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RSpec.shared_examples :priority_queue do
subject{ described_class.new }
context '#initialize' do
it 'sorts from high to low when :order is :max' do
subject = described_class.from_list([2, 1, 4, 5, 3, 0], order: :max)
expect(subject.pop).to eq 5
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
end
it 'sorts from high to low when :order is :high' do
subject = described_class.new(order: :high)
[2, 1, 4, 5, 3, 0].each{|item| subject << item }
expect(subject.pop).to eq 5
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
end
it 'sorts from low to high when :order is :min' do
subject = described_class.from_list([2, 1, 4, 5, 3, 0], order: :min)
expect(subject.pop).to eq 0
expect(subject.pop).to eq 1
expect(subject.pop).to eq 2
end
it 'sorts from low to high when :order is :low' do
subject = described_class.new(order: :low)
[2, 1, 4, 5, 3, 0].each{|item| subject << item }
expect(subject.pop).to eq 0
expect(subject.pop).to eq 1
expect(subject.pop).to eq 2
end
it 'sorts from high to low by default' do
subject = described_class.new
subject = described_class.from_list([2, 1, 4, 5, 3, 0])
expect(subject.pop).to eq 5
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
end
end
context '#clear' do
it 'removes all items from a populated queue' do
10.times{|i| subject << i}
subject.clear
expect(subject).to be_empty
end
it 'has no effect on an empty queue' do
subject.clear
expect(subject).to be_empty
end
specify { expect(subject.clear).to be_truthy }
end
context '#delete' do
it 'deletes the requested item when found' do
10.times{|item| subject << item }
subject.delete(5)
expect(subject.pop).to eq 9
expect(subject.pop).to eq 8
expect(subject.pop).to eq 7
expect(subject.pop).to eq 6
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
expect(subject.pop).to eq 2
expect(subject.pop).to eq 1
expect(subject.pop).to eq 0
end
it 'deletes the requested item when it is the first element' do
10.times{|item| subject << item }
subject.delete(9)
expect(subject.length).to eq 9
expect(subject.pop).to eq 8
expect(subject.pop).to eq 7
expect(subject.pop).to eq 6
expect(subject.pop).to eq 5
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
expect(subject.pop).to eq 2
expect(subject.pop).to eq 1
expect(subject.pop).to eq 0
end
it 'deletes the requested item when it is the last element' do
10.times{|item| subject << item }
subject.delete(2)
expect(subject.length).to eq 9
expect(subject.pop).to eq 9
expect(subject.pop).to eq 8
expect(subject.pop).to eq 7
expect(subject.pop).to eq 6
expect(subject.pop).to eq 5
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
expect(subject.pop).to eq 1
expect(subject.pop).to eq 0
end
it 'deletes multiple matching items when present' do
[2, 1, 2, 2, 2, 3, 2].each{|item| subject << item }
subject.delete(2)
expect(subject.pop).to eq 3
expect(subject.pop).to eq 1
end
it 'returns true when found' do
10.times{|i| subject << i}
expect(subject.delete(2)).to be_truthy
end
it 'returns false when not found' do
10.times{|i| subject << i}
expect(subject.delete(100)).to be_falsey
end
it 'returns false when called on an empty queue' do
expect(subject.delete(:foo)).to be_falsey
end
end
context '#empty?' do
it 'returns true for an empty queue' do
expect(subject).to be_empty
end
it 'returns false for a populated queue' do
10.times{|i| subject << i}
expect(subject).not_to be_empty
end
end
context '#include?' do
it 'returns true if the item is found' do
10.times{|i| subject << i}
expect(subject).to include(5)
end
it 'returns false if the item is not found' do
10.times{|i| subject << i}
expect(subject).not_to include(50)
end
it 'returns false when the queue is empty' do
expect(subject).not_to include(1)
end
it 'is aliased as #has_priority?' do
10.times{|i| subject << i}
expect(subject).to have_priority(5)
end
end
context '#length' do
it 'returns the length of a populated queue' do
10.times{|i| subject << i}
expect(subject.length).to eq 10
end
it 'returns zero when the queue is empty' do
expect(subject.length).to eq 0
end
it 'is aliased as #size' do
10.times{|i| subject << i}
expect(subject.size).to eq 10
end
end
context '#peek' do
it 'returns the item at the head of the queue' do
10.times{|i| subject << i}
expect(subject.peek).to eq 9
end
it 'does not remove the item from the queue' do
10.times{|i| subject << i}
subject.peek
expect(subject.length).to eq 10
expect(subject).to include(9)
end
it 'returns nil when the queue is empty' do
expect(subject.peek).to be_nil
end
end
context '#pop' do
it 'returns the item at the head of the queue' do
10.times{|i| subject << i}
expect(subject.pop).to eq 9
end
it 'removes the item from the queue' do
10.times{|i| subject << i}
subject.pop
expect(subject.length).to eq 9
expect(subject).not_to include(9)
end
it 'returns nil when the queue is empty' do
expect(subject.pop).to be_nil
end
it 'returns nil when called multiple times while empty' do
10.times do
expect(subject.pop).to be nil
end
end
it 'is aliased as #deq' do
10.times{|i| subject << i}
expect(subject.deq).to eq 9
end
it 'is aliased as #shift' do
10.times{|i| subject << i}
expect(subject.shift).to eq 9
end
end
context '#push' do
it 'raises an exception when attempting to enqueue nil' do
expect {
subject.push(nil)
}.to raise_error(ArgumentError)
end
it 'adds the item to the queue' do
subject.push(1)
expect(subject).to include(1)
end
it 'sorts the new item in priority order' do
3.times{|i| subject << i}
expect(subject.pop).to eq 2
expect(subject.pop).to eq 1
expect(subject.pop).to eq 0
end
it 'arbitrarily orders equal items with respect to each other' do
3.times{|i| subject << i}
subject.push(1)
expect(subject.pop).to eq 2
expect(subject.pop).to eq 1
expect(subject.pop).to eq 1
expect(subject.pop).to eq 0
end
specify { expect(subject.push(10)).to be_truthy }
it 'is aliased as <<' do
subject << 1
expect(subject).to include(1)
end
it 'is aliased as enq' do
subject.enq(1)
expect(subject).to include(1)
end
end
context '.from_list' do
it 'creates an empty queue from an empty list' do
subject = described_class.from_list([])
expect(subject).to be_empty
end
it 'creates a sorted, populated queue from an Array' do
subject = described_class.from_list([2, 1, 4, 5, 3, 0])
expect(subject.pop).to eq 5
expect(subject.pop).to eq 4
expect(subject.pop).to eq 3
expect(subject.pop).to eq 2
expect(subject.pop).to eq 1
expect(subject.pop).to eq 0
end
it 'creates a sorted, populated queue from a Hash' do
subject = described_class.from_list(two: 2, one: 1, three: 3, zero: 0)
expect(subject.length).to eq 4
end
end
end
module Concurrent
module Collection
RSpec.describe RubyNonConcurrentPriorityQueue do
it_should_behave_like :priority_queue
end
if Concurrent.on_jruby?
RSpec.describe JavaNonConcurrentPriorityQueue do
it_should_behave_like :priority_queue
end
end
RSpec.describe NonConcurrentPriorityQueue do
if Concurrent.on_jruby?
it 'inherits from JavaNonConcurrentPriorityQueue' do
expect(NonConcurrentPriorityQueue.ancestors).to include(JavaNonConcurrentPriorityQueue)
end
else
it 'inherits from RubyNonConcurrentPriorityQueue' do
expect(NonConcurrentPriorityQueue.ancestors).to include(RubyNonConcurrentPriorityQueue)
end
end
end
end
end
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