From 8fde483eb02f6d89eaab8590a4ddcd406d74900f Mon Sep 17 00:00:00 2001
From: Pratik Naik <pratiknaik@gmail.com>
Date: Sat, 11 Jul 2015 20:27:44 -0500
Subject: Tests for the Channel API

---
 test/channel_test.rb | 138 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 120 insertions(+), 18 deletions(-)

diff --git a/test/channel_test.rb b/test/channel_test.rb
index 145308e3fc..3f7847a12d 100644
--- a/test/channel_test.rb
+++ b/test/channel_test.rb
@@ -1,20 +1,122 @@
 require 'test_helper'
 
-# FIXME: Currently busted.
-#
-# class ChannelTest < ActionCableTest
-#   class PingChannel < ActionCable::Channel::Base
-#   end
-# 
-#   class PingServer < ActionCable::Server::Base
-#     register_channels PingChannel
-#   end
-# 
-#   def app
-#     PingServer
-#   end
-# 
-#   test "channel callbacks" do
-#     ws = Faye::WebSocket::Client.new(websocket_url)
-#   end
-# end 
\ No newline at end of file
+class ChannelTest < ActiveSupport::TestCase
+  Room = Struct.new(:id)
+  User = Struct.new(:name)
+
+  class TestConnection
+    attr_reader :identifiers, :logger, :current_user, :transmissions
+
+    def initialize(user)
+      @identifiers = [ :current_user ]
+
+      @current_user = user
+      @logger = Logger.new(StringIO.new)
+      @transmissions = []
+    end
+
+    def transmit(data)
+      @transmissions << data
+    end
+
+    def last_transmission
+      @transmissions.last
+    end
+  end
+
+  class ChatChannel < ActionCable::Channel::Base
+    attr_reader :room, :last_action
+    on_subscribe :toggle_subscribed
+    on_unsubscribe :toggle_subscribed
+
+    def subscribed
+      @room = Room.new params[:id]
+      @actions = []
+    end
+
+    def unsubscribed
+      @room = nil
+    end
+
+    def toggle_subscribed
+      @subscribed = !@subscribed
+    end
+
+    def leave
+      @last_action = [ :leave ]
+    end
+
+    def speak(data)
+      @last_action = [ :speak, data ]
+    end
+
+    def subscribed?
+      @subscribed
+    end
+
+    def get_latest
+      transmit data: 'latest'
+    end
+
+    private
+      def rm_rf
+        @last_action = [ :rm_rf ]
+      end
+  end
+
+  setup do
+    @user = User.new "lifo"
+    @connection = TestConnection.new(@user)
+    @channel = ChatChannel.new @connection, "{id: 1}", { id: 1 }
+  end
+
+  test "should subscribe to a channel on initialize" do
+    assert_equal 1, @channel.room.id
+  end
+
+  test "on subscribe callbacks" do
+    assert @channel.subscribed
+  end
+
+  test "channel params" do
+    assert_equal({ id: 1 }, @channel.params)
+  end
+
+  test "unsubscribing from a channel" do
+    assert @channel.room
+    assert @channel.subscribed?
+
+    @channel.unsubscribe_from_channel
+
+    assert ! @channel.room
+    assert ! @channel.subscribed?
+  end
+
+  test "connection identifiers" do
+    assert_equal @user.name, @channel.current_user.name
+  end
+
+  test "callable action without any argument" do
+    @channel.perform_action 'action' => :leave
+    assert_equal [ :leave ], @channel.last_action
+  end
+
+  test "callable action with arguments" do
+    data = { 'action' => :speak, 'content' => "Hello World" }
+
+    @channel.perform_action data
+    assert_equal [ :speak, data ], @channel.last_action
+  end
+
+  test "try calling a private method" do
+    @channel.perform_action 'action' => :rm_rf
+    assert_nil @channel.last_action
+  end
+
+  test "transmitting data" do
+    @channel.perform_action 'action' => :get_latest
+
+    expected = ActiveSupport::JSON.encode "identifier" => "{id: 1}", "message" => { "data" => "latest" }
+    assert_equal expected, @connection.last_transmission
+  end
+end
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