@using Microsoft.AspNetCore.Components.Routing
@inject NavigationManager nav
@implements IDisposable

<h3>Navigation</h3>
<button id="clickable" @onclick=@(() => nav.NavigateTo("/some-path"))></button>

@code {
    IDisposable? _navRegistration;

    protected override void OnInitialized()
    {
        nav.NavigateTo("/original-path");
        _navRegistration = nav.RegisterLocationChangingHandler(LocationChangingHandler);
    }

    private async ValueTask LocationChangingHandler(LocationChangingContext arg)
    {
        arg.PreventNavigation();
    }

    private void UnregisterLocationChangingHandler()
    {
        _navRegistration?.Dispose();
        _navRegistration = null;
    }

    void IDisposable.Dispose()
    {
        UnregisterLocationChangingHandler();
    }
}

@inherits TestContext

@code {

	[Fact]
	public void PreventNavigation()
	{
		// Arrange
		var cut = Render(@<Navigation />);
		var navigationManager = Services.GetRequiredService<NavigationManager>();

		// Assert we're at the starting Uri
		Assert.Equal(new Uri(new(navigationManager.BaseUri), "/original-path").AbsoluteUri, navigationManager.Uri);

		// Act -> click the button to navigate
		var button = cut.Find("#clickable");
		button.Click();

		// Assert the path remains the original path as navigation was prevented
		Assert.Equal(new Uri(new(navigationManager.BaseUri), "/original-path").AbsoluteUri, navigationManager.Uri);
	}
}