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require File.expand_path("../test_helper", __FILE__)
class TestWeakReference < Test::Unit::TestCase
def test_can_get_non_garbage_collected_objects
obj = Object.new
ref_1 = Ref::WeakReference.new(obj)
ref_2 = Ref::WeakReference.new(obj)
assert_equal obj, ref_1.object
assert_equal obj.object_id, ref_1.referenced_object_id
assert_equal obj, ref_2.object
assert_equal obj.object_id, ref_2.referenced_object_id
end
def test_get_the_correct_object
# Since we can't reliably control the garbage collector, this is a brute force test.
# It might not always fail if the garbage collector and memory allocator don't
# cooperate, but it should fail often enough on continuous integration to
# hilite any problems. Set the environment variable QUICK_TEST to "true" if you
# want to make the tests run quickly.
id_to_ref = {}
(ENV["QUICK_TEST"] == "true" ? 1000 : 100000).times do |i|
obj = Object.new
if id_to_ref.key?(obj.object_id)
ref = id_to_ref[obj.object_id]
if ref.object
flunk "weak reference found with a live reference to an object that was not the one it was created with"
break
end
end
%w(Here are a bunch of objects that are allocated and can then be cleaned up by the garbage collector)
id_to_ref[obj.object_id] = Ref::WeakReference.new(obj)
if i % 1000 == 0
GC.start
sleep(0.01)
end
end
end
def test_inspect
ref = Ref::WeakReference.new(Object.new)
assert ref.inspect
GC.start
GC.start
assert ref.inspect
end
end
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