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

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

namespace JdeScoping.ConfigManager.Tests.ViewModels.Forms;

public class ExcelExportFormViewModelTests
{
    [Fact]
    public void Constructor_InitializesFromModel()
    {
        // Arrange
        var model = new ExcelExportSection
        {
            MaxRowsPerSheet = 500000,
            DefaultDateFormat = "MM/dd/yyyy",
            DebugWriteToFile = true,
            DebugOutputDirectory = "/tmp/debug",
            TimezoneId = "America/Los_Angeles"
        };

        // Act
        var sut = new ExcelExportFormViewModel(model, () => { });

        // Assert
        sut.MaxRowsPerSheet.ShouldBe(500000);
        sut.DefaultDateFormat.ShouldBe("MM/dd/yyyy");
        sut.DebugWriteToFile.ShouldBeTrue();
        sut.DebugOutputDirectory.ShouldBe("/tmp/debug");
        sut.SelectedTimezone.ShouldBe("America/Los_Angeles");
    }

    [Fact]
    public void Constructor_UsesModelTimezone()
    {
        // Arrange - model defaults to "America/Chicago"
        var model = new ExcelExportSection();

        // Act
        var sut = new ExcelExportFormViewModel(model, () => { });

        // Assert
        sut.SelectedTimezone.ShouldBe("America/Chicago");
    }

    [Fact]
    public void AvailableTimezones_ContainsSystemTimezones()
    {
        // Act & Assert
        ExcelExportFormViewModel.AvailableTimezones.ShouldNotBeEmpty();
        // Check for common IANA timezones
        ExcelExportFormViewModel.AvailableTimezones.ShouldContain("America/Chicago");
        ExcelExportFormViewModel.AvailableTimezones.ShouldContain("UTC");
    }

    [Fact]
    public void PropertyChange_UpdatesModel()
    {
        // Arrange
        var model = new ExcelExportSection { MaxRowsPerSheet = 1000000 };
        var sut = new ExcelExportFormViewModel(model, () => { });

        // Act
        sut.MaxRowsPerSheet = 750000;

        // Assert
        model.MaxRowsPerSheet.ShouldBe(750000);
    }

    [Fact]
    public void SelectedTimezone_UpdatesModelTimezoneId()
    {
        // Arrange - model defaults to "America/Chicago"
        var model = new ExcelExportSection();
        var sut = new ExcelExportFormViewModel(model, () => { });

        // Act - change to a different timezone
        sut.SelectedTimezone = "America/New_York";

        // Assert
        model.TimezoneId.ShouldBe("America/New_York");
    }

    [Fact]
    public void PropertyChange_InvokesOnChanged()
    {
        // Arrange
        var model = new ExcelExportSection(); // Default TimezoneId is "America/Chicago"
        var changedInvoked = false;
        var sut = new ExcelExportFormViewModel(model, () => changedInvoked = true);

        // Act - change to a different timezone than the default
        sut.SelectedTimezone = "America/Denver";

        // Assert
        changedInvoked.ShouldBeTrue();
    }

    [Fact]
    public void PropertyChange_RaisesPropertyChanged()
    {
        // Arrange
        var model = new ExcelExportSection();
        var sut = new ExcelExportFormViewModel(model, () => { });
        var propertyChangedRaised = false;
        sut.PropertyChanged += (s, e) =>
        {
            if (e.PropertyName == nameof(ExcelExportFormViewModel.DefaultDateFormat))
                propertyChangedRaised = true;
        };

        // Act
        sut.DefaultDateFormat = "dd-MMM-yyyy";

        // Assert
        propertyChangedRaised.ShouldBeTrue();
    }

    [Fact]
    public void SameValueAssignment_DoesNotInvokeOnChanged()
    {
        // Arrange
        var model = new ExcelExportSection { DebugWriteToFile = true };
        var changedInvoked = false;
        var sut = new ExcelExportFormViewModel(model, () => changedInvoked = true);

        // Act
        sut.DebugWriteToFile = true; // Same value

        // Assert
        changedInvoked.ShouldBeFalse();
    }

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

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

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