chore: import upstream snapshot with attribution

tests/fixtures/sample.ex

@@ -0,0 +1,29 @@
+defmodule MyApp.Accounts.User do
+  @moduledoc """
+  Handles user accounts and authentication.
+  """
+
+  alias MyApp.Repo
+  alias MyApp.Schemas.{Account, Token}
+  import Ecto.Query
+
+  defstruct [:id, :name, :email]
+
+  def create(attrs) do
+    %__MODULE__{}
+    |> validate(attrs)
+    |> Repo.insert()
+  end
+
+  def find(id) do
+    Repo.get(__MODULE__, id)
+  end
+
+  defp validate(user, attrs) do
+    if Map.has_key?(attrs, :email) do
+      user
+    else
+      {:error, :missing_email}
+    end
+  end
+end