Passing in a Hash instance as non-kwargs parameters has to be curly braced

actioncable/test/channel/base_test.rb

@@ -64,7 +64,7 @@ class ActionCable::Channel::BaseTest < ActionCable::TestCase
     end
 
     def get_latest
-      transmit data: "latest"
+      transmit({ data: "latest" })
     end
 
     def receive

actioncable/test/channel/test_case_test.rb

@@ -136,7 +136,7 @@ class PerformTestChannel < ActionCable::Channel::Base
   end
 
   def ping
-    transmit type: "pong"
+    transmit({ type: "pong" })
   end
 end
 
@@ -173,7 +173,7 @@ class BroadcastsTestChannel < ActionCable::Channel::Base
   def broadcast(data)
     ActionCable.server.broadcast(
       "broadcast_#{params[:id]}",
-      text: data["message"], user_id: user_id
+      { text: data["message"], user_id: user_id }
     )
   end
 

actioncable/test/client_test.rb

@@ -40,16 +40,16 @@ class ClientTest < ActionCable::TestCase
     end
 
     def ding(data)
-      transmit(dong: data["message"])
+      transmit({ dong: data["message"] })
     end
 
     def delay(data)
       sleep 1
-      transmit(dong: data["message"])
+      transmit({ dong: data["message"] })
     end
 
     def bulk(data)
-      ActionCable.server.broadcast "global", wide: data["message"]
+      ActionCable.server.broadcast "global", { wide: data["message"] }
     end
   end
 

actioncable/test/test_helper_test.rb

@@ -88,7 +88,7 @@ class TransmittedDataTest < ActionCable::TestCase
   def test_assert_broadcast_on_with_hash
     assert_nothing_raised do
       assert_broadcast_on("test", text: "hello") do
-        ActionCable.server.broadcast "test", text: "hello"
+        ActionCable.server.broadcast "test", { text: "hello" }
       end
     end
   end