Cart Challenge - All Tests Passing

item.rb

@@ -0,0 +1,49 @@
+class Item
+
+  attr_reader :name, :price
+
+  def initialize name, price
+    @name = name
+    @price = price
+  end
+
+end
+
+class Cart
+
+  def initialize tax=nil
+    @contents = []
+    if !tax.nil?
+      @tax_rate = tax[:tax_rate]
+    else
+      @tax_rate = tax
+    end
+  end
+
+  def add_item item
+    @contents.push(item)
+  end
+
+  def item_count
+    @contents.count
+  end
+
+  def contains? item
+    @contents.include?(item)
+  end
+
+  def tax_rate
+    @tax_rate || 10
+  end
+
+  def cost_before_tax
+    cbt = @contents.map { |c| c.price }
+    cbt.inject(:+).to_f
+  end
+
+  def cost_after_tax
+    tax = cost_before_tax * (tax_rate / 100.0)
+    cost_before_tax + tax
+  end
+
+end

tests.rb

@@ -1,5 +1,6 @@
 require 'minitest/autorun'
 require 'pry'
+require './item'
 
 class CartTest < MiniTest::Test
 
@@ -40,7 +41,6 @@ def test_carts_know_their_cost
   def test_carts_know_their_tax_rates
     cart = Cart.new
     assert_equal cart.tax_rate, 10
-
     special_cart = Cart.new({tax_rate: 20})
     assert_equal special_cart.tax_rate, 20
   end