Error with Mix compile and recompile command

Sorry i can’t upload picture about this problem because i’m new user. And i’m using VMware so i can’t copy and paste for here. But i can explain:

command: elixir -v
Erlang/OTP 24 [erts-12.2.1] [source] [64-bit] [smp:2:2] [ds:e:e:10] [async-threads:1] [jit]

Elixir 1.12.2 (compiled with ErlangOTP 24)

command: mix compile
command: mix compile --force
Compiling 1 file (.ex)
Generated fizz_buzz app

But when i try a test or when i call a print after compile with --force, i can’t see the new changes to my code!

So i don’t understand what’s happend. If i do all code and compile just in the end, its ok, but i can´t wrong because i can´t test during the programmation.