Masterarbeit/QuellCode/CentronERP/tests/backend/Centron.Tests.BL/Sales/Receipts/Internal/ReceiptExpressionHelperTest.cs

using System.Linq.Expressions;
using Centron.BusinessLogic.Sales.Receipts.Internal;
using Centron.Data.Entities.Sales.Receipts.DeliveryLists;
using Centron.Interfaces.Sales.Receipts.DeliveryLists;

namespace Centron.Tests.BL.Sales.Receipts.Internal;

public class ReceiptExpressionHelperTest
{
    [Fact]
    public void GetExpression_RewritesArrayContainsForReceiptFilters()
    {
        int[] receiptItemI3Ds = [1, 2];

        Expression<Func<ReceiptDeliveryList, bool>> filter =
            receipt => receipt.Items.Any(item => receiptItemI3Ds.Contains(item.I3D));

        var result = ReceiptExpressionHelper.GetExpression<ReceiptDeliveryList, IReceiptDeliveryList>(filter);

        Assert.NotNull(result);
        Assert.False(ContainsArrayContainsOrImplicitConversion(result));
    }

    private static bool ContainsArrayContainsOrImplicitConversion(Expression expression)
    {
        var visitor = new ArrayContainsOrImplicitConversionFinder();
        visitor.Visit(expression);
        return visitor.Found;
    }

    private sealed class ArrayContainsOrImplicitConversionFinder : ExpressionVisitor
    {
        public bool Found { get; private set; }

        protected override Expression VisitMethodCall(MethodCallExpression node)
        {
            if (node.Method.Name == "op_Implicit")
            {
                Found = true;
                return node;
            }

            if (node.Method.Name == "Contains" && node.Arguments.Count > 0)
            {
                var source = node.Object ?? node.Arguments[0];
                if (source.Type.IsArray)
                    Found = true;
            }

            return base.VisitMethodCall(node);
        }
    }
}