code: public static void isTrue (@Nonnull final BooleanSupplier aValue, final String sMsg)
    {
      if (isEnabled ())
        isTrue (aValue, () -> sMsg);
    }
docs: Check that the passed value is <code>true</code>.
  
  @param aValue
  The value to check.
  @param sMsg
  The message to be emitted in case the value is <code>false</code>
  @throws IllegalArgumentException
  if the passed value is not <code>null</code>.