C#: Prepare stub generator for unit testing and expose internals to the Test project.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/IRelevantSymbol.cs

@@ -0,0 +1,9 @@
+using Microsoft.CodeAnalysis;
+
+namespace Semmle.Extraction.CSharp.StubGenerator;
+
+internal interface IRelevantSymbol
+{
+    bool IsRelevantNamedType(INamedTypeSymbol symbol);
+    bool IsRelevantNamespace(INamespaceSymbol symbol);
+}

csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/Properties/AssemblyInfo.cs

@@ -0,0 +1,39 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Semmle.Extraction.CSharp.StubGenerator")]
+[assembly: AssemblyDescription("Stub generator for C#")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Semmle.Extraction.CSharp.StubGenerator")]
+[assembly: AssemblyCopyright("Copyright ©  2023")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("6d55ca39-615a-4c1b-a648-a4010995e1ea")]
+
+// Expose internals for testing purposes.
+[assembly: InternalsVisibleTo("Semmle.Extraction.Tests")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/RelevantSymbol.cs

@@ -1,13 +1,10 @@
 using System.Linq;
-
 using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
-
 using Semmle.Util;
 
 namespace Semmle.Extraction.CSharp.StubGenerator;
 
-internal class RelevantSymbol
+internal class RelevantSymbol : IRelevantSymbol
 {
     private readonly IAssemblySymbol assembly;
     private readonly MemoizedFunc<INamedTypeSymbol, bool> isRelevantNamedType;

csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/StubVisitor.cs

@@ -12,9 +12,9 @@ namespace Semmle.Extraction.CSharp.StubGenerator;
 internal sealed class StubVisitor : SymbolVisitor
 {
     private readonly TextWriter stubWriter;
-    private readonly RelevantSymbol relevantSymbol;
+    private readonly IRelevantSymbol relevantSymbol;
 
-    public StubVisitor(TextWriter stubWriter, RelevantSymbol relevantSymbol)
+    public StubVisitor(TextWriter stubWriter, IRelevantSymbol relevantSymbol)
     {
         this.stubWriter = stubWriter;
         this.relevantSymbol = relevantSymbol;