Add support for TEST instruction

X86Disassembler/X86/ModRMDecoder.cs

@@ -239,4 +239,34 @@ public class ModRMDecoder
             _ => RegisterNames32[index]
         };
     }
+    
+    /// <summary>
+    /// Gets the 8-bit register name based on the register number
+    /// </summary>
+    /// <param name="reg">The register number (0-7)</param>
+    /// <returns>The register name</returns>
+    public static string GetRegister8(int reg)
+    {
+        if (reg >= 0 && reg < RegisterNames8.Length)
+        {
+            return RegisterNames8[reg];
+        }
+        
+        return $"r{reg}?";
+    }
+    
+    /// <summary>
+    /// Gets the 32-bit register name based on the register number
+    /// </summary>
+    /// <param name="reg">The register number (0-7)</param>
+    /// <returns>The register name</returns>
+    public static string GetRegister32(int reg)
+    {
+        if (reg >= 0 && reg < RegisterNames32.Length)
+        {
+            return RegisterNames32[reg];
+        }
+        
+        return $"r{reg}?";
+    }
 }