params.put("key", "value");

        assertNotNull(rescorer1.evaluate(params));
        assertNull(rescorer2.evaluate(params));
    }

    public void test_evaluate_withDifferentParamTypes() {
        queryRescorer = new QueryRescorer() {
            @Override
            public RescorerBuilder<?> evaluate(Map<String, Object> params) {
                if (params == null) {