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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.
67 lines
2.2 KiB
JavaScript
67 lines
2.2 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { LARGE_ARRAY_SIZE } from './utils.js';
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import countBy from '../countBy.js';
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describe('countBy', function() {
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var array = [6.1, 4.2, 6.3];
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it('should transform keys by `iteratee`', function() {
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var actual = countBy(array, Math.floor);
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assert.deepStrictEqual(actual, { '4': 1, '6': 2 });
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});
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it('should use `_.identity` when `iteratee` is nullish', function() {
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var array = [4, 6, 6],
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values = [, null, undefined],
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expected = lodashStable.map(values, lodashStable.constant({ '4': 1, '6': 2 }));
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var actual = lodashStable.map(values, function(value, index) {
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return index ? countBy(array, value) : countBy(array);
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should work with `_.property` shorthands', function() {
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var actual = countBy(['one', 'two', 'three'], 'length');
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assert.deepStrictEqual(actual, { '3': 2, '5': 1 });
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});
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it('should only add values to own, not inherited, properties', function() {
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var actual = countBy(array, function(n) {
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return Math.floor(n) > 4 ? 'hasOwnProperty' : 'constructor';
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});
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assert.deepStrictEqual(actual.constructor, 1);
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assert.deepStrictEqual(actual.hasOwnProperty, 2);
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});
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it('should work with a number for `iteratee`', function() {
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var array = [
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[1, 'a'],
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[2, 'a'],
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[2, 'b']
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];
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assert.deepStrictEqual(countBy(array, 0), { '1': 1, '2': 2 });
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assert.deepStrictEqual(countBy(array, 1), { 'a': 2, 'b': 1 });
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});
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it('should work with an object for `collection`', function() {
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var actual = countBy({ 'a': 6.1, 'b': 4.2, 'c': 6.3 }, Math.floor);
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assert.deepStrictEqual(actual, { '4': 1, '6': 2 });
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});
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it('should work in a lazy sequence', function() {
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var array = lodashStable.range(LARGE_ARRAY_SIZE).concat(
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lodashStable.range(Math.floor(LARGE_ARRAY_SIZE / 2), LARGE_ARRAY_SIZE),
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lodashStable.range(Math.floor(LARGE_ARRAY_SIZE / 1.5), LARGE_ARRAY_SIZE)
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);
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var actual = _(array).countBy().map(square).filter(isEven).take().value();
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assert.deepEqual(actual, _.take(_.filter(_.map(countBy(array), square), isEven)));
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});
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});
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