Fix bugs in testing infrastructure

ICSharpCode.Decompiler.Tests/Helpers/Tester.cs

@@ -322,7 +322,7 @@ namespace ICSharpCode.Decompiler.Tests.Helpers
 
 		public static CSharpDecompiler GetDecompilerForSnippet(string csharpText)
 		{
-			/*var syntaxTree = SyntaxFactory.ParseSyntaxTree(csharpText);
+			var syntaxTree = SyntaxFactory.ParseSyntaxTree(csharpText);
 			var compilation = CSharpCompilation.Create(
 				"TestAssembly",
 				new[] { syntaxTree },
@@ -332,11 +332,11 @@ namespace ICSharpCode.Decompiler.Tests.Helpers
 			var emitResult = compilation.Emit(peStream);
 			peStream.Position = 0;
 
-			var moduleDefinition = ModuleDefinition.ReadModule(peStream);
+			var moduleDefinition = new PEFile("TestAssembly.dll", peStream, PEStreamOptions.Default);
+			moduleDefinition.AssemblyResolver = new UniversalAssemblyResolver(typeof(Tester).Assembly.Location, false, true, moduleDefinition.Reader.DetectTargetFrameworkId(), PEStreamOptions.Default);
 			var decompiler = new CSharpDecompiler(moduleDefinition, new DecompilerSettings());
 
-			return decompiler;*/
-			throw new NotImplementedException();
+			return decompiler;
 		}
 
 		internal static string GetSuffix(CSharpCompilerOptions cscOptions)

ICSharpCode.Decompiler.Tests/RoundtripAssembly.cs

@@ -147,7 +147,7 @@ namespace ICSharpCode.Decompiler.Tests
 						var resolver = new UniversalAssemblyResolver(file, false, true, module.Reader.DetectTargetFrameworkId(), System.Reflection.PortableExecutable.PEStreamOptions.Default);
 						resolver.AddSearchDirectory(inputDir);
 						resolver.RemoveSearchDirectory(".");
-
+						module.AssemblyResolver = resolver;
 						var decompiler = new TestProjectDecompiler(inputDir);
 						// use a fixed GUID so that we can diff the output between different ILSpy runs without spurious changes
 						decompiler.ProjectGuid = Guid.Parse("{127C83E4-4587-4CF9-ADCA-799875F3DFE6}");