Fix AS test suite.

activesupport/lib/active_support/tagged_logging.rb

@@ -40,6 +40,7 @@ module ActiveSupport
 
     def flush
       @tags.delete(Thread.current)
+      @logger.flush if @logger.respond_to?(:flush)
     end
 
     def method_missing(method, *args)

activesupport/test/buffered_logger_test.rb

@@ -43,6 +43,7 @@ class BufferedLoggerTest < Test::Unit::TestCase
 
   def test_write_binary_data_create_file
     fname = File.join Dir.tmpdir, 'lol', 'rofl.log'
+    FileUtils.mkdir_p File.dirname(fname)
     f = File.open(fname, 'w')
     f.binmode