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backend/node_modules/find-my-way/test/null-object.test.js

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