test: Add tests for Day 1 Historian Hysteria challenge

test/advent_code2024_test.exs

@@ -2,7 +2,20 @@ defmodule AdventCode2024Test do
   use ExUnit.Case
   doctest AdventCode2024
 
-  test "greets the world" do
+  describe "Day 1: Historian Hysteria" do
-    assert AdventCode2024.hello() == :world
+    test "calculates total distance between two lists using example input" do
+      left_list = [3, 4, 2, 1, 3, 3]
+      right_list = [4, 3, 5, 3, 9, 3]
+      
+      assert AdventCode2024.calculate_total_distance(left_list, right_list) == 11
+    end
+
+    test "handles empty lists" do
+      assert AdventCode2024.calculate_total_distance([], []) == 0
+    end
+
+    test "handles single element lists" do
+      assert AdventCode2024.calculate_total_distance([1], [3]) == 2
+    end
   end
 end