Add unit tests for delegate flags in methods (#168)

***NO_CI***

Author: josesimoes

MetadataProcessor.Tests/Core/Tables/nanoMethodDefinitionTableTests.cs

@@ -0,0 +1,79 @@
+//
+// Copyright (c) .NET Foundation and Contributors
+// See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Mono.Cecil;
+
+namespace nanoFramework.Tools.MetadataProcessor.Tests.Core.Tables
+{
+    [TestClass]
+    public class nanoMethodDefinitionTableTests
+    {
+        private TypeDefinition _testDelegatesClassTypeDefinition;
+
+        [TestInitialize]
+        public void Setup()
+        {
+            var nanoTablesContext = TestObjectHelper.GetTestNFAppNanoTablesContext();
+            _testDelegatesClassTypeDefinition = TestObjectHelper.GetTestNFAppTestingDelegatesTypeDefinition(nanoTablesContext.AssemblyDefinition);
+        }
+
+        #region delegate method flags
+
+        [TestMethod]
+        public void TestDelegateInvokeMethodReturnsDelegateInvokeFlag()
+        {
+            var methodDefinition = TestObjectHelper.GetMethodDefinition(_testDelegatesClassTypeDefinition, "SimpleDelegate", "Invoke");
+
+            uint flags = nanoMethodDefinitionTable.GetFlags(methodDefinition);
+
+            // Assert
+            const uint expectedFlag = 0x00020000; // MD_DelegateInvoke
+            Assert.AreEqual(expectedFlag, flags & expectedFlag);
+        }
+
+        [TestMethod]
+        public void TestDelegateConstructorMethodReturnsDelegateConstructorFlag()
+        {
+            var methodDefinition = TestObjectHelper.GetMethodDefinition(_testDelegatesClassTypeDefinition, "SimpleDelegate", ".ctor");
+
+            uint flags = nanoMethodDefinitionTable.GetFlags(methodDefinition);
+
+            // Assert
+            const uint expectedFlag = 0x00010000; // MD_DelegateConstructor
+            Assert.IsTrue((flags & expectedFlag) == expectedFlag, "Expected flag not set for Delegate constructor.");
+        }
+
+        [TestMethod]
+        public void TestDelegateBeginInvokeMethodReturnsDelegateBeginInvokeFlag()
+        {
+            // Arrange
+            var methodDefinition = TestObjectHelper.GetMethodDefinition(_testDelegatesClassTypeDefinition, "SimpleDelegate", "BeginInvoke");
+
+            // Act
+            uint flags = nanoMethodDefinitionTable.GetFlags(methodDefinition);
+
+            // Assert
+            const uint expectedFlag = 0x00040000; // MD_DelegateBeginInvoke
+            Assert.IsTrue((flags & expectedFlag) == expectedFlag, "Expected flag not set for BeginInvoke method.");
+        }
+
+        [TestMethod]
+        public void TestDelegateEndInvokeMethodReturnsDelegateEndInvokeFlag()
+        {
+            // Arrange
+            var methodDefinition = TestObjectHelper.GetMethodDefinition(_testDelegatesClassTypeDefinition, "SimpleDelegate", "EndInvoke");
+
+            // Act
+            uint flags = nanoMethodDefinitionTable.GetFlags(methodDefinition);
+
+            // Assert
+            const uint expectedFlag = 0x00080000; // MD_DelegateEndInvoke
+            Assert.IsTrue((flags & expectedFlag) == expectedFlag, "Expected flag not set for EndInvoke method.");
+        }
+
+        #endregion
+    }
+}

MetadataProcessor.Tests/MetadataProcessor.Tests.csproj

@@ -60,6 +60,7 @@
     <Compile Include="Core\Mono.Cecil\CodeWriterTests.cs" />
     <Compile Include="Core\Tables\nanoAssemblyReferenceTableTests.cs" />
     <Compile Include="Core\Tables\nanoAttributesTableTests.cs" />
+    <Compile Include="Core\Tables\nanoMethodDefinitionTableTests.cs" />
     <Compile Include="Core\Tables\nanoReferenceTableBaseTests.cs" />
     <Compile Include="Core\ClrIntegrationTests.cs" />
     <Compile Include="Core\Utility\DumperTests.cs" />

MetadataProcessor.Tests/TestNFApp/Program.cs

@@ -37,6 +37,10 @@ public static void Main()
             // Reflection Tests
             ReflectionTests();
 
+            ///////////////////////////////////////
+            // Delegate and MulticastDelegate tests
+            _ = new TestingDelegates();
+
             ////////////////////////////////////////////////
             // Test enum in another assembly, same namespace
             var enumTest = new TestEnumInAnotherAssembly();

MetadataProcessor.Tests/TestNFApp/TestNFApp.nfproj

@@ -32,6 +32,7 @@
     <Compile Include="OneClassOverAll.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="TestingDelegates.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\mscorlib\nanoFramework.CoreLibrary\CoreLibrary.nfproj" />

MetadataProcessor.Tests/TestNFApp/TestingDelegates.cs

@@ -0,0 +1,72 @@
+//
+// Copyright (c) .NET Foundation and Contributors
+// See LICENSE file in the project root for full license information.
+//
+
+using System;
+
+namespace TestNFApp
+{
+    public class TestingDelegates
+    {
+        public TestingDelegates()
+        {
+            DelegateTests();
+            MulticastDelegateTests();
+        }
+
+        // Define a delegate
+        public delegate void SimpleDelegate(string message);
+
+        // Method that matches the delegate signature
+        public void DisplayMessage(string message)
+        {
+            Console.WriteLine(message);
+        }
+
+        // Another method that matches the delegate signature
+        public void DisplayUpperCaseMessage(string message)
+        {
+            Console.WriteLine("Uppercase: " + message.ToUpper());
+        }
+
+        // Another method that matches the delegate signature
+        public void DisplayLowerCaseMessage(string message)
+        {
+            Console.WriteLine("Lowercase: " + message.ToLower());
+        }
+
+        private void DelegateTests()
+        {
+            // Instantiate the delegate
+            SimpleDelegate del = new SimpleDelegate(DisplayMessage);
+
+            // Call the delegate
+            del("Hello, this is a delegate example!");
+
+            // Using delegate with anonymous method
+            SimpleDelegate del2 = delegate (string msg)
+            {
+                Console.WriteLine(msg);
+            };
+
+            del2("Hello, this is a delegate example called from an anonymous method!");
+
+            // Using delegate with lambda expression
+            SimpleDelegate del3 = (msg) => Console.WriteLine(msg);
+
+            del3("Hello, this is a delegate example called from a lambda expression!");
+        }
+
+        private void MulticastDelegateTests()
+        {
+            // Instantiate the delegate with multiple methods
+            SimpleDelegate del = DisplayMessage;
+            del += DisplayUpperCaseMessage;
+            del += DisplayLowerCaseMessage;
+
+            // Call the multicast delegate
+            del("Hello, this is a multicast delegate example!");
+        }
+    }
+}

MetadataProcessor.Tests/TestObjectHelper.cs

@@ -375,5 +375,23 @@ public static void AdjustMethodBodyOffsets(Mono.Cecil.Cil.MethodBody methodBody)
             }
         }
 
+        internal static TypeDefinition GetTestNFAppTestingDelegatesTypeDefinition(AssemblyDefinition assemblyDefinition)
+        {
+            TypeDefinition ret = null;
+
+            var module = assemblyDefinition.Modules[0];
+            ret = module.Types.First(i => i.FullName == "TestNFApp.TestingDelegates");
+
+            return ret;
+        }
+
+        internal static MethodDefinition GetMethodDefinition(
+            TypeDefinition typeDefinition,
+            string delegateName,
+            string methodName)
+        {
+            var delegateType = typeDefinition.NestedTypes.First(nt => nt.Name == delegateName);
+            return delegateType.Methods.First(m => m.Name == methodName);
+        }
     }
 }