@Test
    public void testBasicFromConsumerConfig() {
        newFetchConfigFromConsumerConfig();
        newFetchConfigFromValues();
    }
Verify correctness if both the key and value {@link Deserializer deserializers} provided to the
{@link FetchConfig} constructors are {@code nonnull}.
clients/src/test/java/org/apache/kafka/clients/consumer/internals/FetchConfigTest.java