1'use strict'; 2require('../common'); 3const assert = require('assert'); 4 5process.env.foo = 'foo'; 6assert.strictEqual(process.env.foo, 'foo'); 7process.env.foo = undefined; 8assert.strictEqual(process.env.foo, 'undefined'); 9 10process.env.foo = 'foo'; 11assert.strictEqual(process.env.foo, 'foo'); 12delete process.env.foo; 13assert.strictEqual(process.env.foo, undefined); 14