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require 'spec_helper'
describe Ref::ReferenceQueue do
let(:queue) { Ref::ReferenceQueue.new }
let(:obj_1) { Object.new }
let(:obj_2) { Object.new }
let(:ref_1) { Ref::WeakReference.new(obj_1) }
let(:ref_2) { Ref::WeakReference.new(obj_2) }
describe '#push' do
context 'when the queue is empty' do
it { expect(queue.size).to be(0) }
it { expect(queue).to be_empty }
end
context 'when the queue is not empty' do
before do
queue.push(ref_1)
queue.push(ref_2)
end
it { expect(queue.size).to be(2) }
it { expect(queue).to_not be_empty }
end
end
describe '#shift' do
context 'when the queue is not empty' do
before do
queue.push(ref_1)
queue.push(ref_2)
end
it { expect(queue.shift).to be(ref_1) }
end
context 'when the queue is empty' do
it { expect(queue.shift).to be_nil }
end
end
describe '#pop' do
context 'when the queue is not empty' do
before do
queue.push(ref_1)
queue.push(ref_2)
end
it { expect(queue.pop).to be(ref_2) }
end
context 'when the queue is empty' do
it { expect(queue.pop).to be_nil }
end
end
context 'references are added immediately if the_object has been collected' do
specify do
Ref::Mock.use do
ref = Ref::WeakReference.new(obj_1)
Ref::Mock.gc(obj_1)
queue.monitor(ref)
expect(ref).to equal(queue.shift)
end
end
end
context 'references are added when the object has been collected' do
specify do
Ref::Mock.use do
ref = Ref::WeakReference.new(obj_1)
queue.monitor(ref)
result = queue.shift
expect(result).to eq nil
Ref::Mock.gc(obj_1)
object = queue.shift
expect(ref.referenced_object_id).to eq object.referenced_object_id
end
end
end
end
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