From: Joel VanderWerf <vjoel@...>
Date: 2007-10-28T15:23:04+09:00
Subject: Re: How fast does your Ruby run?

Charles Oliver Nutter wrote:
> In general, the tricky bit is that there's at least one key library in 
> stdlib that depends on ObjectSpace: test/unit, which uses it to locate 
> tests. However I've implemented in JRuby the ability to walk all child 
> classes from a parent class, which provides the each_object(Class) used 
> in test/unit.

The dependence on ObjectSpace is kind of nasty, isn't it? A library 
shouldn't use ObjectSpace in this way, because what it finds there may 
depend on whether GC has run recently or not.

Good to hear you found a way to support it anyway, though.

Does your mechanism to walk child classes prevent them from being 
collected, if there are no other references to them? If so, then it 
isn't quite bug-compatible (though it is unlikely to matter):

require 'test/unit'

def add_a_test_case str
   puts "adding test case #{str}"
   Class.new(Test::Unit::TestCase).class_eval do
     define_method :test_foo do
       puts "running test case #{str}"
     end
   end
end

at_exit { GC.start }
at_exit { add_a_test_case 1 }
at_exit { add_a_test_case 2 }
at_exit { add_a_test_case 3 }
at_exit { add_a_test_case 4 }

__END__

adding test case 4
adding test case 3
adding test case 2
adding test case 1
Loaded suite -
Started
running test case 1
.
Finished in 0.000918 seconds.

1 tests, 0 assertions, 0 failures, 0 errors

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407