42 lines
1.2 KiB
Crystal
42 lines
1.2 KiB
Crystal
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require "spec"
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require "./db-cars.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 stack
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(fifo << 2).should be_nil # there is still room in the stack
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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 stack)
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(fifo << 2).should be_nil # -> nil (already in the stack)
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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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end
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end
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describe "SPECDB::FIFO" do
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it "basics, 3 values" do
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car0 = Car.new "Corvet-0", "red", [] of String
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car1 = Car.new "Corvet-1", "red", [] of String
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car2 = Car.new "Corvet-2", "red", [] of String
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car3 = Car.new "Corvet-3", "red", [] of String
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db = SPECDB::FIFO(Car).new("", 3)
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db.data.keys.sort.should eq([] of Int32)
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db << car0
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db.data.keys.sort.should eq([0] of Int32)
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db << car1
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db.data.keys.sort.should eq([0, 1] of Int32)
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db << car2
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db.data.keys.sort.should eq([0, 1, 2] of Int32)
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db << car3
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db.data.keys.sort.should eq([1, 2, 3] of Int32)
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end
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end
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