add failing test for decoding url-safe style base64

test/url-safe.js

@@ -0,0 +1,11 @@
+var test = require('tape'),
+  b64 = require('../lib/b64');
+
+test('decode url-safe style base64 strings', function (t) {
+  var expected = [0xff, 0xff, 0xbe, 0xff, 0xef, 0xbf, 0xfb, 0xef, 0xff];
+  
+  t.deepEqual(b64.toByteArray('//++/++/++//'), expected);
+  t.deepEqual(b64.toByteArray('__--_--_--__'), expected);
+  
+  t.end();
+});