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require_relative '../../spec_helper'
require 'objspace'
describe "ObjectSpace.reachable_objects_from" do
it "returns nil for true and false" do
ObjectSpace.reachable_objects_from(true).should == nil
ObjectSpace.reachable_objects_from(false).should == nil
end
it "returns nil for nil" do
ObjectSpace.reachable_objects_from(nil).should == nil
end
it "returns nil for small Integers" do
ObjectSpace.reachable_objects_from(42).should == nil
end
it "enumerates objects directly reachable from a given object" do
ObjectSpace.reachable_objects_from(['a', 'b', 'c']).should include(Array, 'a', 'b', 'c')
ObjectSpace.reachable_objects_from(Object.new).should == [Object]
end
it "finds an object stored in an Array" do
obj = Object.new
ary = [obj]
reachable = ObjectSpace.reachable_objects_from(ary)
reachable.should include(obj)
end
it "finds an object stored in a copy-on-write Array" do
removed = Object.new
obj = Object.new
ary = [removed, obj]
ary.shift
reachable = ObjectSpace.reachable_objects_from(ary)
reachable.should include(obj)
reachable.should_not include(removed)
end
it "finds an object stored in a Queue" do
o = Object.new
q = Queue.new
q << o
reachable = ObjectSpace.reachable_objects_from(q)
reachable = reachable + reachable.flat_map { |r| ObjectSpace.reachable_objects_from(r) }
reachable.should include(o)
end
it "finds an object stored in a SizedQueue" do
o = Object.new
q = SizedQueue.new(3)
q << o
reachable = ObjectSpace.reachable_objects_from(q)
reachable = reachable + reachable.flat_map { |r| ObjectSpace.reachable_objects_from(r) }
reachable.should include(o)
end
end
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