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describe :weakmap_size, shared: true do
it "is correct" do
map = ObjectSpace::WeakMap.new
key1, key2 = %w[a b].map(&:upcase)
ref1, ref2 = %w[x y]
map.send(@method).should == 0
map[key1] = ref1
map.send(@method).should == 1
map[key1] = ref1
map.send(@method).should == 1
map[key2] = ref2
map.send(@method).should == 2
end
end
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