23 lines
773 B
JavaScript
23 lines
773 B
JavaScript
const expect = require('expect');
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const sampleSize = require('./sampleSize.js');
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test('sampleSize is a Function', () => {
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expect(sampleSize).toBeInstanceOf(Function);
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});
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const arr = [3, 7, 9, 11];
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test('Returns a single element without n specified', () => {
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expect(sampleSize(arr).length).toBe(1);
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});
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test('Returns a random sample of specified size from an array', () => {
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expect(sampleSize(arr, 2).every(x => arr.includes(x))).toBeTruthy();
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});
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test('Returns all elements in an array if n >= length', () => {
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expect(sampleSize(arr, 5).length).toBe(4);
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});
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test('Returns an empty array if original array is empty', () => {
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expect(sampleSize([], 2)).toEqual([]);
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});
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test('Returns an empty array if n = 0', () => {
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expect(sampleSize(arr, 0)).toEqual([]);
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});
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