Add unit tests to 2025 day 1

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -3,3 +3,4 @@
 .idea/
 .direnv/
 **/target
+inputs

2025/inputs/01.txt

@@ -1,10 +0,0 @@
-L68
-L30
-R48
-L5
-R60
-L55
-L1
-L99
-R14
-L82

2025/rust/day-01/src/main.rs

@@ -4,15 +4,14 @@ const STARTING_POSITION: i32 = 50;
 const DIAL_RANGE: i32 = 100;
 
 fn main() {
-    let rotations = read_rotations();
+    let rotations = parse_rotations(&fs::read_to_string("../../inputs/01.txt").unwrap());
 
     println!("Password1: {}", count_zero_positions(&rotations));
     println!("Password2: {}", count_zero_clicks(&rotations));
 }
 
-fn read_rotations() -> Vec<i32> {
-    fs::read_to_string("../../inputs/01.txt")
-        .unwrap()
+fn parse_rotations(contents: &str) -> Vec<i32> {
+    contents
         .lines()
         .map(|line| {
             let distance = line[1..].parse::<i32>().unwrap();
@@ -60,3 +59,29 @@ fn count_zero_clicks(rotations: &[i32]) -> i32 {
 
     counter
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const TEST_INPUT: &str = "L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82";
+
+    #[test]
+    fn test_part1() {
+        assert_eq!(count_zero_positions(&parse_rotations(TEST_INPUT)), 3);
+    }
+
+    #[test]
+    fn test_part2() {
+        assert_eq!(count_zero_clicks(&parse_rotations(TEST_INPUT)), 6);
+    }
+}

flake.lock

@@ -1,5 +1,22 @@
 {
   "nodes": {
+    "inputs": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1764611941,
+        "narHash": "sha256-GEVJK9tSeNnGgYYRbjtYE/su75nxRvOm8h0Sf5GD70A=",
+        "ref": "refs/heads/main",
+        "rev": "5390449be22f56739e0840e35e46d54b1166886c",
+        "shallow": true,
+        "type": "git",
+        "url": "ssh://git@github.com/SebastianStork/advent-of-code-inputs.git"
+      },
+      "original": {
+        "shallow": true,
+        "type": "git",
+        "url": "ssh://git@github.com/SebastianStork/advent-of-code-inputs.git"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1764522689,
@@ -18,6 +35,7 @@
     },
     "root": {
       "inputs": {
+        "inputs": "inputs",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
       }

flake.nix

@@ -6,25 +6,42 @@
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    inputs = {
+      url = "git+ssh://git@github.com/SebastianStork/advent-of-code-inputs.git?shallow=1";
+      flake = false;
+    };
   };
 
   outputs =
-    { nixpkgs, rust-overlay, ... }:
+    {
+      nixpkgs,
+      rust-overlay,
+      inputs,
+      ...
+    }:
     let
       system = "x86_64-linux";
       pkgs = nixpkgs.legacyPackages.${system};
     in
     {
       devShells.${system} = {
+        default = pkgs.mkShellNoCC {
+          packages = [ pkgs.stow ];
+          shellHook = ''
+            stow --dir=${inputs} --target=./. package
+          '';
+        };
+
         cpp = pkgs.mkShell.override { stdenv = pkgs.clangStdenv; } {
-          packages = with pkgs; [
-            gdb
-            clang-tools
+          packages = [
+            pkgs.gdb
+            pkgs.clang-tools
           ];
         };
 
         go = pkgs.mkShellNoCC {
-          packages = with pkgs; [ go ];
+          packages = [ pkgs.go ];
         };
 
         rust =