final DocBoostMatcher docBoostMatcher = new DocBoostMatcher();
        docBoostMatcher.setMatchExpression("true");
        assertFalse(docBoostMatcher.match(null));
    }

    @Test
    public void test_match_emptyMap() {
        final DocBoostMatcher docBoostMatcher = new DocBoostMatcher();
        docBoostMatcher.setMatchExpression("true");
        assertFalse(docBoostMatcher.match(new HashMap<>()));
    }

    @Test