Override a list property for Typesafe Config

Today I naively was trying to override a list property for a unit test with the following code

System.setProperty("list.property", """[ "val1", "val2"]""")  

The tested code is reading the list property using typesafe config library

val listProperty = config.getListString.asScala.toSet  

That was throwing
com.typesafe.config.ConfigException$WrongType: system properties: list.property has type STRING rather than LIST

so I've googled a solution for overriding list properties from command line, which is same for overriding in code

Here is how it looks now

System.setProperty("list.property.0", "val1")  
System.setProperty("list.property.1", "val2")