tests: update test-dirstate to pass our import checker

tests/test-dirstate.t

@@ -1,88 +1,93
 ------ Test dirstate._dirs refcounting
 
   $ hg init t
   $ cd t
   $ mkdir -p a/b/c/d
   $ touch a/b/c/d/x
   $ touch a/b/c/d/y
   $ touch a/b/c/d/z
   $ hg ci -Am m
   adding a/b/c/d/x
   adding a/b/c/d/y
   adding a/b/c/d/z
   $ hg mv a z
   moving a/b/c/d/x to z/b/c/d/x (glob)
   moving a/b/c/d/y to z/b/c/d/y (glob)
   moving a/b/c/d/z to z/b/c/d/z (glob)
 
 Test name collisions
 
   $ rm z/b/c/d/x
   $ mkdir z/b/c/d/x
   $ touch z/b/c/d/x/y
   $ hg add z/b/c/d/x/y
   abort: file 'z/b/c/d/x' in dirstate clashes with 'z/b/c/d/x/y'
   [255]
   $ rm -rf z/b/c/d
   $ touch z/b/c/d
   $ hg add z/b/c/d
   abort: directory 'z/b/c/d' already in dirstate
   [255]
 
   $ cd ..
 
 Issue1790: dirstate entry locked into unset if file mtime is set into
 the future
 
 Prepare test repo:
 
   $ hg init u
   $ cd u
   $ echo a > a
   $ hg add
   adding a
   $ hg ci -m1
 
 Set mtime of a into the future:
 
   $ touch -t 202101011200 a
 
 Status must not set a's entry to unset (issue1790):
 
   $ hg status
   $ hg debugstate
   n 644          2 2021-01-01 12:00:00 a
 
 Test modulo storage/comparison of absurd dates:
 
 #if no-aix
   $ touch -t 195001011200 a
   $ hg st
   $ hg debugstate
   n 644          2 2018-01-19 15:14:08 a
 #endif
 
 Verify that exceptions during a dirstate change leave the dirstate
 coherent (issue4353)
 
   $ cat > ../dirstateexception.py <<EOF
-  > from mercurial import merge, extensions, error
+  > from __future__ import absolute_import
+  > from mercurial import (
+  >   error,
+  >   extensions,
+  >   merge,
+  > )
   > 
   > def wraprecordupdates(orig, repo, actions, branchmerge):
   >     raise error.Abort("simulated error while recording dirstateupdates")
   > 
   > def reposetup(ui, repo):
   >     extensions.wrapfunction(merge, 'recordupdates', wraprecordupdates)
   > EOF
 
   $ hg rm a
   $ hg commit -m 'rm a'
   $ echo "[extensions]" >> .hg/hgrc
   $ echo "dirstateex=../dirstateexception.py" >> .hg/hgrc
   $ hg up 0
   abort: simulated error while recording dirstateupdates
   [255]
   $ hg log -r . -T '{rev}\n'
   1
   $ hg status
   ? a