Added support for string instructions with REP prefix, specifically F3 A5 (REP MOVS)

X86DisassemblerTests/StringInstructionHandlerTests.cs

@@ -0,0 +1,32 @@
+namespace X86DisassemblerTests;
+
+using System;
+using Xunit;
+using X86Disassembler.X86;
+using X86Disassembler.X86.Handlers.String;
+
+/// <summary>
+/// Tests for string instruction handlers
+/// </summary>
+public class StringInstructionHandlerTests
+{
+    /// <summary>
+    /// Tests the RepMovsHandler for decoding REP MOVS instruction
+    /// </summary>
+    [Fact]
+    public void RepMovsHandler_DecodesRepMovs_Correctly()
+    {
+        // Arrange
+        // REP MOVS (F3 A5)
+        byte[] codeBuffer = new byte[] { 0xF3, 0xA5 };
+        var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
+        
+        // Act
+        var instruction = decoder.DecodeInstruction();
+        
+        // Assert
+        Assert.NotNull(instruction);
+        Assert.Equal("rep movs", instruction.Mnemonic);
+        Assert.Equal("dword ptr [edi], dword ptr [esi]", instruction.Operands);
+    }
+}