Hi, during creating my own custom Pow auth I stuck during testing. I made a research on web but couldnt find solution.
For learning purpose I show token in json. I need it to paste in postman during manual testing (i dont know yet how to use postman with session/cookies auth 
)
@spec reset_password(Conn.t(), map()) :: Conn.t()
def reset_password(conn, %{"id" => token, "user" => user_params}) do
with {:ok, conn} <- PowResetPassword.Plug.load_user_by_token(conn, token),
{:ok, _user, conn} <- PowResetPassword.Plug.update_user_password(conn, user_params) do
json(conn, %{status: "Password changed"})
else
{:error, _changeset, conn} ->
json(conn, %{error: %{message: "Passwords are not the same"}})
_ ->
json(conn, %{error: %{message: "Expired Token"}})
end
end
Function works well, shows expected errors while providing invalid params or token. I wanted to write tests for it and then I stuck. I cant go through them and my every try is failed.
I setup up user before tests:
setup do
user =
%User{}
|> User.changeset(%{email: "test@example.com", password: @password, password_confirmation: @password})
|> Repo.insert!()
{:ok, user: user}
end
First attemp:
@valid_params %{"id" => "token", "user" => %{"password" => @new_password, "password_confirmation" => @new_password}}
describe "reset_password/2" do
test "with valid token and passwords", %{conn: conn} do
conn = post(conn, Routes.password_path(conn, :reset_password, @valid_params))
assert json = json_response(conn, 200)
assert json["status"]
end
end
Error in terminal:
Expected truthy, got nil
code: assert json["status"]
arguments:
# 1
%{"error" => %{"message" => "Expired Token"}}
# 2
"status"
I suppose that it needs real token, not any hard coded pretending to be real.
Second attemp:
use PowApiTemplateWeb.ConnCase
alias Plug.Conn
alias PowApiTemplate.{Repo, Users.User}
alias PowResetPassword.Plug
alias Pow.Plug, as: PowPlug
describe "reset_password/2" do
setup %{conn: conn} do
token = PowResetPassword.Plug.create_reset_token(conn, "test@example.com")
{:ok, conn: conn, token: token}
end
test "with valid token and passwords", %{conn: conn} do
conn = post(conn, Routes.password_path(conn, :reset_password, @valid_params))
assert json = json_response(conn, 200)
assert json["status"]
end
end
It seems to be working. I use real conn, use function providing token, but there appears an error i couldn’t resolve even if I checked for solutions, check if I write in config everything like it is written in docs:
(Pow.Config.ConfigError) Pow configuration not found in connection. Please use a Pow plug that puts the Pow configuration in the plug connection.
I tried also different way of writing this func but Pow config errors still appears. I dont think my function in untestable, but there are issues I can resolve after digging in docs:
describe "reset_password/2" do
test "with valid token and passwords", %{conn: conn} do
token = PowResetPassword.Plug.create_reset_token(conn, "test@example.com")
conn = post(conn, Routes.password_path(conn, :reset_password, %{"id" => token, "user" => %{"password" => @new_password, "password_confirmation" => @new_password}}))
assert json = json_response(conn, 200)
assert json["status"]
end
end
Thanks for any help 
