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Write pipeable, fast, and easy-to-read feature tests for your Phoenix apps in a unified way -- regardless of whether you're testing LiveView pages or static pages.

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phoenix_test lib phoenix_test form_payload.ex
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lib/phoenix_test/form_payload.ex 

defmodule PhoenixTest.FormPayload do

  @moduledoc false



  def new(form_data) when is_list(form_data) do

    form_data

    |> deduplicate_preserving_order()

    |> Enum.map_join("&", fn {key, value} ->

      "#{URI.encode_www_form(key)}=#{if(value, do: URI.encode_www_form(value))}"

    end)

    |> Plug.Conn.Query.decode()

  end



  defp deduplicate_preserving_order(form_data) do

    form_data

    |> Enum.reverse()

    |> Enum.uniq()

    |> Enum.reverse()

  end



  def add_form_data(payload, form_data) when is_map(payload) and is_list(form_data) do

    Enum.reduce(form_data, payload, fn {name, value}, acc ->

      with_placeholder = Plug.Conn.Query.decode("#{URI.encode_www_form(name)}=placeholder")

      put_at_placeholder(acc, with_placeholder, value)

    end)

  end



  defp put_at_placeholder(_, "placeholder", value), do: value

  defp put_at_placeholder(list, ["placeholder"], value), do: (list || []) ++ [value]



  defp put_at_placeholder(map, with_placeholder, value) do

    map = map || %{}

    [{key, placeholder_value}] = Map.to_list(with_placeholder)

    Map.put(map, key, put_at_placeholder(map[key], placeholder_value, value))

  end

end