Run like this:
$ iex -S mix
iex> DashboardTest.run
Press enter to stop
1: ~N[2021-06-11 08:44:56]
2: ~N[2021-06-11 08:44:56]
3: ~N[2021-06-11 08:44:56]
4: ~N[2021-06-11 08:44:56]
5: ~N[2021-06-11 08:44:56]
6: ~N[2021-06-11 08:44:56]
7: ~N[2021-06-11 08:44:56]
8: ~N[2021-06-11 08:44:56]
9: ~N[2021-06-11 08:44:56]
10: ~N[2021-06-11 08:44:56]