Removed rubinius support from test suite

tool/lib/test/unit/testcase.rb

@@ -36,13 +36,6 @@ module Test
         /^ruby/ =~ platform
       end
 
-      ##
-      # Is this running on rubinius?
-
-      def rubinius? platform = defined?(RUBY_ENGINE) && RUBY_ENGINE
-        "rbx" == platform
-      end
-
       ##
       # Is this running on windows?
 

tool/test/testunit/test_minitest_unit.rb

@@ -1417,11 +1417,6 @@ class TestMiniTestGuard < Test::Unit::TestCase
     assert self.jruby? "java"
   end
 
-  def test_rubinius_eh
-    assert self.class.rubinius? "rbx"
-    assert self.rubinius? "rbx"
-  end
-
   def test_windows_eh
     assert self.class.windows? "mswin"
     assert self.windows? "mswin"