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random.test.js
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random.test.js
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/*
* Copyright 2017 The boardgame.io Authors
*
* Use of this source code is governed by a MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
*/
import { Random } from './random';
import { makeMove } from './action-creators';
import { CreateGameReducer } from './reducer';
import { InitializeGame } from './initialize';
function Init(seed) {
const ctx = { _random: { seed } };
return new Random(ctx);
}
test('constructor', () => {
const r = new Random({});
expect(r.state).toEqual({ seed: '0' });
});
test('attach / detach / update', () => {
const r = new Random({});
const ctx = r.attach({});
expect(ctx._random).not.toBeDefined();
expect(ctx.random).toBeDefined();
{
const t = Random.detach(ctx);
expect(t._random).not.toBeDefined();
expect(t.random).not.toBeDefined();
}
{
const t = r.update({ ctx }).ctx;
expect(t._random).toBeDefined();
expect(t.random).toBeDefined();
}
});
test('random', () => {
const r = Init('hi there');
// make sure that subsequent calls are different.
expect(r._random()).toBe(0.573445922927931);
expect(r._random()).toBe(0.4695413049776107);
expect(r._random()).toBe(0.5943194630090147);
});
test('predefined dice values', () => {
const r = Init(0);
const rfns = [4, 6, 8, 10, 12, 20].map(v => {
return { fn: r._api()[`D${v}`], highest: v };
});
rfns.forEach(pair => {
const result = pair.fn();
expect(result).toBeDefined();
expect(result).toBeGreaterThanOrEqual(1);
expect(result).toBeLessThanOrEqual(pair.highest);
expect(r.state.prngstate).toBeDefined();
const multiple = pair.fn(5);
expect(multiple).toBeDefined();
expect(multiple).toHaveLength(5);
multiple.forEach(m => {
expect(m).toBeGreaterThanOrEqual(1);
expect(m).toBeLessThanOrEqual(pair.highest);
});
});
});
test('Random.Die', () => {
const r = Init(0);
const _api = r._api();
{
const result = _api.Die(123);
expect(result).toBeDefined();
expect(result).toBe(74);
expect(r.state.prngstate).toBeDefined();
}
{
const result = _api.Die();
expect(result).toBeDefined();
expect(result).toBeLessThanOrEqual(6);
expect(r.state.prngstate).toBeDefined();
}
{
const multiple = _api.Die(6, 3);
expect(multiple).toBeDefined();
expect(multiple).toHaveLength(3);
multiple.forEach(m => {
expect(m).toBeGreaterThanOrEqual(1);
expect(m).toBeLessThanOrEqual(6);
});
expect(r.state.prngstate).toBeDefined();
}
});
test('Random.Number', () => {
const r = Init(0);
const result = r._api().Number();
expect(result).toBeDefined();
expect(result).toBeGreaterThanOrEqual(0);
expect(result).toBeLessThanOrEqual(1);
expect(r.state.prngstate).toBeDefined();
});
test('Random.Shuffle', () => {
const r = Init(0);
const initialTiles = ['A', 'B', 'C', 'D', 'E'];
const tiles = [...initialTiles];
const result = r._api().Shuffle(tiles);
expect(result).toHaveLength(initialTiles.length);
expect(result).toEqual(expect.arrayContaining(initialTiles));
expect(result.sort()).toEqual(initialTiles);
expect(r.state.prngstate).toBeDefined();
});
test('Random API is not executed optimisitically', () => {
const game = {
seed: 0,
moves: {
rollDie: (G, ctx) => ({ ...G, die: ctx.random.D6() }),
},
};
{
const reducer = CreateGameReducer({ game });
let state = InitializeGame({ game });
expect(state.G.die).not.toBeDefined();
state = reducer(state, makeMove('rollDie'));
expect(state.G).toMatchObject({ die: 4 });
}
{
const reducer = CreateGameReducer({ game, multiplayer: () => {} });
let state = InitializeGame({ game });
expect(state.G.die).not.toBeDefined();
state = reducer(state, makeMove('rollDie'));
expect(state.G.die).not.toBeDefined();
}
});
test('turn.onBegin has ctx APIs at the beginning of the game', () => {
let random = null;
let events = null;
const game = {
turn: {
onBegin: (G, ctx) => {
random = ctx.random;
events = ctx.events;
},
},
};
InitializeGame({ game });
expect(random).not.toBe(null);
expect(events).not.toBe(null);
});