Starting up a MySupervisor process and verifying that is has linked to child processes

starting_my_supervisor.iex

# Start a supervisor with two child specifications
iex(1)> {:ok, pid} = MySupervisor.start_link([{Parser, :start_link, []}, {Parser, :start_link, []}])
{:ok, #PID<0.123.0>}

# See the two processes that the supervisor started
iex(2)> MySupervisor.list_processes(pid)
%{#PID<0.124.0> => {Parser, :start_link, []},
  #PID<0.125.0> => {Parser, :start_link, []}}
  
# Verify the supervisor has linked to the processes
iex(3)> Process.info(pid, :links)
{:links, [#PID<0.124.0>, #PID<0.125.0>, #PID<0.121.0>]}