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118 lines
2.8 KiB
Ruby
118 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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describe Pry::Ring do
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subject(:ring) { described_class.new(3) }
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describe "#<<" do
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it "adds elements as is when the ring is not full" do
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ring << 1 << 2 << 3
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expect(ring.to_a).to eq([1, 2, 3])
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end
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it "overwrites elements when the ring is full" do
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ring << 1 << 2 << 3 << 4 << 5
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expect(ring.to_a).to eq([3, 4, 5])
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end
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it "keeps duplicate elements" do
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ring << 1 << 1 << 1 << 1
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expect(ring.to_a).to eq([1, 1, 1])
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end
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end
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describe "#[]" do
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context "when the ring is empty" do
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it "returns nil" do
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expect(ring[0]).to be_nil
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end
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end
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context "when the ring is not full" do
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subject(:ring) { described_class.new(100) }
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before { ring << 1 << 2 << 3 }
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it "reads elements" do
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expect(ring[0]).to eq(1)
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expect(ring[1]).to eq(2)
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expect(ring[2]).to eq(3)
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expect(ring[-1]).to eq(3)
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expect(ring[-2]).to eq(2)
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expect(ring[-3]).to eq(1)
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end
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it "reads elements via range" do
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expect(ring[1..2]).to eq([2, 3])
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expect(ring[-2..-1]).to eq([2, 3])
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end
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end
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context "when the ring is full" do
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before { ring << 1 << 2 << 3 << 4 << 5 }
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it "reads elements" do
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expect(ring[0]).to eq(3)
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expect(ring[1]).to eq(4)
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expect(ring[2]).to eq(5)
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expect(ring[-1]).to eq(5)
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expect(ring[-2]).to eq(4)
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expect(ring[-3]).to eq(3)
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end
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it "returns the first element when accessed through 0..0" do
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expect(ring[0..0]).to eq([3])
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end
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it "reads elements via inclusive range" do
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expect(ring[1..2]).to eq([4, 5])
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expect(ring[-2..-1]).to eq([4, 5])
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expect(ring[-2..3]).to eq([4, 5])
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expect(ring[0..-1]).to eq([3, 4, 5])
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expect(ring[2..-1]).to eq([5])
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expect(ring[-1..10]).to eq([5])
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expect(ring[-1..0]).to eq([])
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expect(ring[-1..1]).to eq([])
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end
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it "reads elements via exclusive range" do
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expect(ring[1...2]).to eq([4])
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expect(ring[-2...-1]).to eq([4])
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expect(ring[-2...3]).to eq([4, 5])
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expect(ring[0...-1]).to eq([3, 4])
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expect(ring[2...-1]).to eq([])
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expect(ring[-1...10]).to eq([5])
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expect(ring[-1...0]).to eq([])
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expect(ring[-1...1]).to eq([])
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end
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end
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end
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describe "#to_a" do
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it "returns a duplicate of internal buffer" do
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array = ring.to_a
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ring << 1
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expect(array.count).to eq(0)
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expect(ring.count).to eq(1)
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end
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end
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describe "#clear" do
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it "resets ring to initial state" do
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ring << 1
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expect(ring.count).to eq(1)
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expect(ring.to_a).to eq([1])
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ring.clear
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expect(ring.count).to eq(0)
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expect(ring.to_a).to eq([])
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end
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end
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end
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