assertNull(result);

        result = (String) method.invoke(keyMatchHelper, "");
        assertEquals("", result);

        result = (String) method.invoke(keyMatchHelper, "Test123");
        assertEquals("test123", result);
    }

    @Test
    public void test_buildQuery_caseSensitivity() {
        List<String> keywordList = Arrays.asList("Java", "JAVA", "java");

        assertProvideThrowsException("123");
        assertProvideThrowsException("0");
        assertProvideThrowsException("-1");
        assertProvideThrowsException("Test123");
        assertProvideThrowsException("123Test");
        assertProvideThrowsException("Test123Classification");
    }

    @Test
    public void test_provide_withLongClassificationName() {