code: public void clazz(String unexpectedClass) {
          String clazz = checkClazz(unexpectedClass, 0, 0);
          assertNotNull(NO_ELEMENT_FOUND, clazz);
          assertFalse("Class Mismatch: class of '" + clazz + CONTAINS + unexpectedClass + "'", clazz.contains(unexpectedClass));
      }
docs: Asserts that the element's class does not contain the provided expected
  class. If the element isn't present, this will constitute a failure, same
  as a mismatch. This information will be logged and recorded, with a
  screenshot for traceability and added debugging support.
  
  @param unexpectedClass - the unexpected class value