ConfigResponse get(ConfigCacheKey key) {
        PayloadChecksum xxhash64 = checksums.get(key);
        if (xxhash64 == null) return null;
        return checksumToConfig.get(xxhash64);
    }
@Test
    public void testThatCacheWorksWithDifferentKeySameMd5() {
        assertSame(cache.get(fooBarCacheKey), cache.get(bazQuuxCacheKey));
    }