test: complete coverage of buffer

PR-URL: https://github.com/nodejs/node/pull/12831
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/test/parallel/test-buffer-bytelength.js b/test/parallel/test-buffer-bytelength.js
index b140478933..09e59743e4 100644
--- a/test/parallel/test-buffer-bytelength.js
+++ b/test/parallel/test-buffer-bytelength.js
@@ -106,3 +106,12 @@ assert.strictEqual(Buffer.byteLength('Il était tué', 'utf8'), 14);
 // Test that ArrayBuffer from a different context is detected correctly
 const arrayBuf = vm.runInNewContext('new ArrayBuffer()');
 assert.strictEqual(Buffer.byteLength(arrayBuf), 0);
+
+// Verify that invalid encodings are treated as utf8
+for (let i = 1; i < 10; i++) {
+  const encoding = String(i).repeat(i);
+
+  assert.ok(!Buffer.isEncoding(encoding));
+  assert.strictEqual(Buffer.byteLength('foo', encoding),
+                     Buffer.byteLength('foo', 'utf8'));
+}