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local multiset = require "headers.multiset"
describe("Multisets can be created", function()
it("without errors", function()
assert.has_no.errors(function()
local _ = multiset.new()
end)
end)
end)
describe("Size of multiset", function()
local set
setup(function()
set = multiset.new()
end)
it("can be checked with method", function()
assert.is_not_nil(set:size())
end)
it("can be checked with operator", function()
assert.is_not_nil(#set)
end)
it("is zero after creation", function()
assert.are.equal(0, #set)
end)
end)
describe("Values", function()
randomize(false)
local set
setup(function()
set = multiset.new()
end)
it("are not present before insertion", function()
assert.is_false(set:has"will-be-removed")
assert.is_false(set:has"will-stay")
assert.is_false(set:has"never-inserted")
end)
it("were not tracked before insertion", function()
assert.is_false(set:had"will-be-removed")
assert.is_false(set:had"will-stay")
assert.is_false(set:had"never-inserted")
end)
it("can be inserted", function()
assert.has_no.errors(function()
set:add"will-be-removed"
set:add"will-stay"
end)
end)
it("are present after insertion", function()
assert.is_true(set:has"will-be-removed")
assert.is_true(set:has"will-stay")
assert.is_false(set:has"never-inserted")
end)
it("are tracked after insertion", function()
assert.is_true(set:had"will-be-removed")
assert.is_true(set:had"will-stay")
assert.is_false(set:had"never-inserted")
end)
it("are counted in size", function()
assert.are.equal(2, #set)
end)
it("can be removed", function()
assert.has_no.errors(function()
set:remove"will-be-removed"
end)
end)
it("are no longer present after removal", function()
assert.is_false(set:has"will-be-removed")
assert.is_true(set:has"will-stay")
assert.is_false(set:has"never-inserted")
end)
it("are still tracked after removal", function()
assert.is_true(set:had"will-be-removed")
assert.is_true(set:had"will-stay")
assert.is_false(set:had"never-inserted")
end)
it("are not counted after removal", function()
assert.are.equal(1, #set)
end)
it("are removed only once", function()
set:remove"will-be-removed"
assert.is_false(set:has"will-be-removed")
set:add"will-be-removed"
assert.is_true(set:has"will-be-removed")
end)
end)
describe("Iterator", function()
randomize(false)
local set
setup(function()
set = multiset.new()
set:add"a"
set:add"b"
set:add"c"
set:add"d"
end)
it("preserves order", function()
local items = {}
for value in set:all() do
table.insert(items, value)
end
assert.are.same({"a", "b", "c", "d"}, items)
end)
it("does not include past values", function()
set:remove"c"
set:add"e"
local items = {}
for value in set:all() do
table.insert(items, value)
end
assert.are.same({"a", "b", "d", "e"}, items)
end)
it("keeps the order of re-added values", function()
set:add"c"
local items = {}
for value in set:all() do
table.insert(items, value)
end
assert.are.same({"a", "b", "c", "d", "e"}, items)
end)
end)
describe("Clones", function()
randomize(false)
local a
local b
setup(function()
a = multiset.new()
a:add"set-in-a"
end)
it("can be created", function()
assert.has_no.errors(function()
b = a:clone()
end)
assert.is_not_nil(b)
end)
it("do not interfere with their original", function()
assert.is_true(a:has"set-in-a")
assert.is_true(b:has"set-in-a")
assert.is_false(a:has"set-in-b")
assert.is_false(b:has"set-in-b")
b:add"set-in-b"
assert.is_false(a:has"set-in-b")
assert.is_true(b:has"set-in-b")
end)
end)
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