state.ex

defmodule GherkinTests.State do
  
  def store(state, key, value), do: Map.put(state, key, value)
  
  def retrieve(state, key), do: Map.get(state, key)
  
  def set_if_not_exists(state, key, value) do
    if Map.has_key?(state, key) do
      state
    else
      store(state, key, value)
    end
  end

end