$ cat <<EOF >> $HGRCPATH

  > [extensions]

  > purge =

  > EOF

  $ hg init test

  $ cd test

  $ echo a > changed

  $ echo a > removed

  $ echo a > source

  $ hg ci -Am addfiles

  adding changed

  adding removed

  adding source

  $ echo a >> changed

  $ echo a > added

  $ hg add added

  $ hg rm removed

  $ hg cp source copied

  $ hg diff --git > ../unknown.diff

Test adding on top of an unknown file

  $ hg up -qC 0

  $ hg purge

  $ echo a > added

  $ hg import --no-commit ../unknown.diff

  applying ../unknown.diff

  file added already exists

  1 out of 1 hunks FAILED -- saving rejects to file added.rej

  abort: patch failed to apply

  [20]

Test modifying an unknown file

  $ hg revert -aq

  $ hg purge

  $ hg rm changed

  $ hg ci -m removechanged

  $ echo a > changed

  $ hg import --no-commit ../unknown.diff

  applying ../unknown.diff

  abort: cannot patch changed: file is not tracked

  [20]

Test removing an unknown file

  $ hg up -qC 0

  $ hg purge

  $ hg rm removed

  $ hg ci -m removeremoved

  created new head

  $ echo a > removed

  $ hg import --no-commit ../unknown.diff

  applying ../unknown.diff

  abort: cannot patch removed: file is not tracked

  [20]

Test copying onto an unknown file

  $ hg up -qC 0

  $ hg purge

  $ echo a > copied

  $ hg import --no-commit ../unknown.diff

  applying ../unknown.diff

  abort: cannot create copied: destination already exists

  [20]

  $ cd ..