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-rw-r--r--actioncable/test/subscription_adapter/subscriber_map_test.rb19
1 files changed, 19 insertions, 0 deletions
diff --git a/actioncable/test/subscription_adapter/subscriber_map_test.rb b/actioncable/test/subscription_adapter/subscriber_map_test.rb
new file mode 100644
index 0000000000..ed81099cbc
--- /dev/null
+++ b/actioncable/test/subscription_adapter/subscriber_map_test.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class SubscriberMapTest < ActionCable::TestCase
+ test "broadcast should not change subscribers" do
+ setup_subscription_map
+ origin = @subscription_map.instance_variable_get(:@subscribers).dup
+
+ @subscription_map.broadcast("not_exist_channel", "")
+
+ assert_equal origin, @subscription_map.instance_variable_get(:@subscribers)
+ end
+
+ private
+ def setup_subscription_map
+ @subscription_map = ActionCable::SubscriptionAdapter::SubscriberMap.new
+ end
+end