nodejs/test/parallel/test-repl-autolibs.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
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// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');
const ArrayStream = require('../common/arraystream');
const assert = require('assert');
const util = require('util');
const repl = require('repl');

const putIn = new ArrayStream();
repl.start('', putIn, null, true);

test1();

function test1() {
  let gotWrite = false;
  putIn.write = function(data) {
    gotWrite = true;
    if (data.length) {

      // Inspect output matches repl output
      assert.strictEqual(data,
                         `${util.inspect(require('fs'), null, 2, false)}\n`);
      // Globally added lib matches required lib
      assert.strictEqual(globalThis.fs, require('fs'));
      test2();
    }
  };
  assert(!gotWrite);
  putIn.run(['fs']);
  assert(gotWrite);
}

function test2() {
  let gotWrite = false;
  putIn.write = function(data) {
    gotWrite = true;
    if (data.length) {
      // REPL response error message
      assert.strictEqual(data, '{}\n');
      // Original value wasn't overwritten
      assert.strictEqual(val, globalThis.url);
    }
  };
  const val = {};
  globalThis.url = val;
  common.allowGlobals(val);
  assert(!gotWrite);
  putIn.run(['url']);
  assert(gotWrite);
}