Skip tests that depend on memcached if not running.

Signed-off-by: Michael Koziarski <michael@koziarski.com>

activesupport/test/abstract_unit.rb

@@ -26,6 +26,16 @@ unless defined? uses_mocha
   end
 end
 
+unless defined? uses_memcached
+  def uses_memcached(test_name)
+    require 'memcache'
+    MemCache.new('localhost').stats
+    yield
+  rescue MemCache::MemCacheError
+    $stderr.puts "Skipping #{test_name} tests. Start memcached and try again."
+  end
+end
+
 # Show backtraces for deprecated behavior for quicker cleanup.
 ActiveSupport::Deprecation.debug = true
 
@@ -40,4 +50,4 @@ def with_kcode(code)
   else
     yield
   end
-end
+end

activesupport/test/caching_test.rb

@@ -146,26 +146,28 @@ class MemoryStoreTest < Test::Unit::TestCase
   end
 end
 
-class MemCacheStoreTest < Test::Unit::TestCase
-  def setup
-    @cache = ActiveSupport::Cache.lookup_store(:mem_cache_store)
-    @cache.clear
+uses_memcached 'memcached backed store' do
+  class MemCacheStoreTest < Test::Unit::TestCase
+    def setup
+      @cache = ActiveSupport::Cache.lookup_store(:mem_cache_store)
+      @cache.clear
+    end
+
+    include CacheStoreBehavior
+
+    def test_store_objects_should_be_immutable
+      @cache.write('foo', 'bar')
+      @cache.read('foo').gsub!(/.*/, 'baz')
+      assert_equal 'bar', @cache.read('foo')
+    end
   end
 
-  include CacheStoreBehavior
+  class CompressedMemCacheStore < Test::Unit::TestCase
+    def setup
+      @cache = ActiveSupport::Cache.lookup_store(:compressed_mem_cache_store)
+      @cache.clear
+    end
 
-  def test_store_objects_should_be_immutable
-    @cache.write('foo', 'bar')
-    @cache.read('foo').gsub!(/.*/, 'baz')
-    assert_equal 'bar', @cache.read('foo')
+    include CacheStoreBehavior
   end
 end
-
-class CompressedMemCacheStore < Test::Unit::TestCase
-  def setup
-    @cache = ActiveSupport::Cache.lookup_store(:compressed_mem_cache_store)
-    @cache.clear
-  end
-
-  include CacheStoreBehavior
-end