1 files changed, 275 insertions, 0 deletions
diff --git a/tests/Jellyfin.Providers.Tests/Tmdb/TmdbMissingEpisodeProviderTests.cs b/tests/Jellyfin.Providers.Tests/Tmdb/TmdbMissingEpisodeProviderTests.cs
new file mode 100644
index 0000000000..7813013c05
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+++ b/tests/Jellyfin.Providers.Tests/Tmdb/TmdbMissingEpisodeProviderTests.cs
@@ -0,0 +1,275 @@
+using System;
+using MediaBrowser.Controller.Entities.TV;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Providers.Plugins.Tmdb.TV;
+using TMDbLib.Objects.Search;
+using Xunit;
+
+namespace Jellyfin.Providers.Tests.Tmdb;
+
+public class TmdbMissingEpisodeProviderTests
+{
+    private static readonly DateTime _today = new(2026, 6, 20, 0, 0, 0, DateTimeKind.Utc);
+
+    [Theory]
+    // No air date -> never imported, regardless of options.
+    [InlineData(null, true, true, false, false, false)]
+    [InlineData(null, false, false, false, false, false)]
+    // Future (unaired) episodes are gated by the unaired option.
+    [InlineData(5, true, false, false, false, true)]
+    [InlineData(5, false, false, false, false, false)]
+    [InlineData(5, false, true, false, false, false)]
+    // Today counts as unaired.
+    [InlineData(0, true, false, false, false, true)]
+    [InlineData(0, false, false, false, false, false)]
+    // Past (already aired) episodes are gated by the missing option.
+    [InlineData(-5, false, true, false, false, true)]
+    [InlineData(-5, false, false, false, false, false)]
+    [InlineData(-5, true, false, false, false, false)]
+    // Specials are never imported when the specials option is off, regardless of air date.
+    [InlineData(5, true, false, true, false, false)]
+    [InlineData(-5, false, true, true, false, false)]
+    // Specials follow the normal air-date gating when the specials option is on.
+    [InlineData(5, true, false, true, true, true)]
+    [InlineData(5, false, false, true, true, false)]
+    [InlineData(-5, false, true, true, true, true)]
+    [InlineData(-5, false, false, true, true, false)]
+    public void ShouldImportEpisode_RespectsAirDateAndOptions(int? dayOffset, bool importUnaired, bool importMissing, bool isSpecial, bool importSpecials, bool expected)
+    {
+        DateTime? premiere = dayOffset.HasValue ? _today.AddDays(dayOffset.Value) : null;
+
+        Assert.Equal(expected, TmdbMissingEpisodeProvider.ShouldImportEpisode(premiere, _today, importUnaired, importMissing, isSpecial, importSpecials));
+    }
+
+    [Fact]
+    public void ShouldPrune_AgedOutVirtualTmdbEpisode_ReturnsTrue()
+    {
+        var episode = VirtualEpisode(_today.AddDays(-1), withTmdbId: true);
+
+        Assert.True(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 0, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_NotInPruningMode_ReturnsFalse()
+    {
+        var episode = VirtualEpisode(_today.AddDays(-1), withTmdbId: true);
+
+        Assert.False(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: false, _today, gracePeriodDays: 0, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_StillUpcoming_ReturnsFalse()
+    {
+        var episode = VirtualEpisode(_today.AddDays(1), withTmdbId: true);
+
+        Assert.False(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 0, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_VirtualEpisodeFromAnotherProvider_ReturnsFalse()
+    {
+        // No TMDb id -> not created by this provider (e.g. a TheTVDB plugin entry) -> left untouched.
+        var episode = VirtualEpisode(_today.AddDays(-1), withTmdbId: false);
+
+        Assert.False(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 0, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_PhysicalEpisode_ReturnsFalse()
+    {
+        var episode = new Episode { Path = "/media/show/Season 01/s01e01.mkv", PremiereDate = _today.AddDays(-1) };
+        episode.SetProviderId(MetadataProvider.Tmdb, "123");
+
+        Assert.False(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 0, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_AiredWithinGracePeriod_ReturnsFalse()
+    {
+        // Aired two days ago but the grace period keeps it around for the file to be added.
+        var episode = VirtualEpisode(_today.AddDays(-2), withTmdbId: true);
+
+        Assert.False(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 7, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_AiredBeyondGracePeriod_ReturnsTrue()
+    {
+        var episode = VirtualEpisode(_today.AddDays(-10), withTmdbId: true);
+
+        Assert.True(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 7, importSpecials: true));
+    }
+
+    [Fact]
+    public void ShouldPrune_SpecialWithSpecialsDisabled_ReturnsTrue()
+    {
+        // Specials are removed entirely when the specials option is off, even when not in pruning mode.
+        var episode = VirtualEpisode(_today.AddDays(5), withTmdbId: true, seasonNumber: 0);
+
+        Assert.True(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: false, _today, gracePeriodDays: 7, importSpecials: false));
+    }
+
+    [Fact]
+    public void ShouldPrune_SpecialWithSpecialsEnabled_FollowsNormalRules()
+    {
+        // With specials enabled, an upcoming special is kept like any other upcoming episode.
+        var episode = VirtualEpisode(_today.AddDays(5), withTmdbId: true, seasonNumber: 0);
+
+        Assert.False(TmdbMissingEpisodeProvider.ShouldPrune(episode, pruneAgedOut: true, _today, gracePeriodDays: 7, importSpecials: true));
+    }
+
+    [Fact]
+    public void GetPremiereDate_NullAirDate_ReturnsNull()
+    {
+        Assert.Null(TmdbMissingEpisodeProvider.GetPremiereDate(new TvSeasonEpisode { AirDate = null }));
+    }
+
+    [Fact]
+    public void GetPremiereDate_AirDate_ReturnsUtc()
+    {
+        var airDate = new DateTime(2026, 7, 28);
+
+        var result = TmdbMissingEpisodeProvider.GetPremiereDate(new TvSeasonEpisode { AirDate = airDate });
+
+        Assert.NotNull(result);
+        Assert.Equal(DateTimeKind.Utc, result!.Value.Kind);
+        Assert.Equal(DateTime.SpecifyKind(airDate, DateTimeKind.Local).ToUniversalTime(), result.Value);
+    }
+
+    [Fact]
+    public void UpdateVirtualEpisode_PlaceholderTitleReplaced_UpdatesAndReturnsTrue()
+    {
+        var episode = new Episode { Name = "Episode 14" };
+        var tmdbEpisode = new TvSeasonEpisode { Name = "The Real Title" };
+
+        Assert.True(TmdbMissingEpisodeProvider.UpdateVirtualEpisode(episode, tmdbEpisode, null));
+        Assert.Equal("The Real Title", episode.Name);
+    }
+
+    [Fact]
+    public void UpdateVirtualEpisode_NoChanges_ReturnsFalse()
+    {
+        var date = _today;
+        var episode = new Episode { Name = "Same", Overview = "Description", PremiereDate = date };
+        var tmdbEpisode = new TvSeasonEpisode { Name = "Same", Overview = "Description" };
+
+        Assert.False(TmdbMissingEpisodeProvider.UpdateVirtualEpisode(episode, tmdbEpisode, date));
+    }
+
+    [Fact]
+    public void UpdateVirtualEpisode_EmptyTmdbValues_DoNotOverwrite()
+    {
+        var episode = new Episode { Name = "Existing", Overview = "Existing overview" };
+        var tmdbEpisode = new TvSeasonEpisode { Name = string.Empty, Overview = null };
+
+        Assert.False(TmdbMissingEpisodeProvider.UpdateVirtualEpisode(episode, tmdbEpisode, null));
+        Assert.Equal("Existing", episode.Name);
+        Assert.Equal("Existing overview", episode.Overview);
+    }
+
+    [Fact]
+    public void UpdateVirtualEpisode_RescheduledAirDate_UpdatesPremiereAndYear()
+    {
+        var episode = new Episode { Name = "X", PremiereDate = new DateTime(2026, 7, 1, 0, 0, 0, DateTimeKind.Utc) };
+        var newAirDate = new DateTime(2026, 8, 15);
+        var newPremiere = DateTime.SpecifyKind(newAirDate, DateTimeKind.Local).ToUniversalTime();
+        var tmdbEpisode = new TvSeasonEpisode { Name = "X", AirDate = newAirDate };
+
+        Assert.True(TmdbMissingEpisodeProvider.UpdateVirtualEpisode(episode, tmdbEpisode, newPremiere));
+        Assert.Equal(newPremiere, episode.PremiereDate);
+        Assert.Equal(2026, episode.ProductionYear);
+    }
+
+    [Fact]
+    public void BuildSeasonSortNameTemplate_NoNameSortedPhysicalSeason_ReturnsNull()
+    {
+        // No physical season carries a forced (name-based) sort name -> virtual seasons keep their
+        // bare-index sort, so no template is produced.
+        var seasons = new[]
+        {
+            PhysicalSeason(1, forcedSortName: null),
+            VirtualSeason(3),
+        };
+
+        Assert.Null(TmdbMissingEpisodeProvider.BuildSeasonSortNameTemplate(seasons));
+    }
+
+    [Fact]
+    public void BuildSeasonSortNameTemplate_MirrorsSiblingConventionAndSwapsNumber()
+    {
+        var template = TmdbMissingEpisodeProvider.BuildSeasonSortNameTemplate(new[]
+        {
+            PhysicalSeason(1, forcedSortName: "Season 01"),
+            VirtualSeason(3),
+        });
+
+        Assert.NotNull(template);
+        // Keeps the sibling's text token and zero-padding width, swapping in the target number.
+        Assert.Equal("Season 03", template!(3));
+        Assert.Equal("Season 12", template(12));
+    }
+
+    [Fact]
+    public void BuildSeasonSortNameTemplate_PreservesNonEnglishToken()
+    {
+        var template = TmdbMissingEpisodeProvider.BuildSeasonSortNameTemplate(new[]
+        {
+            PhysicalSeason(1, forcedSortName: "Staffel 1"),
+            VirtualSeason(2),
+        });
+
+        Assert.NotNull(template);
+        Assert.Equal("Staffel 2", template!(2));
+    }
+
+    [Fact]
+    public void BuildSeasonSortNameTemplate_SiblingWithoutDigits_ReturnsNull()
+    {
+        var template = TmdbMissingEpisodeProvider.BuildSeasonSortNameTemplate(new[]
+        {
+            PhysicalSeason(1, forcedSortName: "Miniseries"),
+            VirtualSeason(2),
+        });
+
+        Assert.Null(template);
+    }
+
+    [Fact]
+    public void BuildSeasonSortNameTemplate_IgnoresVirtualSeasonsAsReference()
+    {
+        // A virtual season's own forced sort name must not be used as the convention source.
+        var virtualWithForced = VirtualSeason(3);
+        virtualWithForced.ForcedSortName = "Season 03";
+
+        Assert.Null(TmdbMissingEpisodeProvider.BuildSeasonSortNameTemplate(new[]
+        {
+            PhysicalSeason(1, forcedSortName: null),
+            virtualWithForced,
+        }));
+    }
+
+    private static Season PhysicalSeason(int indexNumber, string? forcedSortName)
+    {
+        var season = new Season { IndexNumber = indexNumber, Path = $"/media/show/Season {indexNumber:00}" };
+        if (!string.IsNullOrEmpty(forcedSortName))
+        {
+            season.ForcedSortName = forcedSortName;
+        }
+
+        return season;
+    }
+
+    private static Season VirtualSeason(int indexNumber)
+        => new Season { IndexNumber = indexNumber, IsVirtualItem = true };
+
+    private static Episode VirtualEpisode(DateTime premiereDate, bool withTmdbId, int? seasonNumber = null)
+    {
+        var episode = new Episode { PremiereDate = premiereDate, IsVirtualItem = true, ParentIndexNumber = seasonNumber };
+        if (withTmdbId)
+        {
+            episode.SetProviderId(MetadataProvider.Tmdb, "123");
+        }
+
+        return episode;
+    }
+}