18 lines
699 B
JavaScript
18 lines
699 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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t.equal(sampleSize(arr).length, 1, 'Returns a single element without n specified');
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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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t.equal(sampleSize(arr, 5).length, 4, 'Returns all elements in an array if n >= length');
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t.deepEqual(sampleSize([], 2), [], 'Returns an empty array if original array is empty');
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t.deepEqual(sampleSize(arr, 0), [], 'Returns an empty array if n = 0');
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