To support my own rant about making our libraries test-friendly (based on finitomata example), I implemented the test scaffold generation, based on the FSM shape, collected during the compile time.
mix finitomata.generate.test --module MyApp.FSM
The above would generate a scaffold for checking all the possible paths in the FSM declaration. Enjoy.
https://hexdocs.pm/finitomata/Finitomata.ExUnit.html#module-test-scaffold-generation
