tests/test-add

move __del__ from httprepository to basehttphandler

This should prevent the next patch from reopening an issue fixed by
0d94e4a3ddb4.

#!/bin/sh

hg init a
cd a
echo a > a
hg add -n
hg st
hg add
hg st

echo b > b
hg add -n b
hg st
hg add b
hg st
echo % should fail
hg add b
hg st

hg ci -m 0
echo % should fail
hg add a

echo aa > a
hg ci -m 1
hg up 0
echo aaa > a
hg ci -m 2

hg merge
hg st
echo % should fail
hg add a
hg st
hg ci -m merge

echo % issue683
hg rm a
hg st
echo a > a
hg add a
hg st