first part of day16 un-optimal

day16/day16.test/UnitTestProblem.cs

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+namespace day16.test;
+using FluentAssertions;
+public class UnitTestProblem
+{
+    [Fact]
+    public void TestProblem1()
+    {
+        var problem = new Problem();
+        problem.ResolvePart1("testdata.txt");
+
+        problem.Result1.Should().Be("1651");
+    }
+
+    [Fact]
+    public void TestProblem2()
+    {
+        var problem = new Problem();
+        problem.ResolvePart2("testdata.txt");
+
+        problem.Result2.Should().Be("1707");
+    }
+}

day16/day16.test/Usings.cs

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+global using Xunit;

day16/day16.test/day16.test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../day16/day16.csproj" />
+    <Content Include="testdata.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory> 
+    </Content>
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="6.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <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="3.1.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>

day16/day16.test/testdata.txt

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+Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
+Valve BB has flow rate=13; tunnels lead to valves CC, AA
+Valve CC has flow rate=2; tunnels lead to valves DD, BB
+Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
+Valve EE has flow rate=3; tunnels lead to valves FF, DD
+Valve FF has flow rate=0; tunnels lead to valves EE, GG
+Valve GG has flow rate=0; tunnels lead to valves FF, HH
+Valve HH has flow rate=22; tunnel leads to valve GG
+Valve II has flow rate=0; tunnels lead to valves AA, JJ
+Valve JJ has flow rate=21; tunnel leads to valve II