[TASK] Day 2, part 1 in Elixir

day2-elixir/test/day2_test.exs

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+defmodule Day2Test do
+  use ExUnit.Case
+  doctest Day2
+
+  test "Part 1 example input" do
+    input_file = File.read("input/day2_example.txt")
+    assert Day2.part1(elem(input_file, 1)) == 1227775554
+  end
+end

day2-elixir/test/test_helper.exs

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+ExUnit.start()