37 lines
947 B
JavaScript
37 lines
947 B
JavaScript
'use strict'
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const { test } = require('node:test')
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const { NullObject } = require('../lib/null-object')
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test('NullObject', t => {
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t.plan(2)
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const nullObject = new NullObject()
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t.assert.ok(nullObject instanceof NullObject)
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t.assert.ok(typeof nullObject === 'object')
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})
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test('has no methods from generic Object class', t => {
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function getAllPropertyNames (obj) {
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const props = []
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do {
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Object.getOwnPropertyNames(obj).forEach(function (prop) {
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if (props.indexOf(prop) === -1) {
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props.push(prop)
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}
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})
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} while (obj = Object.getPrototypeOf(obj)) // eslint-disable-line
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return props
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}
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const propertyNames = getAllPropertyNames({})
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t.plan(propertyNames.length + 1)
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const nullObject = new NullObject()
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for (const propertyName of propertyNames) {
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t.assert.ok(!(propertyName in nullObject), propertyName)
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}
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t.assert.equal(getAllPropertyNames(nullObject).length, 0)
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})
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