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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.
107 lines
3.3 KiB
JavaScript
107 lines
3.3 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { args, _ } from './utils.js';
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import flatten from '../flatten.js';
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import flattenDeep from '../flattenDeep.js';
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import flattenDepth from '../flattenDepth.js';
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describe('flatten methods', function() {
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var array = [1, [2, [3, [4]], 5]],
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methodNames = ['flatten', 'flattenDeep', 'flattenDepth'];
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it('should flatten `arguments` objects', function() {
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var array = [args, [args]];
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assert.deepStrictEqual(flatten(array), [1, 2, 3, args]);
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assert.deepStrictEqual(flattenDeep(array), [1, 2, 3, 1, 2, 3]);
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assert.deepStrictEqual(flattenDepth(array, 2), [1, 2, 3, 1, 2, 3]);
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});
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it('should treat sparse arrays as dense', function() {
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var array = [[1, 2, 3], Array(3)],
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expected = [1, 2, 3];
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expected.push(undefined, undefined, undefined);
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lodashStable.each(methodNames, function(methodName) {
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var actual = _[methodName](array);
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assert.deepStrictEqual(actual, expected);
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assert.ok('4' in actual);
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});
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});
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it('should flatten objects with a truthy `Symbol.isConcatSpreadable` value', function() {
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if (Symbol && Symbol.isConcatSpreadable) {
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var object = { '0': 'a', 'length': 1 },
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array = [object],
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expected = lodashStable.map(methodNames, lodashStable.constant(['a']));
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object[Symbol.isConcatSpreadable] = true;
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var actual = lodashStable.map(methodNames, function(methodName) {
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return _[methodName](array);
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});
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assert.deepStrictEqual(actual, expected);
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}
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});
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it('should work with extremely large arrays', function() {
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lodashStable.times(3, function(index) {
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var expected = Array(5e5);
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try {
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var func = flatten;
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if (index == 1) {
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func = flattenDeep;
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} else if (index == 2) {
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func = flattenDepth;
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}
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assert.deepStrictEqual(func([expected]), expected);
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} catch (e) {
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assert.ok(false, e.message);
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}
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});
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});
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it('should work with empty arrays', function() {
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var array = [[], [[]], [[], [[[]]]]];
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assert.deepStrictEqual(flatten(array), [[], [], [[[]]]]);
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assert.deepStrictEqual(flattenDeep(array), []);
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assert.deepStrictEqual(flattenDepth(array, 2), [[[]]]);
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});
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it('should support flattening of nested arrays', function() {
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assert.deepStrictEqual(flatten(array), [1, 2, [3, [4]], 5]);
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assert.deepStrictEqual(flattenDeep(array), [1, 2, 3, 4, 5]);
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assert.deepStrictEqual(flattenDepth(array, 2), [1, 2, 3, [4], 5]);
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});
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it('should return an empty array for non array-like objects', function() {
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var expected = [],
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nonArray = { '0': 'a' };
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assert.deepStrictEqual(flatten(nonArray), expected);
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assert.deepStrictEqual(flattenDeep(nonArray), expected);
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assert.deepStrictEqual(flattenDepth(nonArray, 2), expected);
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});
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it('should return a wrapped value when chaining', function() {
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var wrapped = _(array),
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actual = wrapped.flatten();
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assert.ok(actual instanceof _);
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assert.deepEqual(actual.value(), [1, 2, [3, [4]], 5]);
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actual = wrapped.flattenDeep();
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assert.ok(actual instanceof _);
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assert.deepEqual(actual.value(), [1, 2, 3, 4, 5]);
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actual = wrapped.flattenDepth(2);
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assert.ok(actual instanceof _);
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assert.deepEqual(actual.value(), [1, 2, 3, [4], 5]);
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});
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});
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