String result = chain.normalize(null, "field");

        assertEquals(null, result);
    }

    @Test(expected = IllegalArgumentException.class)
    public void test_addNullNormalizer() throws Exception {
        NormalizerChain chain = new NormalizerChain();
        chain.add(null);
    }

    @Test
    public void test_chainWithNormalizerReturningNull() throws Exception {