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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.
69 lines
2.3 KiB
JavaScript
69 lines
2.3 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { _, empties, noop, add } from './utils.js';
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describe('reduce methods', function() {
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lodashStable.each(['reduce', 'reduceRight'], function(methodName) {
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var func = _[methodName],
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array = [1, 2, 3],
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isReduce = methodName == 'reduce';
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it('`_.' + methodName + '` should reduce a collection to a single value', function() {
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var actual = func(['a', 'b', 'c'], function(accumulator, value) {
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return accumulator + value;
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}, '');
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assert.strictEqual(actual, isReduce ? 'abc' : 'cba');
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});
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it('`_.' + methodName + '` should support empty collections without an initial `accumulator` value', function() {
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var actual = [],
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expected = lodashStable.map(empties, noop);
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lodashStable.each(empties, function(value) {
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try {
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actual.push(func(value, noop));
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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('`_.' + methodName + '` should support empty collections with an initial `accumulator` value', function() {
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var expected = lodashStable.map(empties, lodashStable.constant('x'));
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var actual = lodashStable.map(empties, function(value) {
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try {
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return func(value, noop, 'x');
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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('`_.' + methodName + '` should handle an initial `accumulator` value of `undefined`', function() {
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var actual = func([], noop, undefined);
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assert.strictEqual(actual, undefined);
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});
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it('`_.' + methodName + '` should return `undefined` for empty collections when no `accumulator` is given (test in IE > 9 and modern browsers)', function() {
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var array = [],
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object = { '0': 1, 'length': 0 };
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if ('__proto__' in array) {
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array.__proto__ = object;
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assert.strictEqual(func(array, noop), undefined);
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}
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assert.strictEqual(func(object, noop), undefined);
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});
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it('`_.' + methodName + '` should return an unwrapped value when implicitly chaining', function() {
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assert.strictEqual(_(array)[methodName](add), 6);
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});
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it('`_.' + methodName + '` should return a wrapped value when explicitly chaining', function() {
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assert.ok(_(array).chain()[methodName](add) instanceof _);
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});
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});
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});
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