Removed duplicate methods date_range_string and date_string.

Added tests for date_string function

corrections in the test

app/controllers/application_controller.rb

@@ -5,7 +5,6 @@ class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
   before_filter :get_conferences
   before_filter :store_location
-  helper_method :date_string
   # Ensure every controller authorizes resource or skips authorization (skip_authorization_check)
   check_authorization unless: :devise_controller?
 
@@ -68,39 +67,4 @@ class ApplicationController < ActionController::Base
   def not_found
     raise ActionController::RoutingError.new('Not Found')
   end
-
-  ##
-  # Returns a string build from the start and end date of the given conference.
-  #
-  # If the conference is only one day long
-  # * %B %d %Y (January 17 2014)
-  # If the conference starts and ends in the same month and year
-  # * %B %d - %d, %Y (January 17 - 21 2014)
-  # If the conference ends in another month but in the same year
-  # * %B %d - %B %d, %Y (January 31 - February 02 2014)
-  # All other cases
-  # * %B %d, %Y - %B %d, %Y (December 30, 2013 - January 02, 2014)
-  def date_string(start_date, end_date)
-    startstr = 'Unknown - '
-    endstr = 'Unknown'
-    # When the conference  in the same month
-    if start_date.month == end_date.month && start_date.year == end_date.year
-      if start_date.day == end_date.day
-        startstr = start_date.strftime('%B %d')
-        endstr = end_date.strftime(' %Y')
-      else
-        startstr = start_date.strftime('%B %d - ')
-        endstr = end_date.strftime('%d, %Y')
-      end
-    elsif start_date.month != end_date.month && start_date.year == end_date.year
-      startstr = start_date.strftime('%B %d - ')
-      endstr = end_date.strftime('%B %d, %Y')
-    else
-      startstr = start_date.strftime('%B %d, %Y - ')
-      endstr = end_date.strftime('%B %d, %Y')
-    end
-
-    result = startstr + endstr
-    result
-  end
 end

app/helpers/application_helper.rb

@@ -1,4 +1,39 @@
 module ApplicationHelper
+  ##
+  # Returns a string build from the start and end date of the given conference.
+  #
+  # If the conference is only one day long
+  # * %B %d %Y (January 17 2014)
+  # If the conference starts and ends in the same month and year
+  # * %B %d - %d, %Y (January 17 - 21 2014)
+  # If the conference ends in another month but in the same year
+  # * %B %d - %B %d, %Y (January 31 - February 02 2014)
+  # All other cases
+  # * %B %d, %Y - %B %d, %Y (December 30, 2013 - January 02, 2014)
+  def date_string(start_date, end_date)
+    startstr = 'Unknown - '
+    endstr = 'Unknown'
+    # When the conference is in the same month
+    if start_date.month == end_date.month && start_date.year == end_date.year
+      if start_date.day == end_date.day
+        startstr = start_date.strftime('%B %d')
+        endstr = end_date.strftime(' %Y')
+      else
+        startstr = start_date.strftime('%B %d - ')
+        endstr = end_date.strftime('%d, %Y')
+      end
+    elsif start_date.month != end_date.month && start_date.year == end_date.year
+      startstr = start_date.strftime('%B %d - ')
+      endstr = end_date.strftime('%B %d, %Y')
+    else
+      startstr = start_date.strftime('%B %d, %Y - ')
+      endstr = end_date.strftime('%B %d, %Y')
+    end
+
+    result = startstr + endstr
+    result
+  end
+
   ##
   # Checks if the voting has already started, or if it has already ended
   #

app/models/conference.rb

@@ -68,24 +68,6 @@ class Conference < ActiveRecord::Base
 
   after_create :create_free_ticket
 
-  def date_range_string
-    startstr = 'Unknown - '
-    endstr = 'Unknown'
-    if start_date.month == end_date.month && start_date.year == end_date.year
-      startstr = start_date.strftime('%B %d - ')
-      endstr = end_date.strftime('%d, %Y')
-    elsif start_date.month != end_date.month && start_date.year == end_date.year
-      startstr = start_date.strftime('%B %d - ')
-      endstr = end_date.strftime('%B %d, %Y')
-    else
-      startstr = start_date.strftime('%B %d, %Y - ')
-      endstr = end_date.strftime('%B %d, %Y')
-    end
-
-    result = startstr + endstr
-    result
-  end
-
   ##
   # Checks if the user is registered to the conference
   #

app/serializers/conference_serializer.rb

@@ -1,4 +1,5 @@
 class ConferenceSerializer < ActiveModel::Serializer
+  include ApplicationHelper
   attributes :short_title, :title, :description, :start_date, :end_date, :picture_url,
              :difficulty_levels, :event_types, :rooms, :tracks,
              :date_range, :revision
@@ -58,8 +59,8 @@ class ConferenceSerializer < ActiveModel::Serializer
   end
 
   def date_range
-    if defined? object.date_range_string
+    if defined? date_string(object.start_date, object.end_date)
-        object.date_range_string.try(:split, ',').try(:first)
+        date_string(object.start_date, object.end_date).try(:split, ',').try(:first)
     end
   end
 end

spec/helpers/application_helper_spec.rb

@@ -60,6 +60,24 @@ describe ApplicationHelper, type: :helper do
     end
   end
 
+  describe '#date_string' do
+    it 'when conference lasts 1 day' do
+      expect(date_string('Sun, 19 Feb 2017'.to_time, 'Sun, 19 Feb 2017'.to_time)).to eq 'February 19 2017'
+    end
+
+    it 'when conference starts and ends in the same month and year' do
+      expect(date_string('Sun, 19 Feb 2017'.to_time, 'Tue, 28 Feb 2017'.to_time)).to eq 'February 19 - 28, 2017'
+    end
+
+    it 'when conference ends in another month, of the same year' do
+      expect(date_string('Sun, 19 Feb 2017'.to_time, 'Tue, 28 March 2017'.to_time)).to eq 'February 19 - March 28, 2017'
+    end
+
+    it 'when conference ends in another month, of a different year' do
+      expect(date_string('Sun, 19 Feb 2017'.to_time, 'Sun, 12 March 2018'.to_time)).to eq 'February 19, 2017 - March 12, 2018'
+    end
+  end
+
   describe '#registered_text' do
     describe 'returns correct string' do
       it 'when there are no registrations' do