1const assert = require('assert'); 2const inspector = require('inspector'); 3 4 5assert.strictEqual(inspector.url(), undefined); 6inspector.open(0, undefined, false); 7assert(inspector.url().startsWith('ws://')); 8assert.throws(() => { 9 inspector.open(0, undefined, false); 10}, { 11 code: 'ERR_INSPECTOR_ALREADY_ACTIVATED' 12}); 13inspector.close(); 14assert.strictEqual(inspector.url(), undefined); 15