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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
1.8 KiB
JavaScript
66 lines
1.8 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { args, falsey, stubA, stubB, noop } from './utils.js';
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import nthArg from '../nthArg.js';
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describe('nthArg', function() {
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var args = ['a', 'b', 'c', 'd'];
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it('should create a function that returns its nth argument', function() {
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var actual = lodashStable.map(args, function(value, index) {
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var func = nthArg(index);
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return func.apply(undefined, args);
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});
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assert.deepStrictEqual(actual, args);
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});
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it('should work with a negative `n`', function() {
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var actual = lodashStable.map(lodashStable.range(1, args.length + 1), function(n) {
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var func = nthArg(-n);
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return func.apply(undefined, args);
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});
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assert.deepStrictEqual(actual, ['d', 'c', 'b', 'a']);
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});
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it('should coerce `n` to an integer', function() {
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var values = falsey,
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expected = lodashStable.map(values, stubA);
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var actual = lodashStable.map(values, function(n) {
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var func = n ? nthArg(n) : nthArg();
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return func.apply(undefined, args);
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});
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assert.deepStrictEqual(actual, expected);
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values = ['1', 1.6];
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expected = lodashStable.map(values, stubB);
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actual = lodashStable.map(values, function(n) {
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var func = nthArg(n);
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return func.apply(undefined, args);
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should return `undefined` for empty arrays', function() {
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var func = nthArg(1);
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assert.strictEqual(func(), undefined);
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});
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it('should return `undefined` for non-indexes', function() {
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var values = [Infinity, args.length],
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expected = lodashStable.map(values, noop);
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var actual = lodashStable.map(values, function(n) {
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var func = nthArg(n);
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return func.apply(undefined, args);
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});
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assert.deepStrictEqual(actual, expected);
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});
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});
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