39 lines
1.5 KiB
JavaScript
39 lines
1.5 KiB
JavaScript
import test from 'node:test'
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import assert from 'node:assert/strict'
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import { freeCells, spawnApple, tick, newGame } from '../src/spawn.js'
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import { advance } from '../src/rules.js'
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import { loadFixture, freeze } from './helpers.js'
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const fixtureTests = (name, f) => {
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const fx = loadFixture(name)
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fx.cases.forEach((c) =>
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test(`m04 ${fx.function}: ${c.name}`, () => assert.deepStrictEqual(f(...freeze(c.args)), c.expected)))
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}
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fixtureTests('m04-free-cells', freeCells)
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fixtureTests('m04-spawn', spawnApple)
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fixtureTests('m04-new-game', newGame)
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fixtureTests('m04-tick', tick)
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// 3x2 board, one-cell snake, about to eat the apple at (1,0)
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const eating = freeze({
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width: 3, height: 2, snake: [{ x: 0, y: 0 }], dir: 'Right', nextDir: 'Right',
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apple: { x: 1, y: 0 }, seed: 0, score: 0, status: 'Playing', frame: 0,
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})
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test('m04 tick: eating the apple spawns a new one in the same step', () => {
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// snake becomes [(1,0),(0,0)]; free cells are (2,0),(0,1),(1,1),(2,1); seed 0 draws 1144304738 % 4 = 2 -> (1,1)
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assert.deepStrictEqual(tick(eating), {
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...eating, snake: [{ x: 1, y: 0 }, { x: 0, y: 0 }], apple: { x: 1, y: 1 }, score: 1, seed: 1831565813,
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})
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})
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test('m04 tick is spawnApple after advance', () => assert.deepStrictEqual(tick(eating), spawnApple(advance(eating))))
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test('m04 tick leaves the seed alone when no apple needs spawning', () => {
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const s = freeze({ ...eating, apple: { x: 2, y: 1 } })
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assert.equal(tick(s).seed, 0)
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})
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test('m04 newGame is reproducible: same seed, same game', () => assert.deepStrictEqual(newGame(42), newGame(42)))
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