dodb.cr/spec/test-fifo.cr

55 lines
1.7 KiB
Crystal

require "spec"
require "../src/fifo.cr"
describe "FIFO" do
it "add and remove values" do
fifo = FIFO(Int32).new 3 # Only 3 allowed entries.
(fifo << 1).should be_nil # there is still room in the fifo
(fifo << 2).should be_nil # there is still room in the fifo
(fifo << 3).should be_nil # last entry without exceeding the allowed size
(fifo << 4).should eq 1 # -> 1 (least recently used data)
(fifo << 4).should be_nil # -> nil (already in the fifo)
(fifo << 2).should be_nil # -> nil (already in the fifo)
(fifo << 5).should eq 3 # -> 3 (least recently used data)
fifo.data.should eq([5, 2, 4] of Int32)
fifo.delete 2
fifo.data.should eq([5, 4] of Int32)
end
end
describe "EfficientFIFO" do
it "add and remove values" do
fifo = EfficientFIFO(Int32).new 3 # Only 3 allowed entries.
(fifo << 1).should be_nil # there is still room in the fifo
(fifo << 2).should be_nil # there is still room in the fifo
(fifo << 3).should be_nil # last entry without exceeding the allowed size
(fifo << 4).should eq 1 # -> 1 (least recently used data)
(fifo << 4).should be_nil # -> nil (already in the fifo)
(fifo << 2).should be_nil # -> nil (already in the fifo)
(fifo << 5).should eq 3 # -> 3 (least recently used data)
fifo.list.to_s.should eq "[ 5, 2, 4 ]"
fifo.delete 2
fifo.list.to_s.should eq "[ 5, 4 ]"
(fifo << 4).should be_nil # -> nil (just a re-order)
fifo.list.to_s.should eq "[ 4, 5 ]"
fifo.delete 5
(fifo << 0).should be_nil
fifo.list.to_s.should eq "[ 0, 4 ]"
(fifo << 1).should be_nil
fifo.list.to_s.should eq "[ 1, 0, 4 ]"
fifo.delete 4
fifo.list.to_s.should eq "[ 1, 0 ]"
fifo.delete 4
fifo.list.to_s.should eq "[ 1, 0 ]"
fifo.list.size.should eq 2
fifo.hash.size.should eq 2
end
end