SunDi3yansyah · May 31, 2020 10:36 · Jun 5, 2017 · Jun 4, 2017
diff --git a/test_channel_spec.rb b/test_channel_spec.rb
@@ -1,15 +1,16 @@
-# app/channels/test_channel.rb
-class TestChannel < ActionCable::Channel::Base
-  def test_action(data)
-    times_to_broadcast = data.fetch("times_to_broadcast")
-
-    times_to_broadcast.times do
-      ActionCable.server.broadcast("test", current_profile.name)
+# app/channels/hello_channel.rb
+class HelloChannel < ActionCable::Channel::Base
+  def say_hello(data)
+    times_to_say_hello = data.fetch("times_to_say_hello")
+    hello = "Hello, #{current_profile.name}!"
+
+    times_to_say_hello.times do
+      ActionCable.server.broadcast(current_profile.id, hello)
     end
   end
 end
 
-# spec/channels_test_channel_spec.rb
+# spec/channels/hello_channel_spec.rb
 require "spec_helper"
 
 # This is the minimal ActionCable connection stub to make the test pass
@@ -29,10 +30,10 @@ def initialize(identifiers_hash = {})
   end
 end
 
-RSpec.describe TestChannel do
+RSpec.describe HelloChannel do
   subject(:channel) { described_class.new(connection, {}) }
 
-  let(:current_profile) { double(name: "Bob") }
+  let(:current_profile) { double(id: "1", name: "Bob") }
 
   # Connection is `identified_by :current_profile`
   let(:connection) { TestConnection.new(current_profile: current_profile) }
@@ -44,12 +45,12 @@ def initialize(identifiers_hash = {})
   let(:data) do
     {
       "action" => "test_action",
-      "times_to_broadcast" => 3
+      "times_to_say_hello" => 3
     }
   end
 
-  it "brodcasts 'Bob' 3 times"  do
-    expect(action_cable).to receive(:broadcast).with("test", "Bob").exactly(3).times
+  it "broadcasts 'Hello, Bob!' 3 times"  do
+    expect(action_cable).to receive(:broadcast).with("1", "Hello, Bob!").exactly(3).times
 
     channel.perform_action(data)
   end

diff --git a/test_channel_spec.rb b/test_channel_spec.rb
@@ -0,0 +1,56 @@
+# app/channels/test_channel.rb
+class TestChannel < ActionCable::Channel::Base
+  def test_action(data)
+    times_to_broadcast = data.fetch("times_to_broadcast")
+
+    times_to_broadcast.times do
+      ActionCable.server.broadcast("test", current_profile.name)
+    end
+  end
+end
+
+# spec/channels_test_channel_spec.rb
+require "spec_helper"
+
+# This is the minimal ActionCable connection stub to make the test pass
+class TestConnection
+  attr_reader :identifiers, :logger
+
+  def initialize(identifiers_hash = {})
+    @identifiers = identifiers_hash.keys
+    @logger = ActiveSupport::TaggedLogging.new(ActiveSupport::Logger.new(StringIO.new))
+
+    # This is an equivalent of providing `identified_by :identifier_key` in ActionCable::Connection::Base subclass
+    identifiers_hash.each do |identifier, value|
+      define_singleton_method(identifier) do
+        value
+      end
+    end
+  end
+end
+
+RSpec.describe TestChannel do
+  subject(:channel) { described_class.new(connection, {}) }
+
+  let(:current_profile) { double(name: "Bob") }
+
+  # Connection is `identified_by :current_profile`
+  let(:connection) { TestConnection.new(current_profile: current_profile) }
+
+  let(:action_cable) { ActionCable.server }
+
+  # ActionCable dispatches actions by the `action` attribute.
+  # In this test we assume the payload was successfully parsed (it could be a JSON payload, for example). 
+  let(:data) do
+    {
+      "action" => "test_action",
+      "times_to_broadcast" => 3
+    }
+  end
+
+  it "brodcasts 'Bob' 3 times"  do
+    expect(action_cable).to receive(:broadcast).with("test", "Bob").exactly(3).times
+
+    channel.perform_action(data)
+  end
+end