tests/test-mq-safety

use 'x is None' instead of 'x == None'

The built-in None object is a singleton and it is therefore safe to
compare memory addresses with is. It is also faster, how much depends
on the object being compared. For a simple type like str I get:

            | s = "foo" | s = None
  ----------+-----------+----------
  s == None | 0.25 usec | 0.21 usec
  s is None | 0.17 usec | 0.17 usec

#!/bin/sh

echo '[extensions]' >> $HGRCPATH
echo 'hgext.mq =' >> $HGRCPATH

hg init repo
cd repo

echo foo > foo
hg ci -qAm 'add a file'

hg qinit

hg qnew foo
echo foo >> foo
hg qrefresh -m 'append foo'

hg qnew bar
echo bar >> foo
hg qrefresh -m 'append bar'

echo '% try to commit on top of a patch'
echo quux >> foo
hg ci -m 'append quux'

# cheat a bit...
mv .hg/patches .hg/patches2
hg ci -m 'append quux'
mv .hg/patches2 .hg/patches

echo '% qpop/qrefresh on the wrong revision'
hg qpop
hg qpop -n patches 2>&1 | sed -e 's/\(using patch queue:\).*/\1/'
hg qrefresh

hg up -C qtip
echo '% qpop'
hg qpop

echo '% qrefresh'
hg qrefresh

echo '% tip:'
hg tip --template '{rev} {desc}\n'