add tests for invalid addr to net servers

internal/module/test/tcp-server_test.go

@@ -88,6 +88,15 @@ func TestBadTCPServer(t *testing.T) {
 			},
 			errorString: "net.tcp.server ip must be a string",
 		},
+		{
+			name: "invalid addr",
+			params: map[string]any{
+				"ip":      "127.0.0.",
+				"port":    8000.0,
+				"framing": "LF",
+			},
+			errorString: "lookup 127.0.0.: no such host",
+		},
 	}
 
 	for _, test := range tests {