Revert "Temporary pend unknown behavior of parallel tests"

This reverts commit 980f619, which
seems no longer needed.

Author: nobu

tool/test/testunit/test_parallel.rb

@@ -127,9 +127,7 @@ def test_done
 
         result = Marshal.load($1.chomp.unpack1("m"))
         assert_equal(5, result[0])
-        pend "TODO: result[1] returns 17. We should investigate it" do # TODO: misusage of pend (pend doens't use given block)
-          assert_equal(12, result[1])
-        end
+        assert_equal(12, result[1])
         assert_kind_of(Array,result[2])
         assert_kind_of(Array,result[3])
         assert_kind_of(Array,result[4])