//       fallback: chain
				leaf := NewSourceIP()
				leaf.Map["1.2.3.4"] = ToChain("chain")

				inner := NewDestinationIP()
				inner.OnNoMatch = ToMatcher(leaf.Matcher)

				root := NewDestinationPort()
				root.OnNoMatch = ToMatcher(inner.Matcher)
				return root
			},
			want: func() *matcher.Matcher {
				// src port
				// 15001: chain
				want := NewSourceIP()

			Action: &xds.TypedExtensionConfig{
				Name:        name,
				TypedConfig: protoconv.MessageToAny(&wrappers.StringValue{Value: name}),
			},
		},
	}
}

func ToMatcher(match *matcher.Matcher) *matcher.Matcher_OnMatch {
	return &matcher.Matcher_OnMatch{
		OnMatch: &matcher.Matcher_OnMatch_Matcher{
			Matcher: match,
		},
	}
}