Add start of controller testing

lib/matrix_server_web/api/login.ex

@@ -1,44 +1,31 @@
-# https://gist.github.com/char0n/6fca76e886a2cfbd3aaa05526f287728
 defmodule MatrixServerWeb.API.Login do
   use Ecto.Schema
 
   import Ecto.Changeset
 
-  # TODO: Maybe use inline embedded schema here
-  # https://hexdocs.pm/ecto/Ecto.Schema.html#embeds_one/3
-  defmodule MatrixServerWeb.API.Login.Identifier do
-    use Ecto.Schema
-
-    import Ecto.Changeset
-
-    @primary_key false
-    embedded_schema do
-      field :type, :string
-      field :user, :string
-    end
-
-    def changeset(identifier, params) do
-      identifier
-      |> cast(params, [:type, :user])
-      |> validate_required([:type, :user])
-    end
-  end
-
-  alias MatrixServerWeb.API.Login.Identifier
-
   @primary_key false
   embedded_schema do
     field :type, :string
     field :password, :string
     field :device_id, :string
     field :initial_device_display_name, :string
-    embeds_one :identifier, Identifier
+
+    embeds_one :identifier, Identifier, primary_key: false do
+      field :type, :string
+      field :user, :string
+    end
   end
 
   def changeset(params) do
     %__MODULE__{}
     |> cast(params, [:type, :password, :device_id, :initial_device_display_name])
-    |> cast_embed(:identifier, with: &Identifier.changeset/2, required: true)
+    |> cast_embed(:identifier, with: &identifier_changeset/2, required: true)
     |> validate_required([:type, :password])
   end
+
+  def identifier_changeset(identifier, params) do
+    identifier
+    |> cast(params, [:type, :user])
+    |> validate_required([:type, :user])
+  end
 end