Fix local_file target result unstable.

Flush before move to file from tempfile.
Fix #139

lib/tumugi/atomic_file.rb

@@ -7,7 +7,7 @@ class AtomicFile
     def_delegators :@temp_file,
       :bin_mode?, :print, :printf, :putc, :puts, :write,
       :seek, :set_encoding, :sync, :sync=, :sysseek,
-      :syswrite, :write, :write_nonblock
+      :syswrite, :write, :write_nonblock, :flush
 
     def initialize(path)
       @path = path
@@ -30,6 +30,7 @@ def open(&block)
 
     def close
       if @temp_file
+        @temp_file.flush
         move_to_final_destination(@temp_file)
         @temp_file.close
         @temp_file = nil

test/plugin/target/local_file_test.rb

@@ -47,15 +47,18 @@ class Tumugi::Plugin::LocalFileTargetTest < Test::Unit::TestCase
     sub_test_case 'write' do
       test 'with block' do
         @target.open('w') do |f|
-          f.print 'done'
+          10000.times.each do
+            f.puts 'done'
+          end
         end
         assert_true(@target.exist?)
-        assert_equal('done', File.read(@target.path))
+        assert_equal("done\n"*10000, File.read(@target.path))
       end
 
       test 'without block' do
         f = @target.open('w')
         f.print 'done'
+        f.flush
         f.close
         assert_equal('done', File.read(@target.path))
       end