Add #queue and #next for Schedule

lib/crono/schedule.rb

@@ -5,6 +5,16 @@ module Crono
     end
 
     def add(peformer, period)
+      @schedule << [peformer, period]
+    end
+
+    def next
+      [queue.first[0], queue.first[1].next]
+    end
+
+    private
+    def queue
+      @schedule.sort { |a,b| a[1].next <=> b[1].next }
     end
   end
 end

spec/schedule_spec.rb

@@ -5,11 +5,16 @@ class TestJob
 end
 
 describe Crono::Schedule do
-  describe "#add" do
-    it "should add an entry to schedule" do
+  describe "#next" do
+    it "should return next job in schedule" do
       @schedule = Crono::Schedule.new
-      @period = Crono::Period.new(1.day)
-      @schedule.add(TestJob, @period)
+      [
+        Crono::Period.new(3.day, at: "18:55"),
+        Crono::Period.new(1.day, at: "15:30"),
+        Crono::Period.new(7.day, at: "06:05")
+      ].each { |period| @schedule.add(TestJob, period) }
+
+      expect(@schedule.next).to be_eql([TestJob, 1.day.from_now.change(hour: 15, min: 30)])
     end
   end
 end