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local queue = require "util.queue";
describe("util.queue", function()
describe("#new()", function()
it("should work", function()
do
local q = queue.new(10);
assert.are.equal(q.size, 10);
assert.are.equal(q:count(), 0);
assert.is_true(q:push("one"));
assert.is_true(q:push("two"));
assert.is_true(q:push("three"));
for i = 4, 10 do
assert.is_true(q:push("hello"));
assert.are.equal(q:count(), i, "count is not "..i.."("..q:count()..")");
end
assert.are.equal(q:push("hello"), nil, "queue overfull!");
assert.are.equal(q:push("hello"), nil, "queue overfull!");
assert.are.equal(q:pop(), "one", "queue item incorrect");
assert.are.equal(q:pop(), "two", "queue item incorrect");
assert.is_true(q:push("hello"));
assert.is_true(q:push("hello"));
assert.are.equal(q:pop(), "three", "queue item incorrect");
assert.is_true(q:push("hello"));
assert.are.equal(q:push("hello"), nil, "queue overfull!");
assert.are.equal(q:push("hello"), nil, "queue overfull!");
assert.are.equal(q:count(), 10, "queue count incorrect");
for _ = 1, 10 do
assert.are.equal(q:pop(), "hello", "queue item incorrect");
end
assert.are.equal(q:count(), 0, "queue count incorrect");
assert.are.equal(q:pop(), nil, "empty queue pops non-nil result");
assert.are.equal(q:count(), 0, "popping empty queue affects count");
assert.are.equal(q:peek(), nil, "empty queue peeks non-nil result");
assert.are.equal(q:count(), 0, "peeking empty queue affects count");
assert.is_true(q:push(1));
for i = 1, 1001 do
assert.are.equal(q:pop(), i);
assert.are.equal(q:count(), 0);
assert.is_true(q:push(i+1));
assert.are.equal(q:count(), 1);
end
assert.are.equal(q:pop(), 1002);
assert.is_true(q:push(1));
for i = 1, 1000 do
assert.are.equal(q:pop(), i);
assert.is_true(q:push(i+1));
end
assert.are.equal(q:pop(), 1001);
assert.are.equal(q:count(), 0);
end
do
-- Test queues that purge old items when pushing to a full queue
local q = queue.new(10, true);
for i = 1, 10 do
q:push(i);
end
assert.are.equal(q:count(), 10);
assert.is_true(q:push(11));
assert.are.equal(q:count(), 10);
assert.are.equal(q:pop(), 2); -- First item should have been purged
assert.are.equal(q:peek(), 3);
for i = 12, 32 do
assert.is_true(q:push(i));
end
assert.are.equal(q:count(), 10);
assert.are.equal(q:pop(), 23);
end
do
-- Test iterator
local q = queue.new(10, true);
for i = 1, 10 do
q:push(i);
end
local i = 0;
for item in q:items() do
i = i + 1;
assert.are.equal(item, i, "unexpected item returned by iterator")
end
end
end);
end);
describe("consume()", function ()
it("should work", function ()
local q = queue.new(10);
for i = 1, 5 do
q:push(i);
end
local c = 0;
for i in q:consume() do
assert(i == c + 1);
assert(q:count() == (5-i));
c = i;
end
end);
it("should work even if items are pushed in the loop", function ()
local q = queue.new(10);
for i = 1, 5 do
q:push(i);
end
local c = 0;
for i in q:consume() do
assert(i == c + 1);
if c < 3 then
assert(q:count() == (5-i));
else
assert(q:count() == (6-i));
end
c = i;
if c == 3 then
q:push(6);
end
end
assert.equal(c, 6);
end);
end);
describe("replace()", function ()
it("should work", function ()
local q = queue.new(10);
for i = 1, 5 do
q:push(i);
end
q:replace(6);
local c = 0;
for i in q:consume() do
c = c + 1;
if c > 1 then
assert.is_equal(c, i);
elseif c == 1 then
assert.is_equal(6, i);
end
end
assert.is_equal(5, c);
end);
end);
end);
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