Fixed immediate value formatting in Group1 instruction handlers

X86DisassemblerTests/InstructionTests/IncInstructionTests.cs

@@ -0,0 +1,66 @@
+using X86Disassembler.X86;
+
+namespace X86DisassemblerTests.InstructionTests;
+
+/// <summary>
+/// Tests for INC instruction handlers
+/// </summary>
+public class IncInstructionTests
+{
+    /// <summary>
+    /// Tests the INC EAX instruction (0x40)
+    /// </summary>
+    [Fact]
+    public void TestIncEax()
+    {
+        // Arrange
+        byte[] code = { 0x40 }; // INC EAX
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("inc", instructions[0].Mnemonic);
+        Assert.Equal("eax", instructions[0].Operands);
+    }
+    
+    /// <summary>
+    /// Tests the INC ECX instruction (0x41)
+    /// </summary>
+    [Fact]
+    public void TestIncEcx()
+    {
+        // Arrange
+        byte[] code = { 0x41 }; // INC ECX
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("inc", instructions[0].Mnemonic);
+        Assert.Equal("ecx", instructions[0].Operands);
+    }
+    
+    /// <summary>
+    /// Tests the INC EDI instruction (0x47)
+    /// </summary>
+    [Fact]
+    public void TestIncEdi()
+    {
+        // Arrange
+        byte[] code = { 0x47 }; // INC EDI
+        
+        // Act
+        Disassembler disassembler = new Disassembler(code, 0x1000);
+        var instructions = disassembler.Disassemble();
+        
+        // Assert
+        Assert.Single(instructions);
+        Assert.Equal("inc", instructions[0].Mnemonic);
+        Assert.Equal("edi", instructions[0].Operands);
+    }
+}