1 files changed, 53 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-readline-undefined-columns.js b/tests/node_compat/test/parallel/test-readline-undefined-columns.js
new file mode 100644
index 000000000..e41798ae3
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-readline-undefined-columns.js
@@ -0,0 +1,53 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const PassThrough = require('stream').PassThrough;
+const readline = require('readline');
+
+common.skipIfDumbTerminal();
+
+// Checks that tab completion still works
+// when output column size is undefined
+
+const iStream = new PassThrough();
+const oStream = new PassThrough();
+
+readline.createInterface({
+  terminal: true,
+  input: iStream,
+  output: oStream,
+  completer: function(line, cb) {
+    cb(null, [['process.stdout', 'process.stdin', 'process.stderr'], line]);
+  }
+});
+
+let output = '';
+
+oStream.on('data', function(data) {
+  output += data;
+});
+
+oStream.on('end', common.mustCall(() => {
+  const expect = 'process.stdout\r\n' +
+                 'process.stdin\r\n' +
+                 'process.stderr';
+  assert.match(output, new RegExp(expect));
+}));
+
+iStream.write('process.s\t');
+
+// Completion works.
+assert.match(output, /process\.std\b/);
+// Completion doesn’t show all results yet.
+assert.doesNotMatch(output, /stdout/);
+
+iStream.write('\t');
+oStream.end();