Invoices helper spec

spec/helpers/invoices_helper_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe InvoicesHelper do
+  describe "display_purchase" do
+    it "should display description of the purchase of the invoice" do
+      mock_purchase = stub_model(Purchase, :description => "a description")
+      mock_invoice = stub_model(Invoice, :purchase => mock_purchase)
+      helper.display_purchase(mock_invoice).should include "a description"
+    end
+
+    it "should display a default message if there is no purchase" do
+      mock_invoice = stub_model(Invoice, :purchase => nil)
+      helper.display_purchase(mock_invoice).should == "(no Purchase set)"
+    end
+  end
+end