Added Memoizable mixin for caching simple lazy loaded attributes

1 files changed, 45 insertions, 0 deletions

diff --git a/activesupport/test/memoizable_test.rb b/activesupport/test/memoizable_test.rb
new file mode 100644
index 0000000000..40a02cf253
--- /dev/null
+++ b/activesupport/test/memoizable_test.rb
@@ -0,0 +1,45 @@
+require 'abstract_unit'
+
+uses_mocha 'Memoizable' do
+  class MemoizableTest < Test::Unit::TestCase
+    class Person
+      include ActiveSupport::Memoizable
+
+      def name
+        fetch_name_from_floppy
+      end
+      memorize :name
+
+      def age
+        nil
+      end
+      memorize :age
+
+      private
+        def fetch_name_from_floppy
+          "Josh"
+        end
+    end
+
+    def test_memoization
+      person = Person.new
+      assert_equal "Josh", person.name
+
+      person.expects(:fetch_name_from_floppy).never
+      2.times { assert_equal "Josh", person.name }
+    end
+
+    def test_memoized_methods_are_frozen
+      person = Person.new
+      person.freeze
+      assert_equal "Josh", person.name
+      assert_equal true, person.name.frozen?
+    end
+
+    def test_memoization_frozen_with_nil_value
+      person = Person.new
+      person.freeze
+      assert_equal nil, person.age
+    end
+  end
+end