spec/kosher/snapshot_spec.rb in kosher-0.2.10 vs spec/kosher/snapshot_spec.rb in kosher-0.2.11

@@ -1,5 +1,71 @@
 require 'spec_helper'
 
 module Kosher
-  describe Snapshot
+  describe Snapshot do
+    describe "#best_kosher_offer" do
+      before do
+        @snapshot = Snapshot.new
+        @snapshot.offers = []
+
+        @offer1 = Offer.new
+        @offer2 = Offer.new
+      end
+
+      context "when there are more than one kosher offers" do
+        before do
+          @offer1.stub!(:kosher?).and_return(true)
+          @offer1.stub!(:price).and_return(Money.new(200, 'EUR'))
+          @snapshot.offers << @offer1
+
+          @offer2.stub!(:kosher?).and_return(true)
+          @offer2.stub!(:price).and_return(Money.new(100, 'EUR'))
+          @snapshot.offers << @offer2
+        end
+
+        it "returns the kosher offer with the lower price" do
+          @snapshot.best_kosher_offer.should eql @offer2
+        end
+      end
+
+      context "when there is one kosher and one unkosher offer" do
+        before do
+          @offer1.stub!(:kosher?).and_return(true)
+          @offer1.stub!(:price).and_return(Money.new(200, 'EUR'))
+          @snapshot.offers << @offer1
+
+          @offer2.stub!(:kosher?).and_return(false)
+          @offer2.stub!(:price).and_return(Money.new(100, 'EUR'))
+          @snapshot.offers << @offer2
+        end
+
+        it "returns the best kosher offer" do
+          @snapshot.best_kosher_offer.should eql @offer1
+        end
+      end
+
+      context "when there is one kosher offer" do
+        before do
+          @offer1.stub!(:kosher?).and_return(true)
+          @offer1.stub!(:price).and_return(Money.new(100, 'EUR'))
+          @snapshot.offers << @offer1
+        end
+
+        it "returns the kosher offer" do
+          @snapshot.best_kosher_offer.should eql @offer1
+        end
+      end
+
+      context "when there is one unkosher offer" do
+        before do
+          @offer1.stub!(:kosher?).and_return(false)
+          @offer1.stub!(:price).and_return(Money.new(100, 'EUR'))
+          @snapshot.offers << @offer1
+        end
+
+        it "returns nil" do
+          @snapshot.best_kosher_offer.should be_nil
+        end
+      end
+    end
+  end
 end