Add unit test project

AdventOfCode.sln

@@ -7,6 +7,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AdventOfCode", "AdventOfCod
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{FBE09BBA-34E4-4DED-94F2-44217330E37F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCodeTests", "AdventOfCodeTests\AdventOfCodeTests.csproj", "{9EC52D75-7380-4E11-94C6-BDF512DD518E}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -29,6 +31,18 @@ Global
 		{6B01383F-FF08-4839-BF44-2DE9071CCC37}.Release|x64.Build.0 = Release|Any CPU
 		{6B01383F-FF08-4839-BF44-2DE9071CCC37}.Release|x86.ActiveCfg = Release|Any CPU
 		{6B01383F-FF08-4839-BF44-2DE9071CCC37}.Release|x86.Build.0 = Release|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Debug|x64.Build.0 = Debug|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Debug|x86.Build.0 = Debug|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Release|x64.ActiveCfg = Release|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Release|x64.Build.0 = Release|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Release|x86.ActiveCfg = Release|Any CPU
+		{9EC52D75-7380-4E11-94C6-BDF512DD518E}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

AdventOfCodeTests/AdventOfCodeTests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+        <RootNamespace>TestProject1</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0"/>
+        <PackageReference Include="xunit" Version="2.4.2"/>
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="coverlet.collector" Version="6.0.0">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+</Project>

AdventOfCodeTests/Day02.cs

@@ -0,0 +1,9 @@
+namespace TestProject1;
+
+public class Day02
+{
+    [Fact]
+    public void Test1()
+    {
+    }
+}

AdventOfCodeTests/GlobalUsings.cs

@@ -0,0 +1 @@
+global using Xunit;