* test/ruby/envutil.rb (assert_no_memory_leak): new assertion to

check memory leak by invoking child ruby process and watch its
  memory size.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/-ext-/string/test_modify_expand.rb

@@ -4,26 +4,12 @@ require_relative '../../ruby/envutil'
 
 class Test_StringModifyExpand < Test::Unit::TestCase
   def test_modify_expand_memory_leak
-    before = after = nil
-    args = [
-      "--disable=gems", "-r-test-/string/string",
-      "-I"+File.expand_path("../../..", __FILE__),
-      "-rruby/memory_status",
-      "-e", <<-CMD
+    assert_no_memory_leak(["-r-test-/string/string"], <<-PRE, <<-CMD, "rb_str_modify_expand()")
       s=Bug::String.new
-      size=Memory::Status.new.size
-      puts size
+    PRE
+      size = $initial_size
       10.times{s.modify_expand!(size)}
       s.replace("")
-      puts Memory::Status.new.size
     CMD
-    ]
-    status = EnvUtil.invoke_ruby(args, "", true) do |in_p, out_p, err_p, pid|
-      before, after = out_p.readlines.map(&:to_i)
-      Process.wait(pid)
-      $?
-    end
-    assert_equal(true, status.success?)
-    assert_operator after.fdiv(before), :<, 2
   end
 end