长生不老药凤凰：控制器测试中奇怪的"no function clause matching"错误

Question

我对控制器的测试失败了，我无法找出这个错误的根源。我尝试了我能想到的一切，但有点无助，因为错误消息很一般。

有问题的错误消息（运行测试时）。

1) test does not create resource and renders errors when data is invalid (MyApp.AdminControllerTest)
   test/controllers/admin_controller_test.exs:21
   ** (FunctionClauseError) no function clause matching in MyApp.AdminControllerTest.__ex_unit_setup_1/1
   stacktrace:
     test/controllers/admin_controller_test.exs:8: MyApp.AdminControllerTest.__ex_unit_setup_1(%{async: false, case: MyApp.AdminControllerTest, file: "~/MyApp/test/controllers/admin_controller_test.exs", line: 21, test: :"test does not create resource and renders errors when data is invalid"})
     test/controllers/admin_controller_test.exs:1: MyApp.AdminControllerTest.__ex_unit__/2

2) test creates and renders resource when data is valid (MyApp.AdminControllerTest)
   test/controllers/admin_controller_test.exs:12
   ** (FunctionClauseError) no function clause matching in MyApp.AdminControllerTest.__ex_unit_setup_1/1
   stacktrace:
     test/controllers/admin_controller_test.exs:8: MyApp.AdminControllerTest.__ex_unit_setup_1(%{async: false, case: MyApp.AdminControllerTest, file: "~/MyApp/test/controllers/admin_controller_test.exs", line: 12, test: :"test creates and renders resource when data is valid"})
     test/controllers/admin_controller_test.exs:1: MyApp.AdminControllerTest.__ex_unit__/2

我的代码：

admin_controller_test.exs

defmodule MyApp.AdminControllerTest do
  use MyApp.ConnCase
  alias MyApp.Admin
  @valid_attrs %{email: "[e-mail]", password: "s3cr3t"}
  @invalid_attrs %{}
  setup %{conn: conn} do
    {:ok, conn: put_req_header(conn, "accept", "application/json")}
  end
  test "creates and renders resource when data is valid", %{conn: conn} do
    conn = post conn, admin_path(conn, :create), admin: @valid_attrs
    body = json_response(conn, 201)
    assert body["data"]["id"]
    assert body["data"]["email"]
    refute body["data"]["password"]
    assert Repo.get_by(Admin, email: "[e-mail]")
  end
  test "does not create resource and renders errors when data is invalid", %{conn: conn} do
    conn = post conn, admin_path(conn, :create), admin: @invalid_attrs
    assert json_response(conn, 422)["errors"] != %{}
  end
end

admin_controller.ex

defmodule MyApp.AdminController do
  use MyApp.Web, :controller
  alias MyApp.Admin
  plug :scrub_params, "admin" when action in [:create]
  def create(conn, %{"admin" => admin_params}) do
    changeset = Admin.registration_changeset(%Admin{}, admin_params)
    case Repo.insert(changeset) do
      {:ok, admin} ->
        conn
        |> put_status(:created)
        |> render("show.json", admin: admin)
      {:error, changeset} ->
        conn
        |> put_status(:unprocessable_entity)
        |> render(MyApp.ChangesetView, "error.json", changeset: changeset)
    end
  end
end

最后是我的部分路线。ex

defmodule MyApp.Router do
  # [...]
  pipeline :api do
    plug :accepts, ["json"]
  end
  scope "/api/v1", MyApp do
    pipe_through :api
    resources "/admins", AdminController, only: [:create]
  end
  # [...]
end

非常感谢您的帮助！感谢

Answer 1

错误来自：

setup %{conn: conn} do

将其更改为：

setup do