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'use strict'; require('../common'); const vm = require('vm'); const assert = require('assert'); let base = { propBase: 1 }; let sandbox = Object.create(base, { propSandbox: { value: 3 } }); const context = vm.createContext(sandbox); let result = vm.runInContext('Object.hasOwnProperty(this, "propBase");', context); assert.strictEqual(result, false); // Ref: https://github.com/nodejs/node/issues/5350 base = Object.create(null); base.x = 1; base.y = 2; sandbox = Object.create(base); sandbox.z = 3; assert.deepStrictEqual(Object.keys(sandbox), ['z']); const code = 'x = 0; z = 4;'; result = vm.runInNewContext(code, sandbox); assert.strictEqual(result, 4); // Check that y is not an own property. assert.deepStrictEqual(Object.keys(sandbox), ['z', 'x']);