diff --git a/.gitignore b/.gitignore
index 5e1422c9c..dfe0e1613 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,3 +48,11 @@ build-iPhoneSimulator/
 
 # unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
 .rvmrc
+
+#simplecov
+
+coverage
+
+#system
+
+.DS_store
diff --git a/lib/date_range.rb b/lib/date_range.rb
new file mode 100644
index 000000000..0c8d292e0
--- /dev/null
+++ b/lib/date_range.rb
@@ -0,0 +1,23 @@
+require 'date'
+
+module Hotel
+  class DateRange
+    attr_reader :check_in, :check_out, :nights_spent
+
+    def initialize(check_in, check_out)
+      raise ArgumentError, 'Invalid date range given.' unless check_out > check_in
+      @check_in = check_in
+      @check_out = check_out
+      @nights_spent = (@check_out - @check_in) 
+    end
+
+    def to_id
+      return (@check_in.year.to_s + @check_in.mon.to_s + @check_in.mday.to_s)
+    end
+
+    def overlap? (other_check_in, other_check_out)
+      return ((@check_in..@check_out).cover? (other_check_in)) || ((@check_in-1...@check_out).cover? (other_check_out))
+    end
+
+  end
+end
\ No newline at end of file
diff --git a/lib/reservation.rb b/lib/reservation.rb
new file mode 100644
index 000000000..39341e03f
--- /dev/null
+++ b/lib/reservation.rb
@@ -0,0 +1,21 @@
+require 'date'
+
+require_relative 'date_range'
+require_relative 'room'
+
+module Hotel
+  class Reservation
+    attr_reader :id, :dates, :occupancy 
+
+    def initialize(type, dates, occupancy)
+      @id = type[0] + dates.to_id 
+      @dates = dates
+      @occupancy = occupancy
+    end
+
+    def total_price 
+        return @occupancy.sum { |occupancy| occupancy[:room].price * @dates.nights_spent }
+    end
+
+  end
+end
diff --git a/lib/reservation_manager.rb b/lib/reservation_manager.rb
new file mode 100644
index 000000000..8b38b929c
--- /dev/null
+++ b/lib/reservation_manager.rb
@@ -0,0 +1,67 @@
+require 'time'
+
+require_relative 'room'
+require_relative 'reservation'
+
+module Hotel
+  class ReservationManager
+    attr_reader :rooms, :reservations
+
+    def initialize(room_count)
+      @rooms = generate_rooms(room_count)
+      @reservations = []
+    end
+
+    # Parameters: 
+    # -type: symbol (:SINGLE, :BLOCK) that indicates type of reservation
+    # -range: DateRange object 
+    # -occupancy: Hash or String
+    # Returns: newly created Reservation object
+    def create_reservation(type, range, occupancy)
+      raise ArgumentError.new("Invalid reservation type (given #{type}, must be :SINGLE or :BLOCK)") unless 
+        type == :SINGLE || type == :BLOCK
+
+      occupancy = [{:room => @rooms.sample, :guest => occupancy}] if occupancy.class == String
+
+      new_reservation = Reservation.new(type, range, occupancy)
+      @reservations << new_reservation
+      return new_reservation
+    end
+
+    # Parameters: Date object 
+    # Returns: an Array of all Reservation instances that contain that date
+    def find_reservations_by_date(check_in, check_out)
+      by_date = @reservations.select { |reservation| reservation.dates.overlap?(check_in, check_out)}
+    end
+
+    def find_reservations_by_room(room)
+      by_room = @reservations.select { |reservation| reservation.occupancy.detect { |occupancy| occupancy[:room] == room }}
+    end
+
+    def list_all_available(check_in, check_out)
+      reserved = find_reservations_by_date(check_in, check_out)
+
+      if reserved.length > 0
+        occupancies = reserved.map { |reservation| reservation.occupancy }
+        occupied_rooms = occupancies.flatten
+        occupied_rooms_ids = occupied_rooms.map { |occupancy| occupancy[:room].id }
+      end
+
+      rooms = @rooms.map { |room| room.id }
+
+      return (rooms - occupied_rooms_ids)
+      
+    end
+
+    private 
+
+    def generate_rooms(room_count)
+      rooms = []
+      room_count.times do |num|
+        rooms << Room.new(num+1)
+      end
+      return rooms
+    end
+
+  end
+end
\ No newline at end of file
diff --git a/lib/room.rb b/lib/room.rb
new file mode 100644
index 000000000..4f3771ae1
--- /dev/null
+++ b/lib/room.rb
@@ -0,0 +1,12 @@
+module Hotel
+  class Room
+    attr_reader :id, :price, :type
+
+    def initialize(id)
+      @id = id.to_s
+      @price = 200
+      @type = "standard"
+    end
+  end
+
+end
\ No newline at end of file
diff --git a/test/date_range_test.rb b/test/date_range_test.rb
new file mode 100644
index 000000000..50c650704
--- /dev/null
+++ b/test/date_range_test.rb
@@ -0,0 +1,28 @@
+require_relative 'test_helper'
+
+describe "DateRange class" do
+  describe "initialize" do
+
+    before do
+      @dates = Hotel::DateRange.new(Date.new, Date.new + 2)
+    end
+
+    it "creates an instance of DateRange" do
+      expect(@dates).must_be_kind_of Hotel::DateRange
+    end
+
+    it "raises an error for invalid dates" do
+      expect{(Hotel::DateRange.new(Date.new+2, Date.new))}.must_raise ArgumentError
+    end
+
+    it "returns accurate count of nights spent" do
+      expect(@dates.nights_spent).must_equal 2
+    end
+
+    it "returns accurate start Date" do
+      expect(@dates.check_in).must_be_kind_of Date
+    end
+
+  end
+
+end
\ No newline at end of file
diff --git a/test/reservation_manager_test.rb b/test/reservation_manager_test.rb
new file mode 100644
index 000000000..298fc95cc
--- /dev/null
+++ b/test/reservation_manager_test.rb
@@ -0,0 +1,122 @@
+require_relative 'test_helper'
+
+describe "ReservationManager class" do
+  before do 
+    @reservation_manager = Hotel::ReservationManager.new(20)
+  end
+  
+  describe "Initializer" do
+    it "is an instance of ReservationManager" do
+      expect(@reservation_manager).must_be_kind_of Hotel::ReservationManager
+    end
+
+    it "initializes correct number of rooms" do
+      expect(@reservation_manager.rooms.length).must_equal 20
+    end
+
+    it "populates valid room objects" do
+      expect(@reservation_manager.rooms[1]).must_be_kind_of Hotel::Room
+    end
+
+    it "initializes with zero reservations" do
+      expect(@reservation_manager.reservations.length).must_equal 0
+    end
+
+    it "manages a hotel with 0 rooms" do
+      reservation_manager = Hotel::ReservationManager.new(0)
+      expect(reservation_manager.rooms.length).must_equal 0
+
+    end
+  end
+
+  describe "create reservation" do
+    before do
+      @room = Hotel::Room.new(100)
+      @occupancy = [{:room => @room, :guest => "Picchu"}]
+      @date = Hotel::DateRange.new(Date.new, Date.new + 2)
+      @reservation = @reservation_manager.create_reservation(:SINGLE, @date, @occupancy)
+    end
+
+    it "creates an instance of Reservation object" do
+      expect(@reservation).must_be_kind_of Hotel::Reservation
+    end
+
+    it "creates valid objects inside of a Reservation" do
+      expect(@reservation.occupancy).must_be_kind_of Array
+    end
+
+  end
+
+  describe "find_reservations_by_date" do
+    before do
+      date = Hotel::DateRange.new(Date.new, Date.new + 2)
+      @reservation_manager.create_reservation(:SINGLE, date, [{:room => Hotel::Room.new(100), :guest => "Elvy"}])
+      @reservation_manager.create_reservation(:SINGLE, date, [{:room => Hotel::Room.new(200), :guest => "Picchu"}] )
+    end
+
+    it "has accurate number of reservations" do
+      expect(@reservation_manager.reservations.length).must_equal 2
+    end
+
+    it "finds all reservations for a date" do
+      results = @reservation_manager.find_reservations_by_date(Date.new, Date.new + 3)
+      expect(results).must_be_kind_of Array
+      expect(results.length).must_equal 2
+      expect(results[0]).must_be_kind_of Hotel::Reservation
+      expect(results[0].occupancy).must_be_kind_of Array
+      expect(results[0].occupancy[0]).must_be_kind_of Hash
+      expect(results[0].occupancy[0][:room]).must_be_kind_of Hotel::Room
+      expect(results[0].occupancy[0][:room].id).must_equal "100"
+      expect(results[0].occupancy[0][:guest]).must_equal "Elvy"
+
+    end
+  end
+
+  describe "find_by_room" do
+    before do
+      @room = Hotel::Room.new(100)
+      @reservation_manager.create_reservation(
+        :SINGLE, 
+        Hotel::DateRange.new(Date.new + 5, Date.new + 10), 
+        [{:room => @room, :guest => "Picchu"}]
+      )
+      @reservation_manager.create_reservation(
+        :SINGLE, 
+        Hotel::DateRange.new(Date.new + 11, Date.new + 15), 
+        [{:room => @room, :guest => "Elvy"}]
+      )
+      @reservation_manager.create_reservation(
+        :SINGLE, 
+        Hotel::DateRange.new(Date.new + 16, Date.new + 18), 
+        [{:room => @room, :guest => "Tater Tot"}]
+      )
+      @reservation_manager.create_reservation(
+        :BLOCK, 
+        Hotel::DateRange.new(Date.new + 19, Date.new + 23), 
+        [{:room => Hotel::Room.new(300), :guest => "Peaches"},{:room => @room, :guest => "Tater Tot"},{:room => Hotel::Room.new(200), :guest => "Finn"}]
+      )
+    end
+
+    it "finds all reservations for a given room" do
+      results = @reservation_manager.find_reservations_by_room(@room)
+      expect(results).must_be_kind_of Array
+      expect(results.length).must_equal 4
+      expect(results.all? {|result| result.class == Hotel::Reservation}).must_equal true
+    end
+  end
+
+  describe "list_all_available" do
+    before do
+      date = Hotel::DateRange.new(Date.new, Date.new + 2)
+      @reservation_manager.create_reservation(:SINGLE, date, [{:room => @reservation_manager.rooms[0], :guest => "Elvy"}])
+      @reservation_manager.create_reservation(:SINGLE, date, [{:room => @reservation_manager.rooms[1], :guest => "Picchu"}] )
+      @reservation_manager.create_reservation(:SINGLE, date, [{:room => @reservation_manager.rooms[2], :guest => "Brom"}] )
+    end
+
+    it "returns list of available rooms for a given date range" do
+      results = @reservation_manager.list_all_available(Date.new, Date.new + 2)
+      expect(results.length).must_equal 17
+    end
+
+  end
+end
diff --git a/test/reservation_test.rb b/test/reservation_test.rb
new file mode 100644
index 000000000..73d2664d8
--- /dev/null
+++ b/test/reservation_test.rb
@@ -0,0 +1,34 @@
+require_relative 'test_helper'
+
+describe "Reservation class" do
+  before do
+    @date = Hotel::DateRange.new(Date.new, Date.new + 2)
+    @occupancy = [{:room => Hotel::Room.new(12), :guest => "Picchu"}]
+    @reservation = Hotel::Reservation.new(:SINGLE, @date, @occupancy)
+  end
+  
+  describe "initializer" do
+
+    it "creates a valid Reservation" do
+      expect(@reservation.id).must_be_kind_of String
+      expect(@reservation.dates).must_be_kind_of Hotel::DateRange
+    end
+    
+  end
+
+  describe "total_price" do
+
+    it "calculates total price on single room" do
+      expect(@reservation.total_price).must_equal (400) 
+    end 
+
+    it "calculates total price of a block" do
+      occupancy = [{:room => Hotel::Room.new(12), :guest => "Picchu"},{:room => Hotel::Room.new(14), :guest => "Elvy"}]
+      reservation = Hotel::Reservation.new(:BLOCK, @date, occupancy)
+
+      expect(reservation.total_price).must_equal (800)
+    end
+
+  end
+  
+end
\ No newline at end of file
diff --git a/test/room_test.rb b/test/room_test.rb
new file mode 100644
index 000000000..ced612872
--- /dev/null
+++ b/test/room_test.rb
@@ -0,0 +1,24 @@
+require_relative 'test_helper'
+
+describe "Room class" do
+  before do
+    @room = Hotel::Room.new(1)
+  end
+
+  describe "initialize" do
+    it "creates a valid room object" do
+      expect(@room).must_be_kind_of Hotel::Room
+    end
+  end
+
+  describe "Room methods" do
+    it "sets price to 200" do
+      expect(@room.price).must_equal 200
+    end
+
+    it "gives room a default type" do
+      expect(@room.type).must_equal "standard"
+    end
+  end
+
+end
\ No newline at end of file
diff --git a/test/test_helper.rb b/test/test_helper.rb
index c3a7695cf..1010d7f14 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,4 +1,8 @@
-# Add simplecov
+require 'simplecov'
+SimpleCov.start do
+  add_filter 'test/' # Tests should not be checked for coverage.
+end
+
 require "minitest"
 require "minitest/autorun"
 require "minitest/reporters"
@@ -6,3 +10,8 @@
 Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
 
 # require_relative your lib files here!
+require_relative "../lib/reservation_manager.rb"
+require_relative "../lib/room.rb"
+require_relative "../lib/reservation.rb"
+require_relative "../lib/date_range.rb"
+