1require "spec_helper"
 2
 3module Nasty
 4  describe IdentityMap do
 5    let(:sut) { IdentityMap.new }
 6
 7    context "when an item is added" do
 8      let(:item) { Item.new(:id => 187) }
 9
10      before { sut.add(item) }
11
12      it "indicates that an item with that id is available" do
13        sut.has_item_for?(item.id).should be_true
14      end
15
16      it "loads the item" do
17        sut.item_for(item.id).should == item
18      end
19
20      context "when an item is evicted" do
21        before { sut.evict(item) }
22
23        it "indicates that it does not have an item for the evicted id" do
24          sut.has_item_for?(item.id).should be_false
25        end
26
27        it "returns nothing" do
28          sut.item_for(item.id).should be_nil
29        end
30      end
31    end
32
33    context "when no items have been added" do
34      it "indicates that it does not have any items for any id" do
35        (0..10).each do |i|
36          sut.has_item_for?(i).should be_false
37        end
38      end
39    end
40
41    class Item
42      attr_reader :id
43
44      def initialize(attributes)
45        @id = attributes[:id]
46      end
47    end
48  end
49end