add admin/auction_helper specs

spec/helpers/admin/auctions_helper_spec.rb

@@ -0,0 +1,28 @@
+require 'spec_helper'
+include ActionController::Streaming
+
+describe Admin::AuctionsHelper do
+  describe 'FINAL_PRICE_STRING' do
+    it 'should return nil when final_price is not set' do
+      auction = mock(Auction, :final_price => nil)
+      helper.final_price_string(auction).should be_nil
+    end
+
+    it 'should return a price string with currency and 2 decimals' do
+      auction = mock_model(Auction, :final_price => 10.2, :currency_id => 'Euro')
+      helper.final_price_string(auction).should == 'Euro 10.20'
+    end
+  end
+
+  describe 'RESULTS_FOR' do
+    it 'should return "no bids" when auction has no final price' do
+      auction = mock(Auction, :final_price => nil)
+      helper.results_for(auction).should == 'no bids'
+    end
+
+    it 'should return final_price_string when auction has a final price' do
+      auction = mock_model(Auction, :final_price => 10.2, :currency_id => 'Euro')
+      helper.results_for(auction).should == helper.final_price_string(auction)
+    end
+  end
+end