Fix non-empty $CDPATH causing failed tests.
If CDPATH contains '.', every cd command prints the target path,
which causes additional output in tests and makes them fail.
updating working directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
pulling from ../test-a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
merging test.txt
warning: conflicts during merge.
merging test.txt failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
pulling from ../test-a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
resolving manifests
overwrite None partial False
ancestor faaea63e63a9 local 451c744aabcc+ remote a070d41e8360
searching for copies back to rev 1
test.txt: versions differ -> m
preserving test.txt for resolve of test.txt
picked tool 'internal:merge' for test.txt (binary False symlink False)
merging test.txt
my test.txt@451c744aabcc+ other test.txt@a070d41e8360 ancestor test.txt@faaea63e63a9
warning: conflicts during merge.
merging test.txt failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
one
<<<<<<< local
two-point-five
=======
two-point-one
>>>>>>> other
three
rev offset length base linkrev nodeid p1 p2
0 0 7 0 0 01365c4cca56 000000000000 000000000000
1 7 9 1 1 7b013192566a 01365c4cca56 000000000000
2 16 15 2 2 8fe46a3eb557 01365c4cca56 000000000000
3 31 27 2 3 fc3148072371 7b013192566a 8fe46a3eb557
4 58 25 4 4 d40249267ae3 8fe46a3eb557 000000000000
changeset: 4:a070d41e8360
tag: tip
parent: 2:faaea63e63a9
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: two -> two-point-one
changeset: 3:451c744aabcc
parent: 1:e409be6afcc0
parent: 2:faaea63e63a9
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Merge 1
changeset: 2:faaea63e63a9
parent: 0:095c92b91f1a
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Numbers as words
changeset: 1:e409be6afcc0
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 2 -> 2.5
changeset: 0:095c92b91f1a
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: Initial