ParkanPlayground/X86DisassemblerTests/InstructionTests/AddEaxImmHandlerTests.cs

using X86Disassembler.X86;
using X86Disassembler.X86.Operands;

namespace X86DisassemblerTests.InstructionTests;

/// <summary>
/// Tests for ADD EAX, imm32 instruction handler
/// </summary>
public class AddEaxImmHandlerTests
{
    /// <summary>
    /// Tests the AddEaxImmHandler for decoding ADD EAX, imm32 instruction
    /// </summary>
    [Fact]
    public void AddEaxImmHandler_DecodesAddEaxImm32_Correctly()
    {
        // Arrange
        // ADD EAX, 0x12345678 (05 78 56 34 12)
        byte[] codeBuffer = new byte[] { 0x05, 0x78, 0x56, 0x34, 0x12 };
        var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
        
        // Act
        var instruction = decoder.DecodeInstruction();
        
        // Assert
        Assert.NotNull(instruction);
        Assert.Equal(InstructionType.Add, instruction.Type);
        
        // Check that we have two operands
        Assert.Equal(2, instruction.StructuredOperands.Count);
        
        // Check the first operand (EAX)
        var eaxOperand = instruction.StructuredOperands[0];
        Assert.IsType<RegisterOperand>(eaxOperand);
        var registerOperand = (RegisterOperand)eaxOperand;
        Assert.Equal(RegisterIndex.A, registerOperand.Register);
        
        // Check the second operand (immediate value)
        var immOperand = instruction.StructuredOperands[1];
        Assert.IsType<ImmediateOperand>(immOperand);
        var immediateOperand = (ImmediateOperand)immOperand;
        Assert.Equal(0x12345678U, immediateOperand.Value);
    }
}