possible fix

Author: Petr Sramek

PolylineAlgorithm.slnx

@@ -8,7 +8,6 @@
     <Project Path="src/PolylineAlgorithm/PolylineAlgorithm.csproj" />
   </Folder>
   <Folder Name="/tests/">
-    <File Path="tests/Directory.Build.props" />
     <Project Path="tests/PolylineAlgorithm.Tests/PolylineAlgorithm.Tests.csproj" />
   </Folder>
 </Solution>

tests/Directory.Build.props

@@ -1,5 +1,42 @@
-<Project Sdk="MSTest.Sdk/3.8.3">
+<Project Sdk="Microsoft.NET.Sdk">
+	
+	<PropertyGroup>
+		<TargetFramework>net9.0</TargetFramework>
+		<LangVersion>13.0</LangVersion>
+		<Nullable>enable</Nullable>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<InvariantGlobalization>true</InvariantGlobalization>
+	</PropertyGroup>
 
+	<PropertyGroup>
+		<OutputType>Exe</OutputType>
+		<IsTestProject>true</IsTestProject>
+		<EnableMSTestRunner>true</EnableMSTestRunner>
+		<TestingPlatformDotnetTestSupport>true</TestingPlatformDotnetTestSupport>
+		<TestingPlatformShowTestsFailure>true</TestingPlatformShowTestsFailure>
+		<TestingPlatformCaptureOutput>false</TestingPlatformCaptureOutput>
+		<TestingExtensionsProfile>None</TestingExtensionsProfile>
+	</PropertyGroup>
+
+	<PropertyGroup>
+		<IsPackable>false</IsPackable>
+	</PropertyGroup>
+
+	<PropertyGroup>
+		<AnalysisMode>All</AnalysisMode>
+		<AnalysisLevel>latest</AnalysisLevel>
+		<EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
+		<EnableNETAnalyzers>false</EnableNETAnalyzers>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.*" />
+		<PackageReference Include="MSTest" Version="3.*" />
+		<PackageReference Include="Microsoft.Testing.Platform.MSBuild" Version="1.*" />
+		<PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="17.*" />
+		<PackageReference Include="Microsoft.Testing.Extensions.TrxReport" Version="1.*" />
+	</ItemGroup>
+	
 	<ItemGroup>
 		<ProjectReference Include="..\..\src\PolylineAlgorithm\PolylineAlgorithm.csproj" />
 	</ItemGroup>