Testing pow authenticated controllers

Sure, here…

defmodule PontoCaoWeb.EventControllerTest do
  use PontoCaoWeb.ConnCase

  import PontoCao.AnnouncementsFixtures
  import PontoCao.UsersFixtures

  alias PontoCao.Announcements.Event

  @create_attrs %{
    description: "some description of random event",
    title: "some title",
    latitude: "90",
    longitude: "120.5",
    photos: ["https://example.com/", "https://example.com/"],
    frequency: 0,
    input_starts_at: NaiveDateTime.utc_now() |> NaiveDateTime.add(1, :hour),
    input_ends_at: NaiveDateTime.utc_now() |> NaiveDateTime.add(4, :hour),
    timezone: "Etc/UTC"
  }
  @update_attrs %{
    description: "some updated description",
    title: "some updated title",
    latitude: "-90",
    longitude: "-180",
    frequency: 12,
    input_starts_at: NaiveDateTime.utc_now() |> NaiveDateTime.add(1, :hour),
    input_ends_at:
      NaiveDateTime.utc_now() |> NaiveDateTime.add(4, :day) |> NaiveDateTime.add(1, :hour)
  }
  @invalid_attrs %{
    title: nil,
    description: nil,
    latitude: nil,
    longitude: nil,
    photos: nil,
    frequency: nil,
    input_starts_at: nil,
    input_ends_at: nil,
    timezone: nil
  }

  setup %{conn: conn} do
    user = user_fixture()

    authed_conn =
      put_req_header(conn, "accept", "application/json")
      |> Pow.Plug.assign_current_user(user, [])

    {:ok, conn: authed_conn, user: user}
  end

  describe "index" do
    test "lists all events", %{conn: conn} do
      conn = get(conn, ~p"/api/events")
      assert json_response(conn, 200)["data"] == []
    end
  end

  describe "create event" do
    test "renders event when data is valid", %{conn: conn, user: user} do
      conn = post(conn, ~p"/api/events", event: Map.put(@create_attrs, :owner_id, user.id))
      assert %{"id" => id} = json_response(conn, 201)["data"]

      conn =
        conn
        |> Pow.Plug.assign_current_user(user, [])
        |> get(~p"/api/events/#{id}")

      starts_at = NaiveDateTime.utc_now() |> NaiveDateTime.add(1, :hour)
      ends_at = NaiveDateTime.utc_now() |> NaiveDateTime.add(4, :hour)

      assert %{
               "id" => ^id,
               "title" => "some title",
               "description" => "some description of random event",
               "latitude" => "90",
               "longitude" => "120.5",
               "photos" => ["https://example.com/", "https://example.com/"],
               "frequency" => 0,
               "starts_at" => ^starts_at,
               "ends_at" => ^ends_at
             } = json_response(conn, 200)["data"]
    end

    test "renders errors when data is invalid", %{conn: conn} do
      conn = post(conn, ~p"/api/events", event: @invalid_attrs)
      assert json_response(conn, 422)["errors"] != %{}
    end
  end


The index/2 test and the error case in create/2 test passes successfully, but the success case of create/2 gives this error now:

 ** (RuntimeError) expected response with status 200, got: 401, with body:
     "{\"error\":{\"code\":401,\"message\":\"Not authenticated\"}}"
     code: } = json_response(conn, 200)["data"]

So, i guess the error is located at get/3 call in this line:

conn =
  conn
  |> Pow.Plug.assign_current_user(user, [])
  |> get(~p"/api/events/#{id}")

but i still do not understand neither why and what is happening