Added support for MOV r/m8, imm8 (0xC6) and ADD r/m32, r32 (0x01) instructions with tests

X86DisassemblerTests/AddRm32R32Tests.cs

@@ -0,0 +1,49 @@
+namespace X86DisassemblerTests;
+
+using System;
+using Xunit;
+using X86Disassembler.X86;
+
+/// <summary>
+/// Tests for ADD r/m32, r32 instruction (0x01)
+/// </summary>
+public class AddRm32R32Tests
+{
+    /// <summary>
+    /// Tests the ADD r32, r32 instruction (0x01) with register operand
+    /// </summary>
+    [Fact]
+    public void TestAddR32R32()
+    {
+        // Arrange
+        byte[] code = { 0x01, 0xC1 }; // ADD ECX, EAX
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("add", instructions[0].Mnemonic);
+        Assert.Equal("ecx, eax", instructions[0].Operands);
+    }
+    
+    /// <summary>
+    /// Tests the ADD m32, r32 instruction (0x01) with memory operand
+    /// </summary>
+    [Fact]
+    public void TestAddM32R32()
+    {
+        // Arrange
+        byte[] code = { 0x01, 0x01 }; // ADD DWORD PTR [ECX], EAX
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("add", instructions[0].Mnemonic);
+        Assert.Equal("dword ptr [ecx], eax", instructions[0].Operands);
+    }
+}