* No need to require test/unit in each testfile

ruby/t/tc_canvas.rb

@@ -1,4 +1,3 @@
-require 'test/unit'
 require 'caca'
 
 class TC_Canvas < Test::Unit::TestCase

ruby/t/tc_display.rb

@@ -1,4 +1,3 @@
-require 'test/unit'
 require 'caca'
 
 class TC_Canvas < Test::Unit::TestCase

ruby/t/tc_dither.rb

@@ -1,4 +1,3 @@
-require 'test/unit'
 require 'caca'
 
 class TC_Canvas < Test::Unit::TestCase

ruby/t/tc_font.rb

@@ -1,4 +1,3 @@
-require 'test/unit'
 require 'caca'
 
 class TC_Canvas < Test::Unit::TestCase

ruby/t/tc_frame.rb

@@ -1,4 +1,3 @@
-require 'test/unit'
 require 'caca'
 
 class TC_Frame < Test::Unit::TestCase