tests/test-mq-qfold

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 "mq=" >> $HGRCPATH

filterdiff()
{
    grep -v diff | \
	sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
	-e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"
}

echo '% init'
hg init repo
cd repo
echo a > a
hg ci -Am adda
echo a >> a
hg qnew -f p1
echo b >> a
hg qnew -f p2
echo c >> a
hg qnew -f p3
echo '% fold in the middle of the queue'
hg qpop p1
hg qdiff | filterdiff
hg qfold p2
hg qser
hg qdiff | filterdiff
echo '% fold with local changes'
echo d >> a
hg qfold p3
hg diff -c . | filterdiff
cd ..