55 lines
1.7 KiB
Crystal
55 lines
1.7 KiB
Crystal
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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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describe "EfficientFIFO" do
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it "add and remove values" do
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fifo = EfficientFIFO(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.list.to_s.should eq "[ 5, 2, 4 ]"
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fifo.delete 2
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fifo.list.to_s.should eq "[ 5, 4 ]"
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(fifo << 4).should be_nil # -> nil (just a re-order)
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fifo.list.to_s.should eq "[ 4, 5 ]"
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fifo.delete 5
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(fifo << 0).should be_nil
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fifo.list.to_s.should eq "[ 0, 4 ]"
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(fifo << 1).should be_nil
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fifo.list.to_s.should eq "[ 1, 0, 4 ]"
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fifo.delete 4
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fifo.list.to_s.should eq "[ 1, 0 ]"
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fifo.delete 4
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fifo.list.to_s.should eq "[ 1, 0 ]"
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fifo.list.size.should eq 2
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fifo.hash.size.should eq 2
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end
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end
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