Fix file locking issue in tests

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -307,6 +307,7 @@
 
   <ItemGroup>
     <Content Include="TestCases\PdbGen\ForLoopTests.xml" />
+    <Content Include="TestCases\PdbGen\CustomPdbId.xml" />
     <Content Include="TestCases\PdbGen\HelloWorld.xml" />
     <Content Include="TestCases\PdbGen\LambdaCapturing.xml" />
   </ItemGroup>

ICSharpCode.Decompiler.Tests/PdbGenerationTestRunner.cs

@@ -51,7 +51,7 @@ namespace ICSharpCode.Decompiler.Tests
 		public void CustomPdbId()
 		{
 			// Generate a PDB for an assembly using a randomly-generated ID, then validate that the PDB uses the specified ID
-			(string peFileName, string pdbFileName) = CompileTestCase(nameof(HelloWorld));
+			(string peFileName, string pdbFileName) = CompileTestCase(nameof(CustomPdbId));
 
 			var moduleDefinition = new PEFile(peFileName);
 			var resolver = new UniversalAssemblyResolver(peFileName, false, moduleDefinition.Metadata.DetectTargetFrameworkId(), null, PEStreamOptions.PrefetchEntireImage);

ICSharpCode.Decompiler.Tests/TestCases/PdbGen/CustomPdbId.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<symbols>
+  <files>
+    <file id="1" name="ICSharpCode.Decompiler.Tests.TestCases.PdbGen\HelloWorld.cs" language="C#" checksumAlgorithm="SHA256"><![CDATA[using System;
+
+namespace ICSharpCode.Decompiler.Tests.TestCases.PdbGen;
+
+public class HelloWorld
+{
+	public static void Main(string[] args)
+	{
+		Console.ReadKey();
+		Console.WriteLine("Hello World!");
+		Console.ReadKey();
+	}
+}
+]]></file>
+  </files>
+</symbols>