20 lines
693 B
Crystal
20 lines
693 B
Crystal
require "spec"
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require "../src/fifo.cr"
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describe "FIFO" do
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it "add and remove values" do
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fifo = FIFO(Int32).new 3 # Only 3 allowed entries.
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(fifo << 1).should be_nil # there is still room in the fifo
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(fifo << 2).should be_nil # there is still room in the fifo
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(fifo << 3).should be_nil # last entry without exceeding the allowed size
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(fifo << 4).should eq 1 # -> 1 (least recently used data)
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(fifo << 4).should be_nil # -> nil (already in the fifo)
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(fifo << 2).should be_nil # -> nil (already in the fifo)
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(fifo << 5).should eq 3 # -> 3 (least recently used data)
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fifo.data.should eq([5, 2, 4] of Int32)
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fifo.delete 2
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fifo.data.should eq([5, 4] of Int32)
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end
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end
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