Add Buffer test

test/plugin/test_buffer.rb

@@ -1,6 +1,7 @@
 require_relative '../helper'
 require 'fluent/plugin/buffer'
 require 'fluent/plugin/buffer/memory_chunk'
+require 'fluent/plugin/buffer/compressable'
 require 'fluent/event'
 require 'flexmock/test_unit'
 
@@ -865,6 +866,10 @@ def create_chunk_es(metadata, es)
       assert{ @p.stage[@dm1].size == 2 }
       assert @p.stage[@dm1].rollbacked
     end
+
+    test '#compress returns false' do
+      assert !@p.compress
+    end
   end
 
   sub_test_case 'standard format with configuration for test with lower chunk limit size' do
@@ -1197,4 +1202,18 @@ def create_chunk_es(metadata, es)
     end
   end
 
+  sub_test_case 'with configuration compress is true' do |x|
+    test '#compress returns false' do
+      p = create_buffer({'compress' => true})
+      assert p.compress
+    end
+
+    test 'should extend BufferCompressable' do
+      p = create_buffer({'compress' => true})
+      chunk = p.generate_chunk(create_metadata)
+
+      assert p.singleton_class.ancestors.include?(Fluent::Plugin::Buffer::BufferCompressable)
+      assert chunk.singleton_class.ancestors.include?(Fluent::Plugin::Buffer::ChunkCompressable)
+    end
+  end
 end