using Moq;
using Opc.Ua.Client;
using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;

/// <summary>
///     #630 (same pattern) — <c>InitializeAsync</c> on a live driver (no <c>ShutdownAsync</c> first) used to
///     overwrite <c>Session</c> and orphan the previous session + its keep-alive handler.
/// </summary>
[Trait("Category", "Unit")]
public sealed class OpcUaClientReinitializeReleasesSessionTests
{
    /// <summary>A second Initialize disposes the live session before attempting to build a new one.</summary>
    [Fact]
    public async Task Initialize_OnLiveDriver_DisposesThePreviousSession()
    {
        var options = new OpcUaClientDriverOptions { EndpointUrl = "opc.tcp://127.0.0.1:1" };
        using var drv = new OpcUaClientDriver(options, "opcua-reinit");
        var old = new Mock<ISession>();
        drv.SetSessionForTest(old.Object);

        // The new connect is refused (nothing listens on port 1) — what matters is what happened to the old one.
        await Should.ThrowAsync<Exception>(() => drv.InitializeAsync("{}", TestContext.Current.CancellationToken));

        old.Verify(s => s.Dispose(), Times.AtLeastOnce);
        drv.Session.ShouldBeNull();
    }
}