105 lines
2.3 KiB
Crystal
105 lines
2.3 KiB
Crystal
describe Lifo::Queue do
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describe "#initialize" do
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it "sets capacity to -1 if none is given" do
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queue = Lifo::Queue(Int32).new
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queue.capacity.should eq -1
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end
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end
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describe "#enqueue" do
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it "enqueues to the queue" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue(1)
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queue.peek.should eq(1)
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queue.enqueue(3)
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queue.peek.should eq(1)
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queue.enqueue(5)
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queue.peek.should eq(1)
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end
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it "returns queue size" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue(1)
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queue.enqueue(3)
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queue.size.should eq(2)
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end
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it "raises OverflowError if queue is full" do
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queue = Lifo::Queue(Int32).new(0)
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expect_raises(Lifo::OverflowError) do
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queue.enqueue(1)
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end
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end
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it "doesn't raise an error when queue is infinite" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue(1)
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end
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end
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describe "#enqueue?" do
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it "enqueues to the queue" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue?(1)
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queue.peek.should eq(1)
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queue.enqueue?(3)
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queue.peek.should eq(1)
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queue.enqueue?(5)
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queue.peek.should eq(1)
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end
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it "returns queue size" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue?(1)
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queue.enqueue?(3)
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queue.size.should eq(2)
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end
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it "returns nil if error raised" do
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queue = Lifo::Queue(Int32).new(0)
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queue.enqueue?(1).should be_nil
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end
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end
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describe "#dequeue" do
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it "dequeues from the queue" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue(1)
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queue.enqueue(3)
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queue.peek.should eq(1)
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queue.dequeue
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queue.peek.should eq(3)
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queue.dequeue
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end
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it "returns dequeued element" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue(1)
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queue.enqueue(3)
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queue.peek.should eq(1)
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queue.dequeue.should eq(1)
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queue.dequeue.should eq(3)
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end
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it "raises UnderflowError if queue is empty" do
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queue = Lifo::Queue(Int32).new(0)
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expect_raises(Lifo::UnderflowError) do
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queue.dequeue
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end
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end
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end
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describe "#dequeue?" do
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it "dequeues from the queue" do
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queue = Lifo::Queue(Int32).new
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queue.enqueue(1)
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queue.enqueue(3)
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queue.peek.should eq(1)
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queue.dequeue?
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queue.peek.should eq(3)
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queue.dequeue?
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end
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end
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end
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