repl: add tests

Author: piotrzarycki

test/parallel/test-repl-prevent-unwanted-autocompletion-on-enter.js

@@ -0,0 +1,34 @@
+'use strict';
+const repl = require('repl');
+const { describe, it } = require("node:test");
+const ArrayStream = require('../common/arraystream');
+const assert = require('assert');
+const outputStream = new ArrayStream();
+let accum = '';
+outputStream.write = (data) => accum += data.replace('\r', '');
+
+function prepareREPL() {
+  const replServer = repl.start({
+    prompt: '',
+    input: new ArrayStream(),
+    output: outputStream,
+    allowBlockingCompletions: true,
+  });
+
+
+  return replServer;
+}
+
+
+describe('REPL tab completion without side effects', () => {
+  const code = [
+    'typeof Reflect.construct',
+    'typeof Reflect.const',
+  ];
+
+  it(`should return values `, async () => {
+      const { replServer, input } = prepareREPL();
+      input.run(code);
+      assert.strictEqual(accum, '\'function\'\n\'undefined\'\n');
+  });
+});