Tests for using Ctrl-A/Ctrl-X on visual selections

Test cases
==========

1) Ctrl-A on visually selected number
Text:
foobar-10
    1)    Ctrl-A on start of line:
	foobar-9
    2)    Ctrl-A on visually selected "-10":
	foobar-9
    3)    Ctrl-A on visually selected "10":
	foobar-11
    4)    Ctrl-X on visually selected "-10"
	foobar-11
    5)    Ctrl-X on visually selected "10"
	foobar-9

2) Ctrl-A on visually selected lines
Text:
10
20
30
40

    1) Ctrl-A on visually selected lines:
11
21
31
41

    2) Ctrl-X on visually selected lines:
9
19
29
39

3) g Ctrl-A on visually selected lines, with non-numbers in between
Text:
10

20

30

40

    1) 2 g Ctrl-A on visually selected lines:
12

24

36

48
    2) 2 g Ctrl-X on visually selected lines
8

16

24

32

4) Ctrl-A on non-number
Text:
foobar-10
    1) visually select foobar:
    foobar-10

STARTTEST
:so small.vim

:" Test 1
:/^S1=/+,/^E1=/-y a
:/^E1/+put a

:/^E1/+2put a
f-v$
:/^E1/+3put a
f1v$
:/^E1/+4put a
f-v$:/^E1/+5put a
f1v$

:" Test 22
:/^S2=/+,/^E2=/-y a
:/^E2/+put a
V3k$
:.+put a
V3k$

:" Test 3
:/^S3=/+,/^E3=/-y a
:/^E3=/+put a
V6k2g
:.+put a
V6k2g

:" Test 4
:/^S4=/+,/^E4=/-y a
:/^E4=/+put a
vf-


:" Save the report
:/^# Test 1/,$w! test.out
:qa!


# Test 1
S1======
foobar-10
E1======



# Test 2
S2=====
10
20
30
40
E2=====



# Test 3
S3=====
10

20

30

40
E3=====



# Test 4
S4=====
foobar-10
E4=====


ENDTEST