Update broadcast_message helper

Now it returns the fully-formatted message so we can be consistent about
how it's shown.

app/helpers/application_helper.rb

@@ -181,10 +181,6 @@ module ApplicationHelper
     end
   end
 
-  def broadcast_message
-    BroadcastMessage.current
-  end
-
   # Render a `time` element with Javascript-based relative date and tooltip
   #
   # time       - Time object

app/helpers/broadcast_messages_helper.rb

@@ -1,16 +1,24 @@
 module BroadcastMessagesHelper
-  def broadcast_styling(broadcast_message)
-    styling = ''
+  def broadcast_message(message = BroadcastMessage.current)
+    return unless message.present?
+
+    content_tag :div, class: 'broadcast-message', style: broadcast_message_style(message) do
+      icon('bullhorn') << ' ' << message.message
+    end
+  end
+
+  def broadcast_message_style(broadcast_message)
+    style = ''
 
     if broadcast_message.color.present?
-      styling << "background-color: #{broadcast_message.color}"
-      styling << '; ' if broadcast_message.font.present?
+      style << "background-color: #{broadcast_message.color}"
+      style << '; ' if broadcast_message.font.present?
     end
 
     if broadcast_message.font.present?
-      styling << "color: #{broadcast_message.font}"
+      style << "color: #{broadcast_message.font}"
     end
 
-    styling
+    style
   end
 end

app/views/layouts/_broadcast.html.haml

@@ -1,4 +1 @@
-- if broadcast_message.present?
-  .broadcast-message{ style: broadcast_styling(broadcast_message) }
-    = icon('bullhorn')
-    = broadcast_message.message
+= broadcast_message

spec/helpers/broadcast_messages_helper_spec.rb

@@ -1,22 +1,40 @@
 require 'spec_helper'
 
 describe BroadcastMessagesHelper do
-  describe 'broadcast_styling' do
-    let(:broadcast_message) { double(color: '', font: '') }
-
-    context "default style" do
-      it "should have no style" do
-        expect(broadcast_styling(broadcast_message)).to eq ''
-      end
+  describe 'broadcast_message' do
+    it 'returns nil when no current message' do
+      expect(helper.broadcast_message(nil)).to be_nil
     end
 
-    context "customized style" do
-      let(:broadcast_message) { double(color: "#f2dede", font: '#b94a48') }
+    it 'includes the current message' do
+      current = double(message: 'Current Message')
 
-      it "should have a customized style" do
-        expect(broadcast_styling(broadcast_message)).
-          to match('background-color: #f2dede; color: #b94a48')
-      end
+      allow(helper).to receive(:broadcast_message_style).and_return(nil)
+
+      expect(helper.broadcast_message(current)).to include 'Current Message'
+    end
+
+    it 'includes custom style' do
+      current = double(message: 'Current Message')
+
+      allow(helper).to receive(:broadcast_message_style).and_return('foo')
+
+      expect(helper.broadcast_message(current)).to include 'style="foo"'
+    end
+  end
+
+  describe 'broadcast_message_style' do
+    it 'defaults to no style' do
+      broadcast_message = spy
+
+      expect(helper.broadcast_message_style(broadcast_message)).to eq ''
+    end
+
+    it 'allows custom style' do
+      broadcast_message = double(color: '#f2dede', font: '#b94a48')
+
+      expect(helper.broadcast_message_style(broadcast_message)).
+        to match('background-color: #f2dede; color: #b94a48')
     end
   end
 end