Add a handful of cache store tests

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8764 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/cache.rb

@@ -1,3 +1,5 @@
+require 'benchmark'
+
 module ActiveSupport
   module Cache
     def self.lookup_store(*store_option)

activesupport/test/caching_test.rb

@@ -25,3 +25,29 @@ class CacheStoreSettingTest < Test::Unit::TestCase
     assert_equal "/path/to/cache/directory", store.cache_path
   end
 end
+
+uses_mocha 'high-level cache store tests' do
+  class CacheStoreTest < Test::Unit::TestCase
+    def setup
+      @cache = ActiveSupport::Cache.lookup_store(:memory_store)
+    end
+
+    def test_fetch_without_cache_miss
+      @cache.stubs(:read).with('foo', {}).returns('bar')
+      @cache.expects(:write).never
+      assert_equal 'bar', @cache.fetch('foo') { 'baz' }
+    end
+
+    def test_fetch_with_cache_miss
+      @cache.stubs(:read).with('foo', {}).returns(nil)
+      @cache.expects(:write).with('foo', 'baz', {})
+      assert_equal 'baz', @cache.fetch('foo') { 'baz' }
+    end
+
+    def test_fetch_with_forced_cache_miss
+      @cache.expects(:read).never
+      @cache.expects(:write).with('foo', 'bar', :force => true)
+      @cache.fetch('foo', :force => true) { 'bar' }
+    end
+  end
+end