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kotlinlang

<@U092N7GGG> Should source roots of different subfiles in test be isolated?
Assume .test file is
```
// FILE a/A.java
package a;
public class A{}

// FILE b/B.java
package b;
public class B{}
```

If isolated
```
someTempDir1(sources root for file 'A.java')
  - a
    - A.java
someTempDir2(sources root for file 'B.java')
  - b
    - B.java
```

Or 

```
someTempDir(sources root for all test)
  - a
    - A.java
  - b
    - B.java
```