add test case

Author: tmshn

ip_test.go

@@ -124,6 +124,11 @@ func TestExtractIP(t *testing.T) {
 			ExtractIPFromXFFHeader(TrustIPRanges(ipForXFF3ExternalRange)),
 			[]string{ipForRemoteAddrExternal, ipForRemoteAddrExternal, ipForRemoteAddrExternal, ipForRemoteAddrExternal, ipForXFF5External, ipForRemoteAddrLoopback},
 		},
+		"ExtractIPFromXFFHeader(trust too many proxies)": {
+			// This trusts private network also after "additional" trust ranges unlike `TrustNProxies(1)` doesn't
+			ExtractIPFromXFFHeader(TrustNProxies(99)),
+			[]string{ipForRemoteAddrExternal, ipForRemoteAddrExternal, ipForXFF6External, ipForXFF6External, ipForXFF6External, ipForRemoteAddrLoopback},
+		},
 	}
 	for name, test := range tests {
 		for i, req := range requests {