start to calculate total amount of cart

5 files changed, 46 insertions, 6 deletions

diff --git a/lib/cart.rb b/lib/cart.rb
index 1bfe562..20cd3a5 100644
--- a/lib/cart.rb
+++ b/lib/cart.rb
@@ -20,4 +20,8 @@ class Cart
   def total_items
     @items.count
   end
+
+  def total_cost
+    Money.new(0.00)
+  end
 end
diff --git a/lib/money.rb b/lib/money.rb
new file mode 100644
index 0000000..b8ae962
--- /dev/null
+++ b/lib/money.rb
@@ -0,0 +1,11 @@
+class Money
+  attr_reader :amount
+
+  def initialize(amount)
+    @amount = amount
+  end
+
+  def ==(other)
+    @amount == other.amount
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7742723..abc988c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -3,3 +3,4 @@ require 'rspec-fakes'
 
 require_relative '../lib/cart.rb'
 require_relative '../lib/customer.rb'
+require_relative '../lib/money.rb'
diff --git a/spec/unit/cart_spec.rb b/spec/unit/cart_spec.rb
index c77ea34..c31f6d1 100644
--- a/spec/unit/cart_spec.rb
+++ b/spec/unit/cart_spec.rb
@@ -8,14 +8,20 @@ describe Cart do
   let(:laptop) { fake }
 
   context "when there are no items in the cart"  do
-    let(:result) { sut.includes?(crayons) }
+    it "should indicate that no items are included" do
+      sut.includes?(crayons).should be_false
+    end
+
+    it "should indicate that there are no items in the cart" do
+      sut.total_items.should == 0
+    end
 
-    it "should return false" do
-      result.should be_false
+    it "should calculate a total cost of $0.00" do
+      sut.total_cost.should == Money.new(0.00)
     end
   end
 
-  context "when adding a product" do
+  context "when there is a single item in the cart" do
     before { sut.add(crayons) }
 
     it "should increase the quanity of that product" do
@@ -27,7 +33,7 @@ describe Cart do
     end
   end
 
-  context "when adding more then one of the same product" do
+  context "when there are multiples of a single product" do
     before :each do
       sut.add(crayons)
       sut.add(crayons)
@@ -42,7 +48,7 @@ describe Cart do
     end
   end
 
-  context "when adding different products" do
+  context "when there is multiple products" do
     before :each do
       sut.add(crayons)
       sut.add(phone)
diff --git a/spec/unit/money_spec.rb b/spec/unit/money_spec.rb
new file mode 100644
index 0000000..0120c60
--- /dev/null
+++ b/spec/unit/money_spec.rb
@@ -0,0 +1,18 @@
+require "spec_helper"
+
+describe Money do
+  context "when comparing money" do
+    context "when the amount is the same" do
+      it "should return true" do
+        Money.new(1.00).should == Money.new(1.00)
+        Money.new(10.00).should eq(Money.new(10.00))
+      end
+    end
+    context "when the amount is different" do
+      it "should return false" do
+        Money.new(1.00).should_not == Money.new(10.00)
+        Money.new(10.00).should_not eq(Money.new(1.00))
+      end
+    end
+  end
+end