call site 7 for path.local.chdir
test/rsession/testing/test_hostmanage.py - line 283
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   def test_sethomedir():
->     old = py.path.local.get_temproot().chdir()
       try:
           sethomedir()
           curdir = py.path.local()
       finally:
           old.chdir()
   
       assert py.path.local._gethomedir() == curdir