tests/test-bookmarks

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 "bookmarks=" >> $HGRCPATH

hg init

echo % no bookmarks
hg bookmarks

echo % bookmark rev -1
hg bookmark X

echo % list bookmarks
hg bookmarks

echo a > a
hg add a
hg commit -m 0

echo % bookmark X moved to rev 0
hg bookmarks

echo % look up bookmark
hg log -r X

echo % second bookmark for rev 0
hg bookmark X2

echo % bookmark rev -1 again
hg bookmark -r null Y

echo % list bookmarks
hg bookmarks

echo b > b
hg add b
hg commit -m 1

echo % bookmarks X and X2 moved to rev 1, Y at rev -1
hg bookmarks

echo % bookmark rev 0 again
hg bookmark -r 0 Z

echo c > c
hg add c
hg commit -m 2

echo % bookmarks X and X2 moved to rev 2, Y at rev -1, Z at rev 0
hg bookmarks

echo % rename nonexistent bookmark
hg bookmark -m A B

echo % rename to existent bookmark
hg bookmark -m X Y

echo % force rename to existent bookmark
hg bookmark -f -m X Y

echo % list bookmarks
hg bookmark

echo % rename without new name
hg bookmark -m Y

echo % delete without name
hg bookmark -d

echo % delete nonexistent bookmark
hg bookmark -d A

echo % bookmark name with spaces should be stripped
hg bookmark ' x  y '

echo % list bookmarks
hg bookmarks

echo % look up stripped bookmark name
hg log -r 'x  y'

echo % reject bookmark name with newline
hg bookmark '
'

echo % bookmark with existing name
hg bookmark Z

echo % force bookmark with existing name
hg bookmark -f Z

echo % list bookmarks
hg bookmark

echo % revision but no bookmark name
hg bookmark -r .

true