class ChatChannelTest < ActionCable::Channel::TestCase
  def test_subscribed_with_room_number
    # Simulate a subscription creation
    subscribe room_number: 1

    # Asserts that the subscription was successfully created
    assert subscription.confirmed?

    # Asserts that the channel subscribes connection to a stream
    assert "chat_1", streams.last
  end

  def test_does_not_subscribe_without_room_number
    subscribe

    # Asserts that the subscription was rejected
    assert subscription.rejected?
  end
end

def test_perform_speak
  subscribe room_number: 1

  perform :speak, message: "Hello, Rails!"

  # `transmissions` stores messages sent directly to the channel (i.e. with `transmit` method)
  assert_equal "Hello, Rails!", transmissions.last["text"]
end

class ChatChannelTest < ActionCable::Channel::TestCase
  include ActionCable::TestHelper

  def test_identifiers
    stub_connection(user: users[:john])

    subscribe room_number: 1

    assert_broadcasts_on("messages_1", text: "I'm here!", from: "John") do
      perform :speak, message: "I'm here!"
    end
  end
end

class ChatChannelTest < ActionCable::Channel::TestCase
  def setup
    @room = Room.find 1

    stub_connection(user: users[:john])
    subscribe room_number: room.id
  end

  def test_broadcasting
    assert_broadcasts(@room, 1) do
      perform :speak, message: "I'm here!"
    end
  end

  # or

  def test_broadcasted_data
    assert_broadcasts_on(@room, text: "I'm here!", from: "John") do
      perform :speak, message: "I'm here!"
    end
  end
end