How to test elixir application with cron job in local

In my elixir application, I am implementing a cron job with this library Below is my code for the same.

defp deps do
  [{:quantum, "~> 2.2"},
   {:timex, "~> 3.0"}]

defmodule MyApp.Scheduler do
  use Quantum.Scheduler,
    otp_app: :my_app

defmodule MyApp.Application do
  use Application

  def start(_type, _args) do
    import Supervisor.Spec, warn: false

    children = [
      # This is the new line
      worker(MyApp.Scheduler, [])

    opts = [strategy: :one_for_one, name: MyApp.Supervisor]
    Supervisor.start_link(children, opts)

Then i am configuring cron job to print message like this after every 1 min

config :my_app, MyApp.Scheduler,
  jobs: [
    {"* * * * *", fn -> IO.puts("Hello QUANTUM!") end}

How can I test whether cron job is working or not in my local.I tried to use mix run but nothing seems to print the message even after the interval of 1 minute.

My bad, I forgot to include the start up of the Application supervision tree inside the mix file.

  def application do
      extra_applications: [:logger],
      mod: {CnabClient.Application, []}