ZacharyZhang-NY
5605d785de
Fifteen shop components: PriceTag, Wallet, ShopItem, Cart, Receipt, Checkout, CurrencyConvert, SaleBadge, Quantity, PricingTiers, Coupon, DailyReward, BidTicker, TradeWindow and VendingMachine. Receipt prints dot by dot with feed holes and a torn edge; Coupon cuts real notches; SaleBadge is a sixteen-point starburst; VendingMachine sells A1 to D4 by code and drops the snack into its tray. Sums are checked against overflow, TradeWindow withdraws both confirms on any change to an offer, and a disabled Checkout veils its inert content. text.Odometer now counts digits as text, steps at 15 fps as S5 asks, draws exact digits at rest and lands rolls that floats would stall.
70 lines
2.0 KiB
Go
70 lines
2.0 KiB
Go
package text_test
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import (
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"bytes"
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"math"
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"testing"
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"time"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/text"
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)
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func TestOdometerHoldsMaxIntAndRollsWithinS5(t *testing.T) {
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clk := newClock()
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view(400, 100, clk, func(c *ui.Context) { text.Odometer(c, math.MaxInt, text.OdometerOptions{}) })
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value := 0
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tt := view(400, 100, clk, func(c *ui.Context) { text.Odometer(c, value, text.OdometerOptions{Digits: 3}) })
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value = 999
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tt.Frame()
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// S5: a second of rolling changes at most 15 times.
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changes, last := 0, append([]byte(nil), tt.Image().Pix...)
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for range 30 {
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clk.t = clk.t.Add(time.Second / 30)
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tt.Frame()
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if !bytes.Equal(last, tt.Image().Pix) {
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changes++
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last = append(last[:0], tt.Image().Pix...)
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}
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}
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if changes > 15 || changes == 0 {
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t.Fatalf("the odometer changed %d times in a second", changes)
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}
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}
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func TestOdometerShowsBigIntsExactly(t *testing.T) {
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clk := newClock()
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cell := func(v, digits int) []byte {
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tt := view(400, 100, clk, func(c *ui.Context) { text.Odometer(c, v, text.OdometerOptions{Digits: digits}) })
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img := tt.Image()
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// The last digit's 10-dot cell, at two pixels a dot.
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var out []byte
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for y := 0; y < 2*18; y++ {
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x0 := 2 * 10 * (digits - 1)
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out = append(out, img.Pix[y*img.Stride+4*x0:y*img.Stride+4*(x0+20)]...)
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}
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return out
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}
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// 2^53+1 ends in 3; a float rounds it away.
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if !bytes.Equal(cell(9007199254740993, 16), cell(3, 1)) {
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t.Fatal("9007199254740993 does not end in a drawn 3")
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}
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}
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func TestOdometerRollsHomeOnBigInts(t *testing.T) {
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clk := newClock()
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value := 0
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tt := view(400, 100, clk, func(c *ui.Context) { text.Odometer(c, value, text.OdometerOptions{Digits: 16}) })
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value = 9007199254740993
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for range 400 {
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clk.add(time.Second / 15)
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tt.Frame()
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}
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// Floats stall short of 2^53+1; the roll must still land.
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ref := view(400, 100, clk, func(c *ui.Context) { text.Odometer(c, 9007199254740993, text.OdometerOptions{Digits: 16}) })
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if !bytes.Equal(tt.Image().Pix, ref.Image().Pix) {
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t.Fatal("the roll never landed on 9007199254740993")
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}
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}
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