method

assert_broadcast_on

v7.2.3 - 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 116
    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?
        new_messages = new_broadcasts_from(new_messages, stream, "assert_broadcast_on", &block)
      end

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

      error_message = "No messages sent with #{data} to #{stream}"

      if new_messages.any?
        error_message = new_messages.inject("#{error_message}\nMessage(s) found:\n") do |error_message, new_message|
          error_message + "#{ActiveSupport::JSON.decode(new_message)}\n"
        end
      else
        error_message = "#{error_message}\nNo message found for #{stream}"
      end

      assert message, error_message
    end

assert_broadcast_on

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