diff --git a/test/test_connection.rb b/test/test_connection.rb
new file mode 100644
index 0000000..eea0ae7
--- /dev/null
+++ b/test/test_connection.rb
@@ -0,0 +1,20 @@
+require_relative './helper'
+require 'yaml'
+
+Elasticsearch = Embulk::Input::Elasticsearch
+
+module Embulk
+  class Input::Elasticsearch
+    class TestConnection < Test::Unit::TestCase
+      sub_test_case "connection" do
+        def test_normal
+
+        end
+
+        def test_error
+
+        end
+      end
+    end
+  end
+end
diff --git a/test/test_converter.rb b/test/test_converter.rb
index a97a034..d28006e 100644
--- a/test/test_converter.rb
+++ b/test/test_converter.rb
@@ -46,6 +46,36 @@ def test_normal
           assert_equal Converter.get_sources(results, fields), [["AVTCxiCuNR-BVKOgUB7R", 1, "dummy title"]]
         end
       end
+
+      sub_test_case "convert_value" do
+        def test_string
+
+        end
+
+        def test_long
+
+        end
+
+        def test_double
+
+        end
+
+        def test_timestamp
+
+        end
+
+        def test_json
+
+        end
+
+        def test_boolean
+
+        end
+
+        def test_typecast_error
+
+        end
+      end
     end
   end
 end