if filter.ProxyPrefixMatch != tt.expectedVersionPrefix {
				t.Errorf("unexpected prefix: got %v wanted %v", filter.ProxyPrefixMatch, tt.expectedVersionPrefix)
			}
			for ver, match := range tt.matches {
				got := proxyMatch(&Proxy{Metadata: &NodeMetadata{IstioVersion: ver}}, filter)
				if got != match {
					t.Errorf("expected %v to match %v, got %v", ver, match, got)
				}
			}
		})
	}
}

				cpw.Operation = networking.EnvoyFilter_Patch_ADD
			}
		}
		out.Patches[cp.ApplyTo] = append(out.Patches[cp.ApplyTo], cpw)
	}
	return out
}

func proxyMatch(proxy *Proxy, cp *EnvoyFilterConfigPatchWrapper) bool {
	if cp.Match.Proxy == nil {
		return true
	}

	if cp.ProxyPrefixMatch != "" {
		if !strings.HasPrefix(proxy.Metadata.IstioVersion, cp.ProxyPrefixMatch) {

		}
		// merge EnvoyFilterWrapper
		for _, efw := range matchedEnvoyFilters {
			for applyTo, cps := range efw.Patches {
				for _, cp := range cps {
					if proxyMatch(proxy, cp) {
						out.Patches[applyTo] = append(out.Patches[applyTo], cp)
					}
				}
			}
		}
	}

	return out
}