Add AoC 2025 project structure and first solutions

AoC_2025.Tests/AoC_2025.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="coverlet.collector" Version="6.0.2"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0"/>
+        <PackageReference Include="xunit" Version="2.9.2"/>
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <Using Include="Xunit"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\AoC_2025\AoC_2025.csproj" />
+    </ItemGroup>
+
+</Project>

AoC_2025.Tests/Day01Test.cs

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+using AdvenOfCode.Contracts;
+
+namespace AoC_2025.Tests;
+
+public class Day01Test
+{
+    private readonly IPuzzleSolver<int> _sut;
+    private const string TestInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Test\day01.txt";
+    private const string ProdInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Prod\day01.txt";
+    
+    public Day01Test()
+    {
+        _sut = new Day01();
+    }
+    [Fact]
+    public void Part01_Test_equals_3()
+    {
+        var actual = _sut.SolvePart1(TestInputPath);
+        
+        Assert.Equal(3, actual);
+    }
+    
+    [Fact]
+    public void Part01_Prod_equals_1097()
+    {
+        var actual = _sut.SolvePart1(ProdInputPath);
+        
+        Assert.Equal(1097, actual);
+    }
+    
+    [Fact]
+    public void Part02_Test_equals_16()
+    {
+        var actual = _sut.SolvePart2(TestInputPath);
+        
+        Assert.Equal(16, actual);
+    }
+    
+    [Fact]
+    public void Part02_Prod_equals_7101()
+    {
+        var actual = _sut.SolvePart2(ProdInputPath);
+        
+        Assert.Equal(7101, actual);
+    }
+}

AoC_2025.Tests/Day02Test.cs

@@ -0,0 +1,46 @@
+using AdvenOfCode.Contracts;
+
+namespace AoC_2025.Tests;
+
+public class Day02Test
+{
+    private readonly IPuzzleSolver<long> _sut;
+    private const string TestInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Test\day02.txt";
+    private const string ProdInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Prod\day02.txt";
+    
+    public Day02Test()
+    {
+        _sut = new Day02();
+    }
+    [Fact]
+    public void Part01_Test_equals_1227775554()
+    {
+        var actual = _sut.SolvePart1(TestInputPath);
+        
+        Assert.Equal(1227775554, actual);
+    }
+    
+    [Fact]
+    public void Part01_Prod_equals_13919717792()
+    {
+        var actual = _sut.SolvePart1(ProdInputPath);
+        
+        Assert.Equal(13919717792, actual);
+    }
+    
+    [Fact]
+    public void Part02_Test_equals_4174379265()
+    {
+        var actual = _sut.SolvePart2(TestInputPath);
+        
+        Assert.Equal(4174379265, actual);
+    }
+    
+    [Fact]
+    public void Part02_Prod_equals_14582313461()
+    {
+        var actual = _sut.SolvePart2(ProdInputPath);
+        
+        Assert.Equal(14582313461, actual);
+    }
+}

AoC_2025.Tests/Day03Test.cs

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+using AdvenOfCode.Contracts;
+
+namespace AoC_2025.Tests;
+
+public class Day03Test
+{
+    private readonly IPuzzleSolver<long> _sut;
+    private const string TestInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Test\day03.txt";
+    private const string ProdInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Prod\day03.txt";
+    
+    public Day03Test()
+    {
+        _sut = new Day03();
+    }
+    [Fact]
+    public void Part01_Test_equals_357()
+    {
+        var actual = _sut.SolvePart1(TestInputPath);
+        
+        Assert.Equal(357, actual);
+    }
+    
+    [Fact]
+    public void Part01_Prod_equals_16812()
+    {
+        var actual = _sut.SolvePart1(ProdInputPath);
+        
+        Assert.Equal(16812, actual);
+    }
+    
+    [Fact]
+    public void Part02_Test_equals_3121910778619()
+    {
+        var actual = _sut.SolvePart2(TestInputPath);
+        
+        Assert.Equal(3121910778619, actual);
+    }
+    
+    [Fact]
+    public void Part02_Prod_equals_166345822896410()
+    {
+        var actual = _sut.SolvePart2(ProdInputPath);
+        
+        Assert.Equal(166345822896410, actual);
+    }
+}

AoC_2025.Tests/Day04Test.cs

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+using AdvenOfCode.Contracts;
+
+namespace AoC_2025.Tests;
+
+public class Day04Test
+{
+    private readonly IPuzzleSolver<long> _sut;
+    private const string TestInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Test\day04.txt";
+    private const string ProdInputPath = @"C:\Users\p01004051\Documents\AoC-PuzzleInputs\2025\Prod\day04.txt";
+    
+    public Day04Test()
+    {
+        _sut = new Day04();
+    }
+    [Fact]
+    public void Part01_Test_equals_13()
+    {
+        var actual = _sut.SolvePart1(TestInputPath);
+        
+        Assert.Equal(13, actual);
+    }
+    
+    [Fact]
+    public void Part01_Prod_equals_1411()
+    {
+        var actual = _sut.SolvePart1(ProdInputPath);
+        
+        Assert.Equal(1411, actual);
+    }
+    
+    [Fact]
+    public void Part02_Test_equals_43()
+    {
+        var actual = _sut.SolvePart2(TestInputPath);
+        
+        Assert.Equal(43, actual);
+    }
+    
+    [Fact]
+    public void Part02_Prod_equals_8557()
+    {
+        var actual = _sut.SolvePart2(ProdInputPath);
+        
+        Assert.Equal(8557, actual);
+    }
+}