48 lines
2.1 KiB
JavaScript
48 lines
2.1 KiB
JavaScript
const assert = require('assert');
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const should = require('should');
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const randomDecision = require('../random-decision');
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describe('randomDecision', function () {
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describe('#getRandomChoice()', function () {
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it(`should return one of available choices`, function () {
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randomDecision.getRandomChoice().should.equalOneOf(randomDecision.choices);
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});
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it('should return the first choice sometimes', function () {
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const expectedChoice = randomDecision.choices[0];
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const selectedChoices = new Set();
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for (let i = 0; i <= 1000; i++) {
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const decision = randomDecision.getRandomChoice();
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selectedChoices.add(decision);
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if (decision === expectedChoice) {
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should.ok(decision, 'First choice was found once');
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return;
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}
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}
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should.fail(selectedChoices, expectedChoice, 'First choice was never selected');
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})
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it('should return the last choice sometimes', function () {
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const expectedChoice = randomDecision.choices[randomDecision.choices.length - 1];
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const selectedChoices = new Set();
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for (let i = 0; i <= 1000; i++) {
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const decision = randomDecision.getRandomChoice();
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selectedChoices.add(decision);
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if (decision === expectedChoice) {
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should.ok(decision, 'Last choice was found once');
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return;
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}
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}
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should.fail(selectedChoices, expectedChoice, 'Last choice was never selected');
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})
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})
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describe('#getRandomChoice(seed)', function () {
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it('should always select the same value when the seed is the same', function () {
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const seed = new Date();
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const initialDecision = randomDecision.getRandomChoice(seed);
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for (let i = 0; i <= 1000; i++) {
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let randomChoice = randomDecision.getRandomChoice(seed);
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assert.strictEqual(randomChoice, initialDecision);
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}
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})
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})
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}) |