50 lines
1.4 KiB
Crystal
50 lines
1.4 KiB
Crystal
require "spec"
|
|
require "./db-cars.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 stack
|
|
(fifo << 2).should be_nil # there is still room in the stack
|
|
(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 stack)
|
|
(fifo << 2).should be_nil # -> nil (already in the stack)
|
|
(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 "SPECDB::FIFO" do
|
|
it "basics, 3 values" do
|
|
car0 = Car.new "Corvet-0", "red", [] of String
|
|
car1 = Car.new "Corvet-1", "red", [] of String
|
|
car2 = Car.new "Corvet-2", "red", [] of String
|
|
car3 = Car.new "Corvet-3", "red", [] of String
|
|
|
|
db = SPECDB::FIFO(Car).new "", 3
|
|
|
|
db.data.keys.sort.should eq([] of Int32)
|
|
|
|
db << car0
|
|
db.data.keys.sort.should eq([0] of Int32)
|
|
|
|
db << car1
|
|
db.data.keys.sort.should eq([0, 1] of Int32)
|
|
|
|
db << car2
|
|
db.data.keys.sort.should eq([0, 1, 2] of Int32)
|
|
db[0] # Let's use the first value, it shouldn't be the one to be dropped.
|
|
|
|
db << car3
|
|
db.data.keys.sort.should eq([0, 2, 3] of Int32)
|
|
|
|
db.delete 2
|
|
db.data.keys.sort.should eq([0, 3] of Int32)
|
|
db.stack.data.should eq([3, 0] of Int32)
|
|
end
|
|
end
|