fix CreateDeterministicTestPropsFile and use first PropertyGroup

Author: Bertk

test/coverlet.integration.determisticbuild/coverlet.integration.determisticbuild.csproj

@@ -1,12 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <!-- Import coverlet version-->
   <Import Project="$(MSBuildThisFileDirectory)\DeterministicTest.props" Condition="Exists('$(MSBuildThisFileDirectory)\DeterministicTest.props')" />
-  <!-- Define default values if props file doesn't exist -->
-  <PropertyGroup Condition="!Exists('DeterministicTest.props')">
-    <coverletCollectorsVersion>6.0.4</coverletCollectorsVersion>
-    <coverletMsbuildVersion>6.0.4</coverletMsbuildVersion>
-  </PropertyGroup>
-  
+
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <IsPackable>false</IsPackable>
@@ -19,6 +14,12 @@
     </RestoreSources>
   </PropertyGroup>
 
+  <!-- Define default values if props file doesn't exist -->
+  <PropertyGroup Condition="!Exists('DeterministicTest.props')">
+    <coverletCollectorsVersion>6.0.4</coverletCollectorsVersion>
+    <coverletMsbuildVersion>6.0.4</coverletMsbuildVersion>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(MicrosoftNETTestSdkVersion)" />
     <PackageReference Include="coverlet.msbuild" Version="$(coverletMsbuildVersion)">

test/coverlet.integration.tests/DeterministicBuild.cs

@@ -48,7 +48,7 @@ private void CreateDeterministicTestPropsFile()
                       new XElement("coverletMsbuildVersion", GetPackageVersion("*msbuild*.nupkg")),
                       new XElement("coverletCollectorsVersion", GetPackageVersion("*collector*.nupkg")))));
       _testProjectTfm = XElement.Load(Path.Combine(_testProjectPath, "coverlet.integration.determisticbuild.csproj"))!.
-                       Descendants("PropertyGroup")!.Single().Element("TargetFramework")!.Value;
+                       Descendants("PropertyGroup")!.First().Element("TargetFramework")!.Value;
 
       deterministicTestProps.Save(propsFile);
     }