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You should define the module as “solution” and define and export a method named “start” on it, like so:

-module(solution). -export([start/0]). start() -> io:format("Hello, World").
Code language: Erlang (erlang)

If you’d like to write some tests using eunit, you can do so as long as you remember to include_lib and invoke your module’s test function from your start function:

-module(solution). -export([start/0]). -include_lib("eunit/include/eunit.hrl"). % attach eunit handlers to this module f(0) -> 1; f(1) -> 1; f(N) when N > 1 -> f(N-1) + f(N-2). f_test() -> 1 = f(0), 1 = f(1), 2 = f(2), 3 = f(3), 6 = f(4). % this should fail start() -> test(). % remember to call test from start, or we won't know that we need to run tests!
Code language: Erlang (erlang)

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