diff --git a/src/handlers/flow/test_flows.cpp b/src/handlers/flow/test_flows.cpp
index 675b55570..e2d6d3b47 100644
--- a/src/handlers/flow/test_flows.cpp
+++ b/src/handlers/flow/test_flows.cpp
@@ -661,3 +661,128 @@ TEST_CASE("Flow specialized_merge + to_prometheus + to_opentelemetry with all gr
     target->to_opentelemetry(scope, start_ts, end_ts, {});
     CHECK(otel_gauge_value(scope, "flow_records_flows") == pre_b1 + pre_b2);
 }
+
+// The fixtures below were hand-rolled to exercise parser branches the
+// pre-existing nf5/nf9/ipfix/ecmp captures don't touch — NetflowData.h's
+// v1 and v7 dispatch arms and SflowData.h's IPv6 sample-header path.
+
+TEST_CASE("Parse netflow v1 stream", "[netflow][flow]")
+{
+    FlowInputStream stream{"netflow-v1-test"};
+    stream.config_set("flow_type", "netflow");
+    stream.config_set("pcap_file", "tests/fixtures/nf1.pcap");
+
+    visor::Config c;
+    auto stream_proxy = stream.add_event_proxy(c);
+    c.config_set<uint64_t>("num_periods", 1);
+    FlowStreamHandler flow_handler{"flow-v1", stream_proxy, &c};
+
+    flow_handler.start();
+    stream.start();
+    stream.stop();
+    flow_handler.stop();
+
+    auto event_data = flow_handler.metrics()->bucket(0)->event_data_locked();
+    CHECK(event_data.num_events->value() == 1);
+    CHECK(event_data.num_samples->value() == 1);
+
+    nlohmann::json j;
+    flow_handler.metrics()->bucket(0)->to_json(j);
+    // Fixture has 2 v1 records (UDP + TCP) sourced from 10.0.0.1.
+    CHECK(j["devices"]["10.0.0.1"]["records_flows"] == 2);
+}
+
+TEST_CASE("Parse netflow v7 stream", "[netflow][flow]")
+{
+    FlowInputStream stream{"netflow-v7-test"};
+    stream.config_set("flow_type", "netflow");
+    stream.config_set("pcap_file", "tests/fixtures/nf7.pcap");
+
+    visor::Config c;
+    auto stream_proxy = stream.add_event_proxy(c);
+    c.config_set<uint64_t>("num_periods", 1);
+    FlowStreamHandler flow_handler{"flow-v7", stream_proxy, &c};
+
+    flow_handler.start();
+    stream.start();
+    stream.stop();
+    flow_handler.stop();
+
+    auto event_data = flow_handler.metrics()->bucket(0)->event_data_locked();
+    CHECK(event_data.num_events->value() == 1);
+    CHECK(event_data.num_samples->value() == 1);
+
+    nlohmann::json j;
+    flow_handler.metrics()->bucket(0)->to_json(j);
+    // Fixture has 2 v7 records (UDP + TCP) from agent 10.0.0.1.
+    CHECK(j["devices"]["10.0.0.1"]["records_flows"] == 2);
+}
+
+TEST_CASE("Parse sflow IPv6 sample", "[sflow][flow]")
+{
+    FlowInputStream stream{"sflow-ipv6-test"};
+    stream.config_set("flow_type", "sflow");
+    stream.config_set("pcap_file", "tests/fixtures/sflow_ipv6.pcap");
+
+    visor::Config c;
+    auto stream_proxy = stream.add_event_proxy(c);
+    c.config_set<uint64_t>("num_periods", 1);
+    FlowStreamHandler flow_handler{"flow-sflow-v6", stream_proxy, &c};
+
+    flow_handler.start();
+    stream.start();
+    stream.stop();
+    flow_handler.stop();
+
+    auto event_data = flow_handler.metrics()->bucket(0)->event_data_locked();
+    // Single sFlow datagram with one flow sample carrying an IPv6 packet.
+    CHECK(event_data.num_events->value() == 1);
+    CHECK(event_data.num_samples->value() == 1);
+
+    nlohmann::json j;
+    flow_handler.metrics()->bucket(0)->to_json(j);
+    auto &dev = j["devices"]["10.0.0.99"];
+    CHECK(dev["records_flows"] == 1);
+    // Embedded payload is IPv6/UDP; assert IPv6-specific counters to
+    // prove decodeIPV6 actually ran (a bare records_flows check would
+    // still pass if the protocol classification regressed).
+    CHECK(dev["interfaces"]["1"]["in_ipv6_packets"] == 1);
+    CHECK(dev["interfaces"]["1"]["in_udp_packets"] == 1);
+}
+
+TEST_CASE("Parse sflow IPv4/IPv6 keyed sample elements", "[sflow][flow]")
+{
+    // Two flow_samples in the datagram, each carrying a non-header element:
+    //   SFLFLOW_IPV4 (tag=3) → readFlowSample_IPv4 in SflowData.h
+    //   SFLFLOW_IPV6 (tag=4) → readFlowSample_IPv6 in SflowData.h
+    // Existing sflow fixtures only emit SFLFLOW_HEADER (tag=1).
+    FlowInputStream stream{"sflow-keyed-test"};
+    stream.config_set("flow_type", "sflow");
+    stream.config_set("pcap_file", "tests/fixtures/sflow_keyed.pcap");
+
+    visor::Config c;
+    auto stream_proxy = stream.add_event_proxy(c);
+    c.config_set<uint64_t>("num_periods", 1);
+    FlowStreamHandler flow_handler{"flow-sflow-keyed", stream_proxy, &c};
+
+    flow_handler.start();
+    stream.start();
+    stream.stop();
+    flow_handler.stop();
+
+    auto event_data = flow_handler.metrics()->bucket(0)->event_data_locked();
+    CHECK(event_data.num_events->value() == 1);
+    CHECK(event_data.num_samples->value() == 1);
+
+    nlohmann::json j;
+    flow_handler.metrics()->bucket(0)->to_json(j);
+    auto &dev = j["devices"]["10.0.0.77"];
+    CHECK(dev["records_flows"] == 2);
+    // The IPv4 element: src 192.0.2.10 → dst 192.0.2.20, TCP, length 1500.
+    // The IPv6 element: src 2001:db8::1 → dst 2001:db8::2, UDP, length 1280.
+    auto &iface = dev["interfaces"]["1"];
+    CHECK(iface["in_ipv4_packets"] == 1);
+    CHECK(iface["in_ipv6_packets"] == 1);
+    CHECK(iface["in_tcp_bytes"] == 1500);
+    CHECK(iface["in_udp_bytes"] == 1280);
+}
diff --git a/src/tests/fixtures/nf1.pcap b/src/tests/fixtures/nf1.pcap
new file mode 100644
index 000000000..352e287ed
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diff --git a/src/tests/fixtures/nf7.pcap b/src/tests/fixtures/nf7.pcap
new file mode 100644
index 000000000..0ac9de72b
Binary files /dev/null and b/src/tests/fixtures/nf7.pcap differ
diff --git a/src/tests/fixtures/sflow_ipv6.pcap b/src/tests/fixtures/sflow_ipv6.pcap
new file mode 100644
index 000000000..12e9f8640
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diff --git a/src/tests/fixtures/sflow_keyed.pcap b/src/tests/fixtures/sflow_keyed.pcap
new file mode 100644
index 000000000..ce7b02561
Binary files /dev/null and b/src/tests/fixtures/sflow_keyed.pcap differ