code: @FactoryMethod
      public static NotNullExpectation create(String expected )
      {
          String normalized = normalizeSpace(replaceChars(expected, '\u00A0', ' '));
          return "not null".equalsIgnoreCase(normalized) ?
                 new NotNullExpectation() :
                 null;
      }
docs: <p>create.</p>
  
  @param expected a {@link String} object.
  @return a {@link NotNullExpectation} object.