Add basic Period class

Gemfile.lock

@@ -3,6 +3,7 @@ PATH
   specs:
     periodicity (0.0.1)
       activejob
+      activesupport
 
 GEM
   remote: https://rubygems.org/
@@ -37,6 +38,7 @@ GEM
       rspec-support (~> 3.2.0)
     rspec-support (3.2.2)
     thread_safe (0.3.4)
+    timecop (0.7.3)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
 
@@ -48,3 +50,4 @@ DEPENDENCIES
   periodicity!
   rake
   rspec (~> 3.0)
+  timecop

lib/periodicity.rb

@@ -1,6 +1,7 @@
 module Periodicity
 end
 
+require "active_support/all"
 require "periodicity/version.rb"
 require "periodicity/period.rb"
 require "periodicity/rails.rb"

lib/periodicity/extensions/active_job.rb

@@ -1,7 +1,8 @@
 module Periodicity
   module Extensions
     class ActiveJob
-      def perform_every(period, *args)
+      def self.perform_every(period, *args)
+        @period = period
       end
     end
   end

lib/periodicity/period.rb

@@ -0,0 +1,11 @@
+module Periodicity
+  class Period
+    def initialize(period)
+      @period = period
+    end
+
+    def next
+      @period.from_now
+    end
+  end
+end

periodicity.gemspec

@@ -13,9 +13,11 @@ Gem::Specification.new do |s|
   s.rubyforge_project         = "periodicity"
 
   s.add_runtime_dependency      "activejob"
+  s.add_runtime_dependency      "activesupport"
   s.add_development_dependency  "rake"
   s.add_development_dependency  "bundler", ">= 1.0.0"
   s.add_development_dependency  "rspec", "~> 3.0"
+  s.add_development_dependency  "timecop"
 
   s.files        = `git ls-files`.split("\n")
   s.executables  = `git ls-files`.split("\n").map{|f| f =~ /^bin\/(.*)/ ? $1 : nil}.compact

spec/period_spec.rb

@@ -0,0 +1,18 @@
+require "spec_helper"
+
+describe Periodicity::Period do
+  around(:each) do |example|
+    Timecop.freeze do
+      example.run
+    end
+  end
+
+  describe "#next" do
+    context "in daily basis" do
+      it "should return the time 2 days from now" do
+        @period = Periodicity::Period.new(2.day)
+        expect(@period.next).to be_eql(2.day.from_now)
+      end
+    end
+  end
+end

spec/spec_helper.rb

@@ -1,7 +1,9 @@
 require 'bundler/setup'
 Bundler.setup
 
+require 'timecop'
 require 'periodicity'
 
+
 RSpec.configure do |config|
 end