--- a/tests/test-dirstate-race.t	Fri Jun 02 10:44:40 2017 +0200
+++ b/tests/test-dirstate-race.t	Fri Jun 02 22:27:52 2017 -0700
@@ -1,4 +1,5 @@
-  $ hg init
+  $ hg init repo
+  $ cd repo
   $ echo a > a
   $ hg add a
   $ hg commit -m test
@@ -31,3 +32,62 @@
   M a
   M a
 
+  $ echo test > b
+  $ mkdir dir1
+  $ echo test > dir1/c
+  $ echo test > d
+
+  $ echo test > e
+#if execbit
+A directory will typically have the execute bit -- make sure it doesn't get
+confused with a file with the exec bit set
+  $ chmod +x e
+#endif
+
+  $ hg add b dir1 d e
+  adding dir1/c
+  $ hg commit -m test2
+
+  $ cat >> $TESTTMP/dirstaterace.py << EOF
+  > from mercurial import (
+  >     context,
+  >     extensions,
+  > )
+  > def extsetup():
+  >     extensions.wrapfunction(context.workingctx, '_checklookup', overridechecklookup)
+  > def overridechecklookup(orig, self, files):
+  >     # make an update that changes the dirstate from underneath
+  >     self._repo.ui.system(self._repo.ui.config('dirstaterace', 'command'), cwd=self._repo.root)
+  >     return orig(self, files)
+  > EOF
+
+  $ hg debugrebuilddirstate
+  $ hg debugdirstate
+  n   0         -1 unset               a
+  n   0         -1 unset               b
+  n   0         -1 unset               d
+  n   0         -1 unset               dir1/c
+  n   0         -1 unset               e
+
+XXX Note that this returns M for files that got replaced by directories. This is
+definitely a bug, but the fix for that is hard and the next status run is fine
+anyway.
+
+  $ hg status --config extensions.dirstaterace=$TESTTMP/dirstaterace.py \
+  >   --config dirstaterace.command='rm b && rm -r dir1 && rm d && mkdir d && rm e && mkdir e'
+  M d
+  M e
+  ! b
+  ! dir1/c
+  $ hg debugdirstate
+  n 644          2 * a (glob)
+  n   0         -1 unset               b
+  n   0         -1 unset               d
+  n   0         -1 unset               dir1/c
+  n   0         -1 unset               e
+
+  $ hg status
+  ! b
+  ! d
+  ! dir1/c
+  ! e