shared: add independent IPv4 and IPv6 collection [CI]

backend/shared/tests/MoShiro.Protocol.Tests/RawChunkCodecTests.cs

@@ -8,6 +8,21 @@ namespace MoShiro.Protocol.Tests;
 
 public sealed class RawChunkCodecTests
 {
+    [Fact]
+    public void Header_LegacyDefaultsToIpv4_AndIpv6RoundTripsToAnIndependentSeries()
+    {
+        RawChunkHeader legacy = System.Text.Json.JsonSerializer.Deserialize("{\"probe_id\":\"prb_legacy\"}", MoShiroJsonContext.Default.RawChunkHeader)!;
+        Assert.Equal(IpVersions.V4, legacy.IpVersion);
+        Assert.Equal("line:prb_legacy", legacy.Series);
+        RawChunk chunk = SampleChunk();
+        chunk.Header.ProbeId = new ProbeId("prb_dual");
+        chunk.Header.IpVersion = IpVersions.V6;
+        RawChunk decoded = RawChunkCodec.Decode(RawChunkCodec.Encode(chunk)).Value;
+        Assert.Equal("ipv6", decoded.Header.IpVersion);
+        Assert.Equal("line:prb_dual:ipv6", decoded.Header.Series);
+        Assert.Equal(chunk.Find("msg")!.Count, decoded.Find("msg")!.Count);
+    }
+
     private static readonly NodeId s_agent = new("agt_test");
 
     private static RawChunk SampleChunk()