Elixir makes testing really Easy. ExUnit is built into to every mix app.

Let’s run mix test in our app and see what we get.

$ mix test
===> Compiling ranch
===> Compiling cowlib
src/cow_multipart.erl:392: Warning: crypto:rand_bytes/1 is deprecated and will be removed in a future release; use crypto:strong_rand_bytes/1

===> Compiling cowboy
==> mime
Compiling 1 file (.ex)
Generated mime app
==> plug
Compiling 44 files (.ex)
Generated plug app
==> myapp
Compiling 1 file (.ex)
Generated myapp app

Finished in 0.03 seconds
2 tests, 0 failures

Randomized with seed 306366

This command will compile our application and will then run all of our tests.

If we open up the test directory in our application, we can see that ExUnit has generated a smoke test for us, to ensure that our tests are running properly.