diff --git a/Rakefile b/Rakefile
index 5d512c8..d81dd1f 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,4 +7,11 @@ Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
+task :sync_tool do
+  require 'fileutils'
+  FileUtils.cp "../ruby/tool/lib/test/unit/core_assertions.rb", "./test/lib"
+  FileUtils.cp "../ruby/tool/lib/envutil.rb", "./test/lib"
+  FileUtils.cp "../ruby/tool/lib/find_executable.rb", "./test/lib"
+end
+
 task :default => :test
diff --git a/test/lib/core_assertions.rb b/test/lib/core_assertions.rb
index 39964d9..adb797b 100644
--- a/test/lib/core_assertions.rb
+++ b/test/lib/core_assertions.rb
@@ -194,7 +194,11 @@ def assert_nothing_raised(*args)
           end
           if ((args.empty? && !as) ||
               args.any? {|a| a.instance_of?(Module) ? e.is_a?(a) : e.class == a })
-            msg = message(msg) { "Exception raised:\n<#{mu_pp(e)}>" }
+            msg = message(msg) {
+              "Exception raised:\n<#{mu_pp(e)}>\n" +
+              "Backtrace:\n" +
+              e.backtrace.map{|frame| "  #{frame}"}.join("\n")
+            }
             raise MiniTest::Assertion, msg.call, bt
           else
             raise
@@ -287,6 +291,7 @@ def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **o
         args = args.dup
         args.insert((Hash === args.first ? 1 : 0), "-w", "--disable=gems", *$:.map {|l| "-I#{l}"})
         stdout, stderr, status = EnvUtil.invoke_ruby(args, src, capture_stdout, true, **opt)
+      ensure
         if res_c
           res_c.close
           res = res_p.read
@@ -294,6 +299,7 @@ def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **o
         else
           res = stdout
         end
+        raise if $!
         abort = status.coredump? || (status.signaled? && ABORT_SIGNALS.include?(status.termsig))
         assert(!abort, FailDesc[status, nil, stderr])
         self._assertions += res[/^assertions=(\d+)/, 1].to_i
@@ -450,6 +456,49 @@ def assert_raise_with_message(exception, expected, msg = nil, &block)
         ex
       end
 
+      # pattern_list is an array which contains regexp and :*.
+      # :* means any sequence.
+      #
+      # pattern_list is anchored.
+      # Use [:*, regexp, :*] for non-anchored match.
+      def assert_pattern_list(pattern_list, actual, message=nil)
+        rest = actual
+        anchored = true
+        pattern_list.each_with_index {|pattern, i|
+          if pattern == :*
+            anchored = false
+          else
+            if anchored
+              match = /\A#{pattern}/.match(rest)
+            else
+              match = pattern.match(rest)
+            end
+            unless match
+              msg = message(msg) {
+                expect_msg = "Expected #{mu_pp pattern}\n"
+                if /\n[^\n]/ =~ rest
+                  actual_mesg = +"to match\n"
+                  rest.scan(/.*\n+/) {
+                    actual_mesg << '  ' << $&.inspect << "+\n"
+                  }
+                  actual_mesg.sub!(/\+\n\z/, '')
+                else
+                  actual_mesg = "to match " + mu_pp(rest)
+                end
+                actual_mesg << "\nafter #{i} patterns with #{actual.length - rest.length} characters"
+                expect_msg + actual_mesg
+              }
+              assert false, msg
+            end
+            rest = match.post_match
+            anchored = true
+          end
+        }
+        if anchored
+          assert_equal("", rest)
+        end
+      end
+
       def assert_warning(pat, msg = nil)
         result = nil
         stderr = EnvUtil.with_default_internal(pat.encoding) {
diff --git a/test/lib/envutil.rb b/test/lib/envutil.rb
index 2faf483..0bd8bdb 100644
--- a/test/lib/envutil.rb
+++ b/test/lib/envutil.rb
@@ -86,7 +86,20 @@ def terminate(pid, signal = :TERM, pgroup = nil, reprieve = 1)
     when nil, false
       pgroup = pid
     end
+
+    lldb = true if /darwin/ =~ RUBY_PLATFORM
+
     while signal = signals.shift
+
+      if lldb and [:ABRT, :KILL].include?(signal)
+        lldb = false
+        # sudo -n: --non-interactive
+        # lldb -p: attach
+        #      -o: run command
+        system(*%W[sudo -n lldb -p #{pid} --batch -o bt\ all -o call\ rb_vmdebug_stack_dump_all_threads() -o quit])
+        true
+      end
+
       begin
         Process.kill signal, pgroup
       rescue Errno::EINVAL
@@ -100,6 +113,8 @@ def terminate(pid, signal = :TERM, pgroup = nil, reprieve = 1)
         begin
           Timeout.timeout(reprieve) {Process.wait(pid)}
         rescue Timeout::Error
+        else
+          break
         end
       end
     end
@@ -137,8 +152,10 @@ def invoke_ruby(args, stdin_data = "", capture_stdout = false, capture_stderr =
     args = [args] if args.kind_of?(String)
     pid = spawn(child_env, *precommand, rubybin, *args, **opt)
     in_c.close
-    out_c.close if capture_stdout
-    err_c.close if capture_stderr && capture_stderr != :merge_to_stdout
+    out_c&.close
+    out_c = nil
+    err_c&.close
+    err_c = nil
     if block_given?
       return yield in_p, out_p, err_p, pid
     else
@@ -242,7 +259,11 @@ def with_default_internal(enc)
 
   def labeled_module(name, &block)
     Module.new do
-      singleton_class.class_eval {define_method(:to_s) {name}; alias inspect to_s}
+      singleton_class.class_eval {
+        define_method(:to_s) {name}
+        alias inspect to_s
+        alias name to_s
+      }
       class_eval(&block) if block
     end
   end
@@ -250,7 +271,11 @@ def labeled_module(name, &block)
 
   def labeled_class(name, superclass = Object, &block)
     Class.new(superclass) do
-      singleton_class.class_eval {define_method(:to_s) {name}; alias inspect to_s}
+      singleton_class.class_eval {
+        define_method(:to_s) {name}
+        alias inspect to_s
+        alias name to_s
+      }
       class_eval(&block) if block
     end
   end