Split these guys onto multiple lines and make sure to follow the code style in terms of spaces around operators, etc. For example:

```
private def xmap(x: RDD[String], uc: UnserializableClass): RDD[String] = 
  x.map(y => uc.op(y))

private def xmapWith(x: RDD[String], uc: UnserializableClass): RDD[String] =
  x.mapWith(x => x.toString)((x,y) => x + uc.op(y))

...
```

Also, since this is in a test, there's no need to write `private`, and probably no need to start these things with `x`