test/parallel/test-repl-save-load.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';

const common = require('../common');
const { startNewREPLServer } = require('../common/repl');
const assert = require('node:assert');
const fs = require('node:fs');
const path = require('node:path');

const tmpdir = require('../common/tmpdir');
tmpdir.refresh();

// Tests that a REPL session data can be saved to and loaded from a file

const { replServer, input } = startNewREPLServer({ terminal: false });

const filePath = path.resolve(tmpdir.path, 'test.save.js');

const testFileContents = [
  'let inner = (function() {',
  '  return {one:1};',
  '})()',
];

input.run(testFileContents);
input.run([`.save ${filePath}`]);

assert.strictEqual(fs.readFileSync(filePath, 'utf8'),
                   testFileContents.join('\n'));

const innerOCompletions = [['inner.one'], 'inner.o'];

// Double check that the data is still present in the repl after the save
replServer.completer('inner.o', common.mustSucceed((data) => {
  assert.deepStrictEqual(data, innerOCompletions);
}));

// Clear the repl context
input.run(['.clear']);

// Double check that the data is no longer present in the repl
replServer.completer('inner.o', common.mustSucceed((data) => {
  assert.deepStrictEqual(data, [[], 'inner.o']);
}));

// Load the file back in.
input.run([`.load ${filePath}`]);

// Make sure loading doesn't insert extra indentation
// https://github.com/nodejs/node/issues/47673
assert.strictEqual(replServer.line, '');

// Make sure that the loaded data is present
replServer.complete('inner.o', common.mustSucceed((data) => {
  assert.deepStrictEqual(data, innerOCompletions);
}));

replServer.close();