Using reflection to change static final File.separatorChar for unit testing?

Question

Specifically, I\'m trying to create a unit test for a method which requires uses File.separatorChar to build paths on windows and unix. The code must run on bot

Answer 1

Try invoking on an instance of file not on an instance of class File

E.g.

File file = ...;    
field.setChar(file,'/');

You could also try http://code.google.com/p/jmockit/ and mock the static method FileSystem.getFileSystem(). (don't know if you can mock static variables, normally those hacks shouldn't be necessary -> write oo code and use 'only' mockito)