elixir - How can I use IEx.pry without mix -

i know can breakpoint using iex.pry when run application iex -s mix.

i working on elixir exercises not use mix. run using elixir myfile.exs.

how can run file using iex can use iex.pry breakpoints inside application?

edit: here files:

# hello_world.exs defmodule helloworld   @doc """   greets user name, or saying "hello, world!"   if no name given.   """   @spec hello(string.t) :: string.t   def hello(name \\ "world")     "hello, #{name}!"   end end  # hello_world_test.exs if !system.get_env("exercism_test_examples")   code.load_file("hello_world.exs", __dir__) end  exunit.start exunit.configure exclude: :pending, trace: true  defmodule helloworldtest   use exunit.case    test "says hello no name"     assert helloworld.hello() == "hello, world!"   end end 

outputs:

➜  hello-world elixir hello_world_test.exs excluding tags: [:pending]   helloworldtest   * test says hello no name (0.00ms)   finished in 0.03 seconds (0.03s on load, 0.00s on tests) 1 test, 0 failures  randomized seed 530992 

and

➜  hello-world iex hello_world_test.exs erlang/otp 19 [erts-8.3] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]  interactive elixir (1.4.2) - press ctrl+c exit (type h() enter help) iex(1)>