Added test for INT3 instruction handler

X86DisassemblerTests/Int3InstructionTests.cs

@@ -0,0 +1,30 @@
+namespace X86DisassemblerTests;
+
+using Xunit;
+using X86Disassembler.X86;
+
+/// <summary>
+/// Tests for INT3 instruction handler
+/// </summary>
+public class Int3InstructionTests
+{
+    /// <summary>
+    /// Tests the Int3Handler for decoding INT3 instruction
+    /// </summary>
+    [Fact]
+    public void Int3Handler_DecodesInt3_Correctly()
+    {
+        // Arrange
+        // INT3 (CC)
+        byte[] codeBuffer = new byte[] { 0xCC };
+        var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
+        
+        // Act
+        var instruction = decoder.DecodeInstruction();
+        
+        // Assert
+        Assert.NotNull(instruction);
+        Assert.Equal("int3", instruction.Mnemonic);
+        Assert.Equal("", instruction.Operands);
+    }
+}