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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.
92 lines
2.6 KiB
JavaScript
92 lines
2.6 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { slice, _ } from './utils.js';
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import ary from '../ary.js';
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import curry from '../curry.js';
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import rearg from '../rearg.js';
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describe('ary', function() {
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function fn(a, b, c) {
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return slice.call(arguments);
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}
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it('should cap the number of arguments provided to `func`', function() {
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var actual = lodashStable.map(['6', '8', '10'], ary(parseInt, 1));
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assert.deepStrictEqual(actual, [6, 8, 10]);
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var capped = ary(fn, 2);
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assert.deepStrictEqual(capped('a', 'b', 'c', 'd'), ['a', 'b']);
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});
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it('should use `func.length` if `n` is not given', function() {
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var capped = ary(fn);
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assert.deepStrictEqual(capped('a', 'b', 'c', 'd'), ['a', 'b', 'c']);
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});
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it('should treat a negative `n` as `0`', function() {
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var capped = ary(fn, -1);
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try {
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var actual = capped('a');
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} catch (e) {}
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assert.deepStrictEqual(actual, []);
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});
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it('should coerce `n` to an integer', function() {
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var values = ['1', 1.6, 'xyz'],
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expected = [['a'], ['a'], []];
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var actual = lodashStable.map(values, function(n) {
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var capped = ary(fn, n);
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return capped('a', 'b');
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should not force a minimum argument count', function() {
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var args = ['a', 'b', 'c'],
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capped = ary(fn, 3);
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var expected = lodashStable.map(args, function(arg, index) {
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return args.slice(0, index);
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});
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var actual = lodashStable.map(expected, function(array) {
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return capped.apply(undefined, array);
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should use `this` binding of function', function() {
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var capped = ary(function(a, b) { return this; }, 1),
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object = { 'capped': capped };
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assert.strictEqual(object.capped(), object);
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});
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it('should use the existing `ary` if smaller', function() {
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var capped = ary(ary(fn, 1), 2);
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assert.deepStrictEqual(capped('a', 'b', 'c'), ['a']);
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});
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it('should work as an iteratee for methods like `_.map`', function() {
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var funcs = lodashStable.map([fn], ary),
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actual = funcs[0]('a', 'b', 'c');
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assert.deepStrictEqual(actual, ['a', 'b', 'c']);
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});
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it('should work when combined with other methods that use metadata', function() {
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var array = ['a', 'b', 'c'],
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includes = curry(rearg(ary(_.includes, 2), 1, 0), 2);
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assert.strictEqual(includes('b')(array, 2), true);
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includes = _(_.includes).ary(2).rearg(1, 0).curry(2).value();
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assert.strictEqual(includes('b')(array, 2), true);
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});
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});
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