Can print an individual medium tracklist

test/music_library/records/tracklist_pdf_test.exs

@@ -80,6 +80,28 @@ defmodule MusicLibrary.Records.TracklistPdfTest do
     end
   end
 
+  describe "generate_medium/3" do
+    test "generates PDF for a single medium from a multi-disc release" do
+      record = build_record(%{title: "Marbles", artists: [%{name: "Marillion"}]})
+      api_response = MusicBrainz.Fixtures.Release.release_with_media(:marbles)
+      release = Release.from_api_response(api_response)
+
+      assert {:ok, <<@pdf_magic_bytes, _::binary>>} =
+               TracklistPdf.generate_medium(record, release, 1)
+    end
+
+    test "returns error for non-existent medium number" do
+      record = build_record(%{title: "Test Album", artists: [%{name: "Test Artist"}]})
+
+      release =
+        build_release([
+          build_medium(1, [build_track(1, "Track One", 200_000)])
+        ])
+
+      assert {:error, :medium_not_found} = TracklistPdf.generate_medium(record, release, 99)
+    end
+  end
+
   describe "layout_params/2" do
     test "single column for small track count" do
       assert {1, 8, true} = TracklistPdf.layout_params(10, 1)