test: increase coverage of buffer

Increase coverage of lib/buffer.js.

PR-URL: https://github.com/nodejs/node/pull/12714
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/test/parallel/test-buffer-write.js b/test/parallel/test-buffer-write.js
new file mode 100644
index 0000000000..80c95dda44
--- /dev/null
+++ b/test/parallel/test-buffer-write.js
@@ -0,0 +1,55 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const outsideBounds = /^RangeError: Attempt to write outside buffer bounds$/;
+
+assert.throws(() => Buffer.alloc(9).write('foo', -1), outsideBounds);
+assert.throws(() => Buffer.alloc(9).write('foo', 10), outsideBounds);
+
+const resultMap = new Map([
+  ['utf8', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
+  ['ucs2', Buffer.from([102, 0, 111, 0, 111, 0, 0, 0, 0])],
+  ['ascii', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
+  ['latin1', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
+  ['binary', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
+  ['utf16le', Buffer.from([102, 0, 111, 0, 111, 0, 0, 0, 0])],
+  ['base64', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
+  ['hex', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])]
+]);
+
+// utf8, ucs2, ascii, latin1, utf16le
+const encodings = ['utf8', 'utf-8', 'ucs2', 'ucs-2', 'ascii', 'latin1',
+                   'binary', 'utf16le', 'utf-16le'];
+
+encodings
+  .reduce((es, e) => es.concat(e, e.toUpperCase()), [])
+  .forEach((encoding) => {
+    const buf = Buffer.alloc(9);
+    const len = Buffer.byteLength('foo', encoding);
+    assert.strictEqual(buf.write('foo', 0, len, encoding), len);
+
+    if (encoding.indexOf('-') !== -1)
+      encoding = encoding.replace('-', '');
+
+    assert.deepStrictEqual(buf, resultMap.get(encoding.toLowerCase()));
+  });
+
+// base64
+['base64', 'BASE64'].forEach((encoding) => {
+  const buf = Buffer.alloc(9);
+  const len = Buffer.byteLength('Zm9v', encoding);
+
+  assert.strictEqual(buf.write('Zm9v', 0, len, encoding), len);
+  assert.deepStrictEqual(buf, resultMap.get(encoding.toLowerCase()));
+});
+
+// hex
+['hex', 'HEX'].forEach((encoding) => {
+  const buf = Buffer.alloc(9);
+  const len = Buffer.byteLength('666f6f', encoding);
+
+  assert.strictEqual(buf.write('666f6f', 0, len, encoding), len);
+  assert.deepStrictEqual(buf, resultMap.get(encoding.toLowerCase()));
+});