1 files changed, 31 insertions, 0 deletions
diff --git a/packages/meshbay-node/tests/test_stream_subtitle_tracks.py b/packages/meshbay-node/tests/test_stream_subtitle_tracks.py
index cafb2e3..9a09edb 100644
--- a/packages/meshbay-node/tests/test_stream_subtitle_tracks.py
+++ b/packages/meshbay-node/tests/test_stream_subtitle_tracks.py
@@ -95,6 +95,9 @@ def _make_subtitled_clip(path: Path) -> None:
          "-metadata:s:s:0", "language=fre",
          "-metadata:s:s:1", "language=fre",
          "-metadata:s:s:2", "language=eng",
+         # Ordinal 1 is the forced one, and carries no title saying so — which
+         # is the case the disposition exists for.
+         "-disposition:s:1", "forced",
          str(path)],
         check=True, capture_output=True)
 
@@ -209,6 +212,31 @@ def test_bitmap_codecs_are_not_offered():
 
 
 @pytest.mark.asyncio
+async def test_a_forced_track_says_so_without_needing_a_title(tmp_path):
+    """The distinction a viewer cannot make for themselves.
+
+    A forced track carries signage and foreign dialogue only — on a real film,
+    30 cues and 77 seconds of text across 2h32, against 1559 cues and 41% of
+    the running time for the full track beside it. Selecting it and seeing
+    nothing for ten minutes is its normal behaviour, and was reported as a
+    broken feature. The container's title tag would say it too, when it is
+    there; the disposition is the half that is always there.
+    """
+    clip = tmp_path / "clip.mp4"
+    _make_subtitled_clip(clip)
+
+    probe = await _probe_video(str(clip))
+    by_ordinal = {tr.ordinal: tr for tr in probe.subtitle_tracks}
+
+    assert by_ordinal[1].forced is True
+    assert by_ordinal[2].forced is False
+    assert by_ordinal[1].title is None, (
+        "the fixture must carry no title on the forced track, or it does not "
+        "exercise the case the disposition is for")
+    assert all(not tr.hearing_impaired for tr in probe.subtitle_tracks)
+
+
+@pytest.mark.asyncio
 async def test_stream_init_announces_the_tracks(tmp_path):
     """How a client discovers this node can do subtitles at all.
 
@@ -226,6 +254,9 @@ async def test_stream_init_announces_the_tracks(tmp_path):
     init = next(m for m in session.sent if m.get("type") == "stream_init")
     assert [tr["i"] for tr in init["subtitle_tracks"]] == [1, 2]
     assert [tr["lang"] for tr in init["subtitle_tracks"]] == ["fre", "eng"]
+    assert [tr["forced"] for tr in init["subtitle_tracks"]] == [True, False], (
+        "the client cannot mark a forced track it was never told about")
+    assert [tr["sdh"] for tr in init["subtitle_tracks"]] == [False, False]
 
 
 @pytest.mark.parametrize("track", [1, 2])