1048: Updated tests for cookie.

 Make tests to work with an unvalid Base64 string and a Base64 string without encrypted content.

1048: Solved base64 problem with remember me cookie.

web/src/main/java/org/apache/shiro/web/mgt/CookieRememberMeManager.java

@@ -244,11 +244,11 @@ protected byte[] getRememberedSerializedIdentity(SubjectContext subjectContext)
      * @param base64 the base64 encoded String that may need to be padded
      * @return the base64 String padded if necessary.
      */
-    private String ensurePadding(String base64) {
+    protected String ensurePadding(String base64) {
         int length = base64.length();
         if (length % 4 != 0) {
             StringBuilder sb = new StringBuilder(base64);
-            for (int i = 0; i < length % 4; ++i) {
+            while (sb.length() % 4 != 0) {
                 sb.append('=');
             }
             base64 = sb.toString();