refactor: Move Day 1 tests to dedicated test file and simplify main test suite

fix bug

lib/advent_code2024/solutions/day1/day1.ex

@@ -32,11 +32,14 @@ defmodule AdventCode2024.Solutions.Day1 do
     case File.read(input_file) do
       {:ok, content} ->
         case parse_input(content) do
-          {:error, reason} -> {:error, reason}
-          {left, right} -> 
+          {:error, reason} ->
+            {:error, reason}
+
+          {left, right} ->
             result = calculate_total_distance(left, right)
             {:ok, result}
         end
+
       {:error, reason} ->
         {:error, reason}
     end
@@ -44,8 +47,14 @@ defmodule AdventCode2024.Solutions.Day1 do
 
   defp valid_line?(line) do
     case String.split(line, ~r/\s+/, trim: true) do
-      [left, right] -> match?({:ok, _}, Integer.parse(left)) && match?({:ok, _}, Integer.parse(right))
-      _ -> false
+      [left, right] ->
+        case {Integer.parse(left), Integer.parse(right)} do
+          {{n1, ""}, {n2, ""}} when is_integer(n1) and is_integer(n2) -> true
+          _ -> false
+        end
+
+      _ ->
+        false
     end
   end
 
@@ -66,11 +75,14 @@ defmodule AdventCode2024.Solutions.Day1 do
     case File.read(input_file) do
       {:ok, content} ->
         case parse_input(content) do
-          {:error, reason} -> {:error, reason}
-          {left, right} -> 
+          {:error, reason} ->
+            {:error, reason}
+
+          {left, right} ->
             result = calculate_similarity_score(left, right)
             {:ok, result}
         end
+
       {:error, reason} ->
         {:error, reason}
     end
@@ -79,7 +91,7 @@ defmodule AdventCode2024.Solutions.Day1 do
   @spec parse_input(String.t()) :: number_pair() | {:error, String.t()}
   defp parse_input(content) do
     lines = String.split(content, "\n", trim: true)
-    
+
     if Enum.all?(lines, &valid_line?/1) do
       {left, right} =
         lines

test/advent_code2024/solutions/day1/day1_test.exs

@@ -0,0 +1,33 @@
+defmodule AdventCode2024.Solutions.Day1Test do
+  use ExUnit.Case
+  alias AdventCode2024.Solutions.Day1
+
+  @test_input "test/fixtures/day1/input.txt"
+
+  setup do
+    # Ensure the fixtures directory exists
+    File.mkdir_p!("test/fixtures/day1")
+    
+    # Create test input file
+    test_content = """
+    1 2
+    3 4
+    5 6
+    """
+    File.write!(@test_input, test_content)
+
+    on_exit(fn ->
+      File.rm!(@test_input)
+    end)
+  end
+
+  test "solves day 1 puzzle with test input" do
+    assert {:ok, result} = Day1.solve(@test_input)
+    assert is_integer(result)
+  end
+
+  test "solves day 1 part 2 puzzle with test input" do
+    assert {:ok, result} = Day1.solve_part2(@test_input)
+    assert is_integer(result)
+  end
+end

test/advent_code2024_test.exs

@@ -2,30 +2,8 @@ defmodule AdventCode2024Test do
   use ExUnit.Case
   doctest AdventCode2024
 
-  @test_input "test/fixtures/day1/input.txt"
-
-  setup do
-    # Ensure the fixtures directory exists
-    File.mkdir_p!("test/fixtures/day1")
-    
-    # Create test input file
-    test_content = """
-    1 2
-    3 4
-    5 6
-    """
-    File.write!(@test_input, test_content)
-
-    on_exit(fn ->
-      File.rm!(@test_input)
-    end)
-  end
-
-  test "delegates day1 solutions to Day1 module" do
-    assert {:ok, result} = AdventCode2024.solve_day1(@test_input)
-    assert is_integer(result)
-    
-    assert {:ok, result} = AdventCode2024.solve_day1_part2(@test_input)
-    assert is_integer(result)
+  test "delegates to solution modules" do
+    assert function_exported?(AdventCode2024, :solve_day1, 1)
+    assert function_exported?(AdventCode2024, :solve_day1_part2, 1)
   end
 end