Include all modules included into Test::Unit::TestCase

Some methods are separated into modules in test-unit now.

Author: nobu

test/lib/core_assertions.rb

@@ -260,6 +260,7 @@ def assert_ruby_status(args, test_stdin="", message=nil, **opt)
       ABORT_SIGNALS = Signal.list.values_at(*%w"ILL ABRT BUS SEGV TERM")
 
       def separated_runner(out = nil)
+        include(*Test::Unit::TestCase.ancestors.select {|c| !c.is_a?(Class) })
         out = out ? IO.new(out, 'w') : STDOUT
         at_exit {
           out.puts [Marshal.dump($!)].pack('m'), "assertions=\#{self._assertions}"