tests: Add fuzzing harnesses for functions in addrdb.h, net_permissions.h and timedata.h #18417

  15 | +
  16 | +void test_one_input(const std::vector<uint8_t>& buffer)
  17 | +{
  18 | +    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
  19 | +    const std::string s = fuzzed_data_provider.ConsumeRandomLengthString(32);
  20 | +    const NetPermissionFlags net_permission_flags = fuzzed_data_provider.ConsumeBool() ? fuzzed_data_provider.PickValueInArray<NetPermissionFlags>({NetPermissionFlags::PF_NONE, NetPermissionFlags::PF_BLOOMFILTER, NetPermissionFlags::PF_RELAY, NetPermissionFlags::PF_FORCERELAY, NetPermissionFlags::PF_NOBAN, NetPermissionFlags::PF_MEMPOOL, NetPermissionFlags::PF_ISIMPLICIT, NetPermissionFlags::PF_ALL}) : static_cast<NetPermissionFlags>(fuzzed_data_provider.ConsumeIntegral<uint32_t>());

---

  20 | +    CMedianFilter<int64_t> median_filter{max_size, initial_value};
  21 | +    while (fuzzed_data_provider.remaining_bytes() > 0) {
  22 | +        (void)median_filter.median();
  23 | +        assert(median_filter.size() > 0);
  24 | +        assert(static_cast<size_t>(median_filter.size()) == median_filter.sorted().size());
  25 | +        assert(static_cast<unsigned int>(median_filter.size()) <= max_size || max_size == 0);

---

  37 | +            break;
  38 | +        }
  39 | +        }
  40 | +        return CBanEntry{};
  41 | +    }();
  42 | +    assert(!ban_entry.banReasonToString().empty());

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