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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.
66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { falsey, LARGE_ARRAY_SIZE, isEven } from './utils.js';
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import take from '../take.js';
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describe('take', function() {
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var array = [1, 2, 3];
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it('should take the first two elements', function() {
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assert.deepStrictEqual(take(array, 2), [1, 2]);
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});
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it('should treat falsey `n` values, except `undefined`, as `0`', function() {
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var expected = lodashStable.map(falsey, function(value) {
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return value === undefined ? [1] : [];
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});
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var actual = lodashStable.map(falsey, function(n) {
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return take(array, n);
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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`', function() {
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lodashStable.each([0, -1, -Infinity], function(n) {
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assert.deepStrictEqual(take(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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assert.deepStrictEqual(take(array, n), array);
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});
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});
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it('should work as an iteratee for methods like `_.map`', function() {
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var array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
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actual = lodashStable.map(array, take);
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assert.deepStrictEqual(actual, [[1], [4], [7]]);
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});
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it('should work in a lazy sequence', function() {
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var array = lodashStable.range(1, LARGE_ARRAY_SIZE + 1),
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predicate = function(value) { values.push(value); return isEven(value); },
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values = [],
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actual = _(array).take(2).take().value();
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assert.deepEqual(actual, take(take(array, 2)));
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actual = _(array).filter(predicate).take(2).take().value();
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assert.deepEqual(values, [1, 2]);
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assert.deepEqual(actual, take(take(_.filter(array, predicate), 2)));
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actual = _(array).take(6).takeRight(4).take(2).takeRight().value();
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assert.deepEqual(actual, _.takeRight(take(_.takeRight(take(array, 6), 4), 2)));
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values = [];
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actual = _(array).take(array.length - 1).filter(predicate).take(6).takeRight(4).take(2).takeRight().value();
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assert.deepEqual(values, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]);
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assert.deepEqual(actual, _.takeRight(take(_.takeRight(take(_.filter(take(array, array.length - 1), predicate), 6), 4), 2)));
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});
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});
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