namespace DodoSSH.Client.Terminal.Tests;

/// <summary>
/// The renderer page measures characters with Unicode 11's widths, so an emoji takes the two columns the
/// remote counts for it.
/// </summary>
/// <remarks>
/// What is asserted is that the page asks for the table, and asks before the first frame. Whether xterm then
/// really draws 😀 across two cells is xterm's business, and the fake terminal in the harness is a stub with
/// a memory, not an emulator; <c>docs/manual-checks.md</c> 1.13 is where a person looks at the real one.
/// </remarks>
public sealed class RendererUnicodeTests
{
    [Fact]
    public void APane_LoadsTheUnicode11Addon()
    {
        var page = Opened();

        page.HasUnicode11(7).ShouldBeTrue();
    }

    /// <remarks>
    /// Before open() and not after it: a table chosen once the pane is open leaves whatever it drew first
    /// measured with Unicode 6, which is the drift this exists to stop.
    /// </remarks>
    [Fact]
    public void APane_IsOpenedWithUnicode11WidthsAlreadyActive()
    {
        var page = Opened();

        page.UnicodeAtOpen(7).ShouldBe("11");
    }

    private static RendererPage Opened()
    {
        var page = RendererPage.Load();

        page.Do("accept(0)");
        page.Do("openSession(7)");

        return page;
    }
}