diff --git a/test.rb b/test.rb
index caa2b34..c2f80df 100755
--- a/test.rb
+++ b/test.rb
@@ -99,16 +99,20 @@ cmd :REGISTER_CATEGORY, :link
 ###################
 
 cmd :REGISTER_FORMAT, { name: :html,
-                        stdin: { notes: nil },
                         args: ['test/render.rb',
                                { template: nil },
-                               { format: nil }] }
+                               { format: nil }],
+                        stdin: ['{"notes":',
+                                { notes: nil },
+                                '}'] }
 
 cmd :REGISTER_FORMAT, { name: :json,
-                        stdin: { notes: nil },
                         args: ['test/render.rb',
                                { template: nil },
-                               { format: nil }] }
+                               { format: nil }],
+                        stdin: ['{"notes":',
+                                { notes: nil },
+                                '}'] }
 
 ################
 # REGISTER_REF #
diff --git a/test/render.rb b/test/render.rb
index 3f5dfcb..dd03544 100755
--- a/test/render.rb
+++ b/test/render.rb
@@ -12,6 +12,7 @@ def template(filename)
   end.freeze
 end
 
-puts template("#{ARGV[0]}.#{ARGV[1]}.erb").result_with_hash(
-  notes: JSON.parse($stdin.read),
-).strip
+name = "#{ARGV[0]}.#{ARGV[1]}.erb".freeze
+vars = JSON.parse($stdin.read).freeze
+
+puts template(name).result_with_hash(vars).strip