method

assert_broadcast_on

v6.1.3.1 - Show latest stable - Class: ActionCable::TestHelper

assert_broadcast_on(stream, data, &block)

public

Asserts that the specified message has been sent to the stream.

def test_assert_transmitted_message
  ActionCable.server.broadcast 'messages', text: 'hello'
  assert_broadcast_on('messages', text: 'hello')
end

If a block is passed, that block should cause a message with the specified data to be sent.

def test_assert_broadcast_on_again
  assert_broadcast_on('messages', text: 'hello') do
    ActionCable.server.broadcast 'messages', text: 'hello'
  end
end

# File actioncable/lib/action_cable/test_helper.rb, line 97
    def assert_broadcast_on(stream, data, &block)
      # Encode to JSON and backâwe want to use this value to compare
      # with decoded JSON.
      # Comparing JSON strings doesn't work due to the order if the keys.
      serialized_msg =
        ActiveSupport::JSON.decode(ActiveSupport::JSON.encode(data))

      new_messages = broadcasts(stream)
      if block_given?
        old_messages = new_messages
        clear_messages(stream)

        assert_nothing_raised(&block)
        new_messages = broadcasts(stream)
        clear_messages(stream)

        # Restore all sent messages
        (old_messages + new_messages).each { |m| pubsub_adapter.broadcast(stream, m) }
      end

      message = new_messages.find { |msg| ActiveSupport::JSON.decode(msg) == serialized_msg }

      assert message, "No messages sent with #{data} to #{stream}"
    end

assert_broadcast_on

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