Undefind function pid/1 - Elixir -


i'm following along old video learning processes. i'm trying send ping i'm getting error test. lib/ping_test.ex:4: undefined function pid/1 i'm not sure i'm doing wrong i'm not familiar elixir yet. here code:

defmodule ping   def start     receive       {:pong, pid} -> send(pid {:ping, self()})     end   end end

test

test "it responds pong ping"   ping = spawn_link(ping, :start, [])   send ping, {:pong, self}   assert_receive {:ping, ping} end

error

lib/ping_test.ex:4: undefined function pid/1

so doing wrong?


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