diff --git a/test/convert.js b/test/convert.js
index 643cde8..2e8b510 100644
--- a/test/convert.js
+++ b/test/convert.js
@@ -25,4 +25,23 @@ describe('convert', function() {
         assert.equal(hex.length, 512);
         assert.deepEqual(convert.hexToBytes(hex), bytes);
     })
+
+    describe('bytesToBase64', function() {
+        it('passes RFC4648 test vectors', function() {
+            // Test vectors from:
+            // http://tools.ietf.org/html/rfc4648#page-12
+
+            var b64 = function(s) {
+                return convert.bytesToBase64(convert.stringToBytes(s))
+            }
+
+            assert.equal(b64(''), '')
+            assert.equal(b64('f'), 'Zg==')
+            assert.equal(b64('fo'), 'Zm8=')
+            assert.equal(b64('foo'), 'Zm9v')
+            assert.equal(b64('foob'), 'Zm9vYg==')
+            assert.equal(b64('fooba'), 'Zm9vYmE=')
+            assert.equal(b64('foobar'), 'Zm9vYmFy')
+        })
+    })
 })