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* test Served blackjack should be around 4% * test served blackjack across multiple decks * stats for Dealer bust after deal and player stand Following the information here http://www.blackjackage.com/bust-out-rate.php * add stats references to README and some info about pseudo-random * add expect(numberOfPlayerWinningGames).toBeLessThan(numberOfDealerWinningGames) closes #55 Signed-off-by: Marco Casula <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| import crypto from 'crypto' | ||
| import { calculate, isBlackjack, getHigherValidValue } from '../src/engine' | ||
| const deck = require('52-deck') | ||
| deck.getRandom = (min, max) => { | ||
| let number | ||
| const range = max - min + 1 | ||
| do | ||
| { | ||
| const buffer = crypto.randomBytes(4) | ||
| number = buffer.readUInt8(0) | ||
| } | ||
| while (number >= Number.MAX_VALUE - (Number.MAX_VALUE % range)) | ||
| number %= range | ||
| return number + min | ||
| } | ||
|
|
||
| describe('Probabilities', () => { | ||
| describe('Served blackjack', () => { | ||
| [1,2,4,6,8].forEach(numberOfDecks => { | ||
| it(`should be around 4% with ${numberOfDecks} deck/s`, () => { | ||
| const MAX = 10000 | ||
| let p = 0 | ||
| let d = 0 | ||
| for(let i = 0; i < MAX; i ++) { | ||
| const cards = deck.shuffle(deck.newDecks(numberOfDecks)) | ||
| const playerCards = cards.splice(cards.length - 2, 2) | ||
| const dealerFirstCards = cards.splice(cards.length - 1, 1) | ||
| const dealerHoleCard = cards.splice(cards.length - 1, 1)[ 0 ] | ||
| const dealerCards = dealerFirstCards.concat([dealerHoleCard]) | ||
| const playerHasBlackjack = isBlackjack(playerCards) | ||
| const dealerHasBlackjack = isBlackjack(dealerCards) | ||
| p = playerHasBlackjack ? p + 1 : p | ||
| d = dealerHasBlackjack ? d + 1 : d | ||
| } | ||
| p = (p / MAX) * 100 | ||
| d = (d / MAX) * 100 | ||
| expect(p).toBeGreaterThanOrEqual(4) | ||
| expect(p).toBeLessThanOrEqual(6) | ||
|
|
||
| expect(d).toBeGreaterThanOrEqual(4) | ||
| expect(d).toBeLessThanOrEqual(6) | ||
| }) | ||
| }) | ||
| }) | ||
| describe('Dealer bust after deal and player stand', () => { | ||
| [1,2,4,6,8].forEach(numberOfDecks => { | ||
| it(`should be between 22 and 32% with ${numberOfDecks} deck/s`, () => { | ||
| const MAX = 1000 | ||
| let numberOfBustedGames = 0 | ||
| let numberOfDealerWinningGames = 0 | ||
| let numberOfPlayerWinningGames = 0 | ||
| let numberOfPushGames = 0 | ||
| for (let i = 0; i < MAX; i++) { | ||
| const cards = deck.shuffle(deck.newDecks(numberOfDecks)) | ||
| const playerCards = cards.splice(cards.length - 2, 2) | ||
| const dealerFirstCards = cards.splice(cards.length - 1, 1) | ||
| const dealerHoleCard = cards.splice(cards.length - 1, 1)[0] | ||
| let dealerCards = dealerFirstCards.concat([dealerHoleCard]) | ||
| const pV = getHigherValidValue(calculate(playerCards)) | ||
| let dV = getHigherValidValue(calculate(dealerCards)) | ||
| while (dV < 17){ | ||
| const nextCard = cards.splice(cards.length - 1, 1)[0] | ||
| dealerCards = dealerCards.concat([nextCard]) | ||
| dV = getHigherValidValue(calculate(dealerCards)) | ||
| } | ||
| let dealerHasBusted = dV > 21 | ||
|
|
||
| if (dealerHasBusted) { | ||
| numberOfBustedGames++ | ||
| } | ||
| if (!dealerHasBusted && dV > pV) { | ||
| numberOfDealerWinningGames++ | ||
| } | ||
| if (pV > dV || dealerHasBusted) { | ||
| numberOfPlayerWinningGames++ | ||
| } | ||
| if (!dealerHasBusted && dV === pV) { | ||
| numberOfPushGames++ | ||
| } | ||
| } | ||
| numberOfBustedGames = (numberOfBustedGames / MAX) * 100 | ||
| expect(numberOfBustedGames).toBeGreaterThanOrEqual(22) | ||
| expect(numberOfBustedGames).toBeLessThanOrEqual(32) | ||
| expect(numberOfPlayerWinningGames).toBeLessThan(numberOfDealerWinningGames) | ||
| }) | ||
| }) | ||
| }) | ||
| }) |
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