jdescopingtool/NEW/tests/JdeScoping.ConfigManager.Tests/ViewModels/Forms/ConnectionStringsFormViewModelTests.cs

using JdeScoping.ConfigManager.Models;
using JdeScoping.ConfigManager.Services;
using JdeScoping.ConfigManager.ViewModels.Forms;

namespace JdeScoping.ConfigManager.Tests.ViewModels.Forms;

public class ConnectionStringsFormViewModelTests
{
    private readonly IDialogService _dialogService;
    private readonly IConnectionTestService _connectionTestService;

    public ConnectionStringsFormViewModelTests()
    {
        _dialogService = Substitute.For<IDialogService>();
        _connectionTestService = Substitute.For<IConnectionTestService>();
    }

    [Fact]
    public void Constructor_InitializesFromModel()
    {
        // Arrange
        var model = new ConnectionStringsSection
        {
            Entries = new List<ConnectionStringEntry>
            {
                new ConnectionStringEntry
                {
                    Name = "Connection1",
                    Provider = ConnectionProvider.SqlServer,
                    Server = "server1"
                },
                new ConnectionStringEntry
                {
                    Name = "Connection2",
                    Provider = ConnectionProvider.Oracle,
                    Host = "oracle-host"
                }
            }
        };

        // Act
        var sut = new ConnectionStringsFormViewModel(model, () => { }, _dialogService, _connectionTestService);

        // Assert
        sut.Connections.Count.ShouldBe(2);
        sut.Connections[0].Name.ShouldBe("Connection1");
        sut.Connections[0].Provider.ShouldBe(ConnectionProvider.SqlServer);
        sut.Connections[0].Server.ShouldBe("server1");
        sut.Connections[1].Name.ShouldBe("Connection2");
        sut.Connections[1].Provider.ShouldBe(ConnectionProvider.Oracle);
        sut.Connections[1].Host.ShouldBe("oracle-host");
    }

    [Fact]
    public void Constructor_ThrowsOnNullModel()
    {
        // Act & Assert
        Should.Throw<ArgumentNullException>(() =>
            new ConnectionStringsFormViewModel(null!, () => { }, _dialogService, _connectionTestService));
    }

    [Fact]
    public void Constructor_ThrowsOnNullOnChanged()
    {
        // Arrange
        var model = new ConnectionStringsSection();

        // Act & Assert
        Should.Throw<ArgumentNullException>(() =>
            new ConnectionStringsFormViewModel(model, null!, _dialogService, _connectionTestService));
    }

    [Fact]
    public void Constructor_ThrowsOnNullConnectionTestService()
    {
        // Arrange
        var model = new ConnectionStringsSection();

        // Act & Assert
        Should.Throw<ArgumentNullException>(() =>
            new ConnectionStringsFormViewModel(model, () => { }, _dialogService, null!));
    }

    [Fact]
    public void AddConnection_CreatesNewEntryAndSelectsIt()
    {
        // Arrange
        var model = new ConnectionStringsSection();
        var changedInvoked = false;
        var sut = new ConnectionStringsFormViewModel(model, () => changedInvoked = true, _dialogService, _connectionTestService);

        // Act
        sut.AddConnectionCommand.Execute(null);

        // Assert
        sut.Connections.Count.ShouldBe(1);
        sut.Connections[0].Name.ShouldBe("NewConnection");
        sut.SelectedConnection.ShouldBe(sut.Connections[0]);
        model.Entries.Count.ShouldBe(1);
        changedInvoked.ShouldBeTrue();
    }

    [Fact]
    public void HasSelection_IsFalseWhenNothingSelected()
    {
        // Arrange
        var model = new ConnectionStringsSection
        {
            Entries = new List<ConnectionStringEntry>
            {
                new ConnectionStringEntry { Name = "Conn1" }
            }
        };
        var sut = new ConnectionStringsFormViewModel(model, () => { }, _dialogService, _connectionTestService);

        // Assert - no selection by default
        sut.SelectedConnection.ShouldBeNull();
        sut.HasSelection.ShouldBeFalse();
    }

    [Fact]
    public void HasSelection_IsTrueWhenConnectionSelected()
    {
        // Arrange
        var model = new ConnectionStringsSection
        {
            Entries = new List<ConnectionStringEntry>
            {
                new ConnectionStringEntry { Name = "Conn1" }
            }
        };
        var sut = new ConnectionStringsFormViewModel(model, () => { }, _dialogService, _connectionTestService);

        // Act
        sut.SelectedConnection = sut.Connections[0];

        // Assert
        sut.HasSelection.ShouldBeTrue();
    }

    [Fact]
    public void ConnectionCount_ReflectsCollectionSize()
    {
        // Arrange
        var model = new ConnectionStringsSection
        {
            Entries = new List<ConnectionStringEntry>
            {
                new ConnectionStringEntry { Name = "Conn1" },
                new ConnectionStringEntry { Name = "Conn2" },
                new ConnectionStringEntry { Name = "Conn3" }
            }
        };

        // Act
        var sut = new ConnectionStringsFormViewModel(model, () => { }, _dialogService, _connectionTestService);

        // Assert
        sut.ConnectionCount.ShouldBe(3);

        // Act - add another
        sut.AddConnectionCommand.Execute(null);

        // Assert
        sut.ConnectionCount.ShouldBe(4);
    }
}