dirstate: add test for non-normal set consistency
This adds a test extension to check that the non-normal set contains the
expected entries. It wraps several methods of the dirstate to check that
the non-normal set has the correct values before and after the call. The
extension lives in contrib so that paranoid developers can easily
enable it to make sure that the non-normal set is consistent across more
complex operations than the included tests.
$ hg init
$ touch a
$ unset HGUSER
$ echo "[ui]" >> .hg/hgrc
$ echo "username= foo" >> .hg/hgrc
$ echo " bar1" >> .hg/hgrc
$ hg ci -Am m
adding a
abort: username 'foo\nbar1' contains a newline
[255]
$ rm .hg/hgrc
$ HGUSER=`(echo foo; echo bar2)` hg ci -Am m
abort: username 'foo\nbar2' contains a newline
[255]
$ hg ci -Am m -u "`(echo foo; echo bar3)`"
transaction abort!
rollback completed
abort: username 'foo\nbar3' contains a newline!
[255]