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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.
63 lines
1.9 KiB
JavaScript
63 lines
1.9 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { arrayProto, LARGE_ARRAY_SIZE } from './utils.js';
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import head from '../head.js';
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import first from '../first.js';
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describe('head', function() {
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var array = [1, 2, 3, 4];
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it('should return the first element', function() {
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assert.strictEqual(head(array), 1);
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});
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it('should return `undefined` when querying empty arrays', function() {
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arrayProto[0] = 1;
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assert.strictEqual(head([]), undefined);
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arrayProto.length = 0;
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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, head);
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assert.deepStrictEqual(actual, [1, 4, 7]);
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});
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it('should be aliased', function() {
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assert.strictEqual(first, head);
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});
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it('should return an unwrapped value when implicitly chaining', function() {
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var wrapped = _(array);
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assert.strictEqual(wrapped.head(), 1);
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assert.strictEqual(wrapped.first(), 1);
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});
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it('should return a wrapped value when explicitly chaining', function() {
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var wrapped = _(array).chain();
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assert.ok(wrapped.head() instanceof _);
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assert.ok(wrapped.first() instanceof _);
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});
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it('should not execute immediately when explicitly chaining', function() {
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var wrapped = _(array).chain();
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assert.strictEqual(wrapped.head().__wrapped__, array);
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assert.strictEqual(wrapped.first().__wrapped__, array);
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});
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it('should work in a lazy sequence', function() {
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var largeArray = lodashStable.range(LARGE_ARRAY_SIZE),
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smallArray = array;
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lodashStable.each(['head', 'first'], function(methodName) {
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lodashStable.times(2, function(index) {
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var array = index ? largeArray : smallArray,
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actual = _(array).filter(isEven)[methodName]();
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assert.strictEqual(actual, _[methodName](_.filter(array, isEven)));
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});
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});
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});
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});
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