code: public static <T> T assertEquals(@Nullable final T etalon, @Nullable final T value) {
      if (etalon == null) {
        assertNull(value);
      } else {
        if (!(etalon == value || etalon.equals(value))) {
          final AssertionError error = new AssertionError("Value is not equal to etalon");
          MetaErrorListeners.fireError(error.getMessage(), error);
          throw error;
        }
      }
      return value;
    }
docs: Assert that value is equal to some etalon value.
  
  @param <T>    type of object to be checked.
  @param etalon etalon value
  @param value  value to check
  @return value if it is equal to etalon
  @throws AssertionError if the value id not equal to the etalon
  @since 1.1.1