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Stéphane FRACHE
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Added AdventOfCode2025 solution, project, and DayOne
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‎AdventOfCode2025.Tests/AdventOfCode2025.Tests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net10.0</TargetFramework>
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<LangVersion>latest</LangVersion>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" Version="6.0.4" />
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<PackageReference Include="FluentAssertions" Version="8.8.0" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
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<PackageReference Include="Moq" Version="4.20.72" />
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<PackageReference Include="NUnit" Version="4.3.2" />
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<PackageReference Include="NUnit.Analyzers" Version="4.7.0" />
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<PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\AdventOfCode.Elves\AdventOfCode.Elves.csproj" />
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<ProjectReference Include="..\AdventOfCode2025\AdventOfCode2025.csproj" />
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</ItemGroup>
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<ItemGroup>
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<Using Include="NUnit.Framework" />
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</ItemGroup>
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</Project>

‎AdventOfCode2025.Tests/DayOneTests.cs‎

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using AdventOfCode.Elves.IOHelpers;
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using FluentAssertions;
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using Moq;
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace AdventOfCode2025.Tests
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{
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internal class DayOneTests
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{
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[TestCase("R19")]
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[TestCase("R29")]
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[TestCase("R39")]
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[TestCase("R49")]
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public void NoHitRotation_Should_Count_0_Hits(string input)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(new List<string> { input });
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be("Part Two: Number of 0 mid-rotation hits 0");
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}
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[TestCase("R50")]
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public void Going_Up_To_100_Should_Count_1_Hit(string input)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(new List<string> { input });
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be("Part Two: Number of 0 mid-rotation hits 1");
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}
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[TestCase("L50")]
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public void Going_Down_To_0_Should_Count_1_Hit(string input)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(new List<string> { input });
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be("Part Two: Number of 0 mid-rotation hits 1");
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}
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[TestCase("R29,R21")]
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public void Going_Up_To_100_In_Two_Moves_Should_Count_1_Hit(string inputLines)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(inputLines.Split(",").ToList());
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be("Part Two: Number of 0 mid-rotation hits 1");
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}
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[TestCase("L29,L21")]
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public void Going_Down_To_0_In_Two_Moves_Should_Count_1_Hit(string inputLines)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(inputLines.Split(",").ToList());
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be("Part Two: Number of 0 mid-rotation hits 1");
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}
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[TestCase("R1000", 10)]
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[TestCase("R50,R200", 3)]
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[TestCase("L50,L200", 3)]
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public void Passing_0_Multiple_Times_In_One_Move_Should_Count_All_Hits(string inputLines, int hits)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(inputLines.Split(",").ToList());
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be($"Part Two: Number of 0 mid-rotation hits {hits}");
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}
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[TestCase("L68,L30,R48,L5,R60,L55,L1,L99,R14,L82", 6)]
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public void Complex_Cases_Should_Be_Handled_Correctly(string inputLines, int hits)
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{
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Mock<IPuzzleInputHelper> mockInputHelper = new Mock<IPuzzleInputHelper>();
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mockInputHelper.Setup(m => m.GetInputLines(It.IsAny<string>())).Returns(inputLines.Split(",").ToList());
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StringBuilder sb = new();
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StringWriter sw = new StringWriter(sb);
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Console.SetOut(sw);
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DayOne dayOne = new DayOne(mockInputHelper.Object);
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dayOne.PartTwo();
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sb.ToString().Trim().Should().Be($"Part Two: Number of 0 mid-rotation hits {hits}");
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}
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}
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}

‎AdventOfCode2025/AdventOfCode2025.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net10.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\AdventOfCode.Elves\AdventOfCode.Elves.csproj" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="Inputs\" />
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</ItemGroup>
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<ItemGroup>
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<None Update="Inputs\DayOne.txt">
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<CopyToOutputDirectory>Always</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>

‎AdventOfCode2025/AdventOfCode2025.slnx‎

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<Solution>
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<Project Path="../AdventOfCode.Elves/AdventOfCode.Elves.csproj" />
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<Project Path="../AdventOfCode2025.Tests/AdventOfCode2025.Tests.csproj" />
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<Project Path="AdventOfCode2025.csproj" />
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</Solution>

‎AdventOfCode2025/DayOne.cs‎

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using AdventOfCode.Elves.IOHelpers;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using System.Text;
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[assembly: InternalsVisibleToAttribute("AdventOfCode2025.Tests")]
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namespace AdventOfCode2025
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{
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internal class DayOne(IPuzzleInputHelper inputHelper)
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{
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public void PartOne()
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{
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List<String> lines = inputHelper.GetInputLines("DayOne.txt");
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int sum = 50;
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int hits = 0;
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foreach (string line in lines)
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{
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int direction = 1;
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if (line[0] == 'L') direction = -1;
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int value = int.Parse(line.Substring(1));
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sum = value * direction + sum;
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sum %= 100;
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if (sum == 0) hits++;
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}
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Console.WriteLine($"Part One: Number of 0 hits {hits}");
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}
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//7851 too high
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//7371 too high
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//6642 too low
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public void PartTwo()
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{
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List<String> lines = inputHelper.GetInputLines("DayOne.txt");
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int sum = 50;
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int hits = 0;
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bool startedOn0 = false;
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foreach (string line in lines)
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{
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startedOn0 = sum == 0;
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int direction = 1;
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if (line[0] == 'L') direction = -1;
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int value = int.Parse(line.Substring(1));
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while (value >= 100)
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{
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value -= 100;
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hits++;
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}
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if (value == 0) continue;
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sum = value * direction + sum;
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if (sum < 0)
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{
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sum += 100;
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if (!startedOn0)
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{
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hits++;
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}
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}
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else if (sum > 99)
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{
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sum -= 100;
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hits++;
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}
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else if (sum == 0)
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{
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hits++;
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}
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}
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Console.WriteLine($"Part Two: Number of 0 mid-rotation hits {hits}");
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}
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}
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}

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