Use turbo streams for the bout board instead of auto refreshing every 30 seconds.

test/models/up_matches_broadcast_test.rb

@@ -0,0 +1,87 @@
+require "test_helper"
+
+class UpMatchesBroadcastTest < ActiveSupport::TestCase
+  test "tournament broadcaster emits replace action for up matches board" do
+    tournament = tournaments(:one)
+    stream = stream_name_for(tournament)
+    clear_streams(stream)
+
+    Tournament.broadcast_up_matches_board(tournament.id)
+
+    assert_operator broadcasts_for(stream).size, :>, 0
+    payload = broadcasts_for(stream).last
+    assert_up_matches_replace_payload(payload)
+  end
+
+  test "mat queue change broadcasts up matches board update" do
+    tournament = tournaments(:one)
+    mat = mats(:one)
+    match = matches(:tournament_1_bout_2000)
+    stream = stream_name_for(tournament)
+    clear_streams(stream)
+
+    mat.update!(queue1: match.id)
+
+    assert_operator broadcasts_for(stream).size, :>, 0
+    assert_up_matches_replace_payload(broadcasts_for(stream).last)
+  end
+
+  test "match mat assignment change broadcasts up matches board update" do
+    tournament = tournaments(:one)
+    mat = mats(:one)
+    match = matches(:tournament_1_bout_2001)
+    stream = stream_name_for(tournament)
+    clear_streams(stream)
+
+    match.update!(mat_id: mat.id)
+
+    assert_operator broadcasts_for(stream).size, :>, 0
+    assert_up_matches_replace_payload(broadcasts_for(stream).last)
+  end
+
+  test "mat update without queue slot changes does not broadcast up matches board update" do
+    tournament = tournaments(:one)
+    mat = mats(:one)
+    stream = stream_name_for(tournament)
+    clear_streams(stream)
+
+    mat.update!(name: "Mat One Renamed")
+
+    assert_equal 0, broadcasts_for(stream).size
+  end
+
+  test "match update without mat_id change does not broadcast up matches board update" do
+    tournament = tournaments(:one)
+    match = matches(:tournament_1_bout_2001)
+    stream = stream_name_for(tournament)
+    clear_streams(stream)
+
+    match.update!(w1_stat: "Local stat change")
+
+    assert_equal 0, broadcasts_for(stream).size
+  end
+
+  private
+
+  def broadcasts_for(stream)
+    ActionCable.server.pubsub.broadcasts(stream)
+  end
+
+  def clear_streams(*streams)
+    ActionCable.server.pubsub.clear
+    streams.each do |stream|
+      broadcasts_for(stream).clear
+    end
+  end
+
+  def stream_name_for(streamable)
+    Turbo::StreamsChannel.send(:stream_name_from, [streamable])
+  end
+
+  # Broadcast payloads may be JSON-escaped in test adapters, so assert semantic markers.
+  def assert_up_matches_replace_payload(payload)
+    assert_includes payload, "up_matches_board"
+    assert_includes payload, "replace"
+    assert_includes payload, "turbo-stream"
+  end
+end