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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/let/let_impl.ex
defmodule ESpec.Let.Impl do
@moduledoc """
'let' implementation is here.
"""
@agent_name :espec_let_agent
@doc "This function is used by the let macro to implement lazy evaluation"
def let_eval(module, var) do
case agent_get({self(), module, var}) do
{:todo, module, funcname} ->
shared = agent_get({self(), :shared})
result = apply(module, funcname, [shared])
agent_put({self(), module, var}, {:done, result})
result
{:done, result} ->
result
nil ->
funcname = case var do
:subject -> "subject"
_ -> "let function `#{var}/0`"
end
raise ESpec.LetError, "The #{funcname} is not defined in the current scope!"
end
end
@doc "Starts Agent to save state of 'lets'."
def start_agent, do: Agent.start_link(fn -> Map.new end, name: @agent_name)
@doc "Stops Agent"
def stop_agent, do: Agent.stop(@agent_name)
@doc "Resets stored let value and prepares for evaluation. Called by ExampleRunner."
def run_before(let) do
agent_module = if let.shared, do: let.shared_module, else: let.module
agent_put({self(), agent_module, let.var}, {:todo, let.module, let.function})
end
@doc "Clears all let values for the given module. Called by ExampleRunner."
def clear_lets(module) do
me = self()
Agent.update(@agent_name, fn(map) ->
keys_to_remove = Map.keys(map) |> Enum.filter(&match?({^me, ^module, _}, &1))
Map.drop(map, keys_to_remove)
end)
end
@doc "Updates the shared map that is available to let blocks. Called by ExampleRunner."
def update_shared(shared) do
agent_put({self(), :shared}, shared)
end
defp agent_get(key) do
Agent.get(@agent_name, fn(state) -> Map.get(state, key) end)
end
defp agent_put(key, value), do: Agent.update(@agent_name, &(Map.put(&1, key, value)))
def random_let_name, do: String.to_atom("let_#{ESpec.Support.random_string}")
end