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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.
46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { falsey, args, slice, symbol, realm } from './utils.js';
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import isUndefined from '../isUndefined.js';
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describe('isUndefined', function() {
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it('should return `true` for `undefined` values', function() {
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assert.strictEqual(isUndefined(), true);
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assert.strictEqual(isUndefined(undefined), true);
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});
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it('should return `false` for non `undefined` values', function() {
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var expected = lodashStable.map(falsey, function(value) {
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return value === undefined;
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});
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var actual = lodashStable.map(falsey, function(value, index) {
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return index ? isUndefined(value) : isUndefined();
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});
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assert.deepStrictEqual(actual, expected);
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assert.strictEqual(isUndefined(args), false);
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assert.strictEqual(isUndefined([1, 2, 3]), false);
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assert.strictEqual(isUndefined(true), false);
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assert.strictEqual(isUndefined(new Date), false);
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assert.strictEqual(isUndefined(new Error), false);
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assert.strictEqual(isUndefined(_), false);
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assert.strictEqual(isUndefined(slice), false);
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assert.strictEqual(isUndefined({ 'a': 1 }), false);
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assert.strictEqual(isUndefined(1), false);
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assert.strictEqual(isUndefined(/x/), false);
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assert.strictEqual(isUndefined('a'), false);
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if (Symbol) {
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assert.strictEqual(isUndefined(symbol), false);
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}
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});
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it('should work with `undefined` from another realm', function() {
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if (realm.object) {
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assert.strictEqual(isUndefined(realm.undefined), true);
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}
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});
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});
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