tests/test-mq-strip

Add support for multiple possible bisect results (issue1228, issue1182)

The real reason for both issue is that bisect can not handle cases where there
are multiple possibilities for the result.

Example (from issue1228):
rev 0 -> good
rev 1 -> skipped
rev 2 -> skipped
rev 3 -> skipped
rev 4 -> bad

Note that this patch does not only fix the reported Assertion Error but also
the problem of a non converging bisect:

hg init
for i in `seq 3`; do echo $i > $i; hg add $i; hg ci -m$i; done
hg bisect -b 2
hg bisect -g 0
hg bisect -s

From this state on, you can:
 a) mark as bad forever (non converging!)
 b) mark as good to get an inconsistent state
 c) skip for the Assertion Error

Minor description and code edits by pmezard.

echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH

teststrip() {
    hg up -C $1
    echo % before update $1, strip $2
    hg parents
    hg strip $2 2>&1 | sed 's/\(saving bundle to \).*/\1/'
    echo % after update $1, strip $2
    hg parents
    hg unbundle -q .hg/strip-backup/*
    rm .hg/strip-backup/*
}

hg init test
cd test

echo foo > bar
hg ci -Ama

echo more >> bar
hg ci -Amb

echo blah >> bar
hg ci -Amc

hg up 1
echo blah >> bar
hg ci -Amd

echo final >> bar
hg ci -Ame

hg log

teststrip 4 4
teststrip 4 3
teststrip 1 4
teststrip 4 2
teststrip 4 1
teststrip null 4

hg log

hg up -C 2
hg merge 4
echo % before strip of merge parent
hg parents
hg strip 4 2>&1 | sed 's/\(saving bundle to \).*/\1/'
echo % after strip of merge parent
hg parents