public void testGetPartialConverterRemovedNull() {
        try {
            ConverterManager.getInstance().removePartialConverter(NullConverter.INSTANCE);
            try {
                ConverterManager.getInstance().getPartialConverter(null);
                fail();
            } catch (IllegalArgumentException ex) {}
        } finally {
            ConverterManager.getInstance().addPartialConverter(NullConverter.INSTANCE);
        }
        assertEquals(PARTIAL_SIZE, ConverterManager.getInstance().getPartialConverters().length);
    }