Scala: mock Hadoop File System - scala

Question

I need to mock (with scalamock 4.4.0/scalatest 3.2.9) the behaviour of Hadoop file system. I found out, that I can't mock it directly, so I'm trying to get around this problem.
On the first, try I created wrapper (in the scope of main logic):
class HadoopFsWrapper(path: Path)(implicit fs: org.apache.hadoop.fs.FileSystem) {
def listStatus(path) = fs.listStatus(path)
}
class HadoopService(path: Path)(implicit val fs: HadoopFsWrapper){
def someLogic() = fs.listStatus(path)
}
I declare this class both in main and test code with defining of implicit HadoopFsWrapper.
implicit val fs = mock[HadoopFsWrapper]
val hs = HadoopService(path)
// other test logic
And this done well.
But I don't think, its a good idea to modify main code for test purpose.
Other way I considered is to create wrapper only in test scope and apply some kind of "decorator" to deceive HadoopService, which expects FileSystem to be defined in main scope:
// only in test scope
class HadoopFsWrapper(path: Path) extends org.apache.hadoop.fs.FileSystem {
def listStatus(path) = listStatus(path)
// dummies for implemented FileSystem-methods
}
object HadoopFsWrapper {
def apply(): org.apache.hadoop.fs.FileSystem = new HadoopFsWrapper
}
// main logic
class HadoopService(path: Path)(implicit val fs: org.apache.hadoop.fs.FileSystem){
def someLogic() = fs.listStatus(path)
}
But when I'm trying to mock HadoopFsWrapper it's defined as null.