testing - Phoenix API : How do I test a POST/create when I don't know the ID of the new resource?

Question

我有一个用于创建用户的 POST/api/v1/users 端点。这是我失败的测试:

test "success" do
  user_params = %{
    user: %{
      email: "eric@spaghetti.com",
      image_url: "https://www.google.com/images/spaghetti",
    }
  }

  conn = build_conn(:post, "/api/v1/users", user_params)
  response = Router.call(conn, @opts)
  assert response.status == 201
  assert Repo.get_by(User, %{email: user_params.user.email})
  assert response.resp_body == %{
    id: "how would I know this??", #<---------this would fail since I have no way of knowing what this value would be
    email: user.email,
    image_url: user.image_url,
  } |> Poison.encode!
end

我的端点返回 3 个字段:email、image_url 和 id。我目前无法让这个测试通过，因为我无法知道新创建的资源的 ID 是什么。有没有更好的方法来测试这个？

Answer 1

在这种情况下，我通常会跳过检查确切的值 id，而只检查它是否存在:

%{email: email, image_url: image_url} = user

assert %{
  "id" => _,
  "email" => ^email,
  "image_url" => ^image_url,
} = Poison.decode!(response.resp_body)

你也可以断言 id 是一个整数:

assert %{
  "id" => id,
  "email" => ^email,
  "image_url" => ^image_url,
} = Poison.decode!(response.resp_body)
assert is_integer(id)