217 lines
7.2 KiB
Lua
217 lines
7.2 KiB
Lua
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require 'busted.runner'()
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describe("gear", function()
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setup(function()
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gear = require 'init'
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algo = gear.algo
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rect = gear.rect
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math = require 'math'
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end)
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describe("insertion sort #sort", function()
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local insertionsort = algo.insertionsort
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it("sorts arrays", function()
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local elems = {}
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local expect = {}
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for n = 2,512 do
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for i = 1,n do
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elems[i] = math.random(-32768, 32767)
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expect[i] = elems[i]
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end
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table.sort(expect)
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insertionsort(elems)
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assert.are.same(expect, elems)
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end
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end)
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it("has no effect on single element array", function()
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for i = 1,10 do
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local val = (math.random() - 0.5) * 1024
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local expect = { val }
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local elems = { val }
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insertionsort(elems)
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assert.are.same(expect, elems)
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end
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end)
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it("does nothing on empty array", function()
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local expect = {}
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local elems = {}
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insertionsort(elems)
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assert.are.same(expect, elems)
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end)
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end)
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describe("binary search #bsearch", function()
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local bsearchl = algo.bsearchl
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local bsearchr = algo.bsearchr
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it("behaves properly on empty arrays", function()
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local empty = {}
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local idx = bsearchr(empty, 1)
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assert.is_true(empty[idx] == nil)
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idx = bsearchl(empty, 1)
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assert.is_true(empty[idx] == nil)
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end)
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it("finds elements within sorted arrays", function()
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local dims = { 1, 2, 64, 512, 1024 }
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for _,n in ipairs(dims) do
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local elems = {}
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for i = 1,n do
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elems[#elems+1] = ((math.random() - 0.5) * 4096)
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end
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local mustfind = {}
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for i = 1,10 do
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mustfind[#mustfind+1] = elems[math.random(1,#elems)]
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end
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local mustnotfind = {
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4097,
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-4097,
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-math.huge,
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math.huge,
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16386,
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-16386
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}
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table.sort(elems)
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for _,v in ipairs(mustfind) do
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local idx = bsearchl(elems, v)
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assert.equal(v, elems[idx])
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assert.is_false(elems[idx+1] ~= nil and elems[idx+1] <= v)
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idx = bsearchr(elems, v)
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assert.equal(v, elems[idx])
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assert.is_false(elems[idx+1] ~= nil and elems[idx+1] <= v)
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end
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for _,v in ipairs(mustnotfind) do
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local idx = bsearchl(elems, v)
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assert.not_equal(v, elems[idx])
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if v < elems[1] then
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assert.is_true(elems[idx] == nil)
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else
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assert.is_true(elems[idx] <= v)
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end
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idx = bsearchr(elems, v)
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assert.not_equal(v, elems[idx])
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if v > elems[#elems] then
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assert.is_true(elems[idx] == nil)
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else
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assert.is_true(elems[idx] >= v)
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end
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end
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end
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end)
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end)
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describe("rect #bounds", function()
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local bigreal = 9999999.0
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local min,max = math.min, math.max
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local pointinrect = rect.pointinside
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local rectempty = rect.isempty
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local recteq = rect.eq
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local rectexpand = rect.expand
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local rectinside = rect.rectinside
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local rectintersection = rect.intersection
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local rectunion = rect.union
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it("is empty if its dimensions are negative", function()
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assert.is_true(rectempty(0,0,-1,-1))
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assert.is_true(rectempty(bigreal,bigreal,-bigreal,-bigreal))
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assert.is_true(rectempty(-bigreal,-bigreal,-bigreal,-bigreal))
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assert.is_true(rectempty(0,0,bigreal,-1))
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assert.is_true(rectempty(0,0,0,-1))
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assert.is_true(rectempty(0,0,-1,bigreal))
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assert.is_true(rectempty(0,0,-1,0))
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assert.is_false(rectempty(0,0,0,0))
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assert.is_false(rectempty(0,0,-0,0))
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assert.is_false(rectempty(bigreal,bigreal,bigreal,bigreal))
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end)
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it("doesn't contain anything if empty", function()
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local x,y,w,h = 0,0,-1,-1
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assert.is_false(rectinside(0,0,0,0, x,y,w,h))
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assert.is_false(rectinside(x,y,w,h, x,y,w,h))
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assert.is_false(rectinside(0,0,bigreal,bigreal, x,y,w,h))
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assert.is_false(rectinside(0,0,-bigreal,-bigreal, x,y,w,h))
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end)
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it("always contains empty rect if non-empty", function()
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assert.is_true(rectinside(0,0,-1,-1, 0,0,0,0))
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assert.is_true(rectinside(bigreal,bigreal,-bigreal,-bigreal, 0,0,0,0))
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assert.is_true(rectinside(bigreal,bigreal,bigreal,-bigreal, 0,0,0,0))
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assert.is_true(rectinside(bigreal,bigreal,-bigreal,bigreal, 0,0,0,0))
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assert.is_true(rectinside(bigreal,bigreal,-1.0e-5,bigreal, 0,0,0,0))
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end)
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it("may contain a single point", function()
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for i,pt in ipairs({{0,0}, {bigreal,bigreal}, {-bigreal,-bigreal}}) do
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local px,py = pt[1], pt[2]
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local x,y,w,h = 0,0,-1,-1
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x,y,w,h = rectexpand(x,y,w,h, px,py)
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assert.is_false(rectempty(x,y,w,h))
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assert.is_true(pointinrect(px,py, x,y,w,h))
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assert.is_true(recteq(x,y,w,h, px,py,0,0))
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end
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end)
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it("may expand arbitrarily to contain more points", function()
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local points = {}
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local xmin,ymin = math.huge, math.huge
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local xmax,ymax = -math.huge,-math.huge
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for i = 1,16535 do
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local x = (math.random() - 0.5) * 50
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local y = (math.random() - 0.5) * 50
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points[#points+1] = { x, y }
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xmin = min(xmin, x)
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ymin = min(ymin, y)
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xmax = max(xmax, x)
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ymax = max(ymax, y)
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end
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local x,y,w,h = 0,0,-1,-1
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for i,pt in ipairs(points) do
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local px,py = pt[1], pt[2]
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x,y,w,h = rectexpand(x,y,w,h, px,py)
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assert.is_true(pointinrect(px,py, x,y,w,h))
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end
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local ex,ey,ew,eh = xmin,ymin, xmax-xmin,ymax-ymin
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assert.is_false(rectempty(x,y,w,h))
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assert.is_true(recteq(x,y,w,h, ex,ey,ew,eh, 0.1))
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end)
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it("may expand arbitrarily to contain more rects", function()
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pending("to be tested...")
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end)
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it("may be used to enclose arbitrary geometry", function()
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pending("to be tested...")
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end)
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it("may be tested against other rects", function()
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pending("to be tested...")
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end)
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it("may be intersected with other rects", function()
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pending("to be tested...")
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end)
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end)
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end)
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