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* Install test dependencies. * Add initial test files. These files were created using a simplistic AST manipulator using `recast` to preserve formatting. There's bound to be a huge chunk of errors, but this serves as a good start. QUnit was replaced with Mocha, with ES2015 imports running via `esm`. As far as possible, QUnit-specific syntax has been replaced with Mocha's `describe` and `it`, while the native Node.js `assert` module is used for assertions. Files in the `test` directory ending in `.test.js` will be treated as test files. * Add initial passing files to test run.
77 lines
2.4 KiB
JavaScript
77 lines
2.4 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { falsey, empties, stubArray } from './utils.js';
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import sampleSize from '../sampleSize.js';
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describe('sampleSize', function() {
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var array = [1, 2, 3];
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it('should return an array of random elements', function() {
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var actual = sampleSize(array, 2);
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assert.strictEqual(actual.length, 2);
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assert.deepStrictEqual(lodashStable.difference(actual, array), []);
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});
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it('should contain elements of the collection', function() {
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var actual = sampleSize(array, array.length).sort();
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assert.deepStrictEqual(actual, array);
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});
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it('should treat falsey `size` values, except `undefined`, as `0`', function() {
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var expected = lodashStable.map(falsey, function(value) {
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return value === undefined ? ['a'] : [];
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});
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var actual = lodashStable.map(falsey, function(size, index) {
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return index ? sampleSize(['a'], size) : sampleSize(['a']);
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should return an empty array when `n` < `1` or `NaN`', function() {
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lodashStable.each([0, -1, -Infinity], function(n) {
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assert.deepStrictEqual(sampleSize(array, n), []);
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});
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});
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it('should return all elements when `n` >= `length`', function() {
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lodashStable.each([3, 4, Math.pow(2, 32), Infinity], function(n) {
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var actual = sampleSize(array, n).sort();
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assert.deepStrictEqual(actual, array);
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});
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});
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it('should coerce `n` to an integer', function() {
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var actual = sampleSize(array, 1.6);
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assert.strictEqual(actual.length, 1);
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});
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it('should return an empty array for empty collections', function() {
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var expected = lodashStable.map(empties, stubArray);
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var actual = lodashStable.transform(empties, function(result, value) {
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try {
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result.push(sampleSize(value, 1));
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} catch (e) {}
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should sample an object', function() {
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var object = { 'a': 1, 'b': 2, 'c': 3 },
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actual = sampleSize(object, 2);
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assert.strictEqual(actual.length, 2);
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assert.deepStrictEqual(lodashStable.difference(actual, lodashStable.values(object)), []);
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});
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it('should work as an iteratee for methods like `_.map`', function() {
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var actual = lodashStable.map([['a']], sampleSize);
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assert.deepStrictEqual(actual, [['a']]);
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});
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});
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