ComplianceNFs/ComplianceNFs.Infrastructure.Tests/MonitorViewModelTests.cs

using System;
using System.Collections.ObjectModel;
using ComplianceNFs.Monitor;
using ComplianceNFs.Core.Entities;
using ComplianceNFs.Core.Application;
using Moq;
using Xunit;

namespace ComplianceNFs.Infrastructure.Tests
{
    public class MonitorViewModelTests
    {
        [Fact]
        public void Constructor_SubscribesToStatusStreamAndPopulatesRecentInvoices()
        {
            // Arrange
            var mockStream = new Mock<IInvoiceStatusStream>();
            var testInvoice = new EnergyInvoice
            {
                MailId = "mailid",
                ConversationId = "convid",
                SupplierEmail = "test@supplier.com",
                ReceivedDate = DateTime.Now,
                InvoiceId = 1,
                Filename = "file.xml",
                Status = InvoiceStatus.Validated
            };
            mockStream.Setup(s => s.GetRecent(It.IsAny<int>())).Returns(new[] { testInvoice });
            var viewModel = new MonitorViewModel(mockStream.Object);

            // Assert
            Assert.Single(viewModel.RecentInvoices);
            Assert.Equal("mailid", viewModel.RecentInvoices[0].MailId);
        }

        [Fact]
        public void StatusUpdated_Event_AddsInvoiceToRecentInvoices()
        {
            // Arrange
            var mockStream = new Mock<IInvoiceStatusStream>();
            mockStream.Setup(s => s.GetRecent(It.IsAny<int>())).Returns(Array.Empty<EnergyInvoice>());
            var viewModel = new MonitorViewModel(mockStream.Object);
            var newInvoice = new EnergyInvoice
            {
                MailId = "newmailid",
                ConversationId = "convid",
                SupplierEmail = "test@supplier.com",
                ReceivedDate = DateTime.Now,
                InvoiceId = 2,
                Filename = "file2.xml",
                Status = InvoiceStatus.Validated
            };

            // Act
            mockStream.Raise(s => s.StatusUpdated += null, newInvoice);

            // Assert
            Assert.Single(viewModel.RecentInvoices);
            Assert.Equal("newmailid", viewModel.RecentInvoices[0].MailId);
        }
    }
}