assertThat(StringUtil.defaultString(""), is(""));
        assertThat(StringUtil.defaultString("aaa"), is("aaa"));
    }

    /**
     *
     */
    @Test
    public void testDefaultStringDefaultStr() {
        assertThat(StringUtil.defaultString(null, "NULL"), is("NULL"));
        assertThat(StringUtil.defaultString("", "NULL"), is(""));
        assertThat(StringUtil.defaultString("aaa", "NULL"), is("aaa"));