example.com"
-  def valid_user_password, do: "hello world!"
-
-  def valid_user_attributes(attrs \\ %{}) do
-    Enum.into(attrs, %{
-      email: unique_user_email(),
-      password: valid_user_password()
-    })
-  end
-
-  def user_fixture(attrs \\ %{}) do
-    {:ok, user} =
-      attrs
-      |> valid_user_attributes()
-      |> LinkShortener.Accounts.register_user()
-
-    user
-  end
-
-  def user_token_fixture(attrs \\ %{}) do
-    user_params = %{
-      email: "user@mail.com",
-      password: "some password"
-    }
-
-    {:ok, %User{} = user} = Accounts.register_user(user_params)
-    {:ok, token, _claims} = Guardian.encode_and_sign(user)
-
-    token
-  end
-
-  def extract_user_token(fun) do
-    {:ok, captured_email} = fun.(&"[TOKEN]#{&1}[TOKEN]")
-    [_, token | _] = String.split(captured_email.text_body, "[TOKEN]")
-    token
-  end
-end