test/*: compatibility class for both minitest 4 and 5

This is to avoid annoying deprecation warnings in minitest 5, while
still preserving compatibility with minitest 4 (which is distributed
in Ruby 2.0.0 and part of the standard library).

1 files changed, 1 insertions, 1 deletions

diff --git a/test/test_buffer.rb b/test/test_buffer.rb
index 259cd4f..677ca62 100644
--- a/test/test_buffer.rb
+++ b/test/test_buffer.rb
@@ -4,7 +4,7 @@ require './test/helper'
 require 'stringio'
 require 'dtas/buffer'
 
-class TestBuffer < Minitest::Unit::TestCase
+class TestBuffer < Testcase
   def teardown
     @to_close.each { |io| io.close unless io.closed? }
   end