tests/test-mq-qimport-fail-cleanup.t

repoview: extract a factory function of proxy class

This makes sure that dynamically-created class objects are isolated from
local binding of repo instances. The type cache is moved to module level
as it isn't tied to each instance.

Failed qimport of patches from files should cleanup by recording successfully
imported patches in series file.

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH
  $ hg init repo
  $ cd repo
  $ echo a > a
  $ hg ci -Am'add a'
  adding a
  $ cat >b.patch<<EOF
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,2 @@
  >  a
  > +b
  > EOF

empty series

  $ hg qseries

qimport valid patch followed by invalid patch

  $ hg qimport b.patch fakepatch
  adding b.patch to series file
  abort: unable to read file fakepatch
  [255]

valid patches before fail added to series

  $ hg qseries
  b.patch

  $ hg pull -q -r 0 . # update phase
  $ hg qimport -r 0
  abort: revision 0 is not mutable
  (see 'hg help phases' for details)
  [255]

  $ cd ..