bug#31644: tests/ls/abmon-align does not work today (May 29th)

[Kamil Dudka]

Re-posting with a fresh subject.  debbugs.gnu.org rejected my original post 
because the original bug has been closed and has received no comments for more 
than 28 days:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30814


On Wednesday, March 14, 2018 7:40:31 PM CEST Pádraig Brady wrote:
> Given the increase in supported size should only impact relatively few
> languages it probably makes sense to increase to 12. The attached does that
> and also augments the test to find ambiguous cases.

The ls/abmon-align test does not work today (May 29th) because of the added 
check.  The problem is that:

    touch '-d+N month' for N={01..12}

... in general does not create 12 files with timestamps in different months. 

If you run it today (May 29th), touch '-d+09 month' results in March 1st while 
touch '-d+10 month' results in March 29th.  Consequently, both 09.ts and 10.ts 
have the same month (March) to begin with and the check for duplicates has to 
fail:

++ echo 'Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Mar
Mar
Apr
May'
++ sort
++ uniq -d
++ wc -l
+ n_dupes=1
+ test 1 = 1
+ test 1 = 0
+ fail=1
+ break 2
+ test 1 = 1
+ echo 'misalignment or ambiguous output in C locale:'
misalignment or ambiguous output in C locale:
+ LC_ALL=C
+ TIME_STYLE=+%b
+ ls -lgG 01.ts 02.ts 03.ts 04.ts 05.ts 06.ts 07.ts 08.ts 09.ts 10.ts 11.ts 
12.ts
-rw-rw-r-- 1 0 Jun 01.ts
-rw-rw-r-- 1 0 Jul 02.ts
-rw-rw-r-- 1 0 Aug 03.ts
-rw-rw-r-- 1 0 Sep 04.ts
-rw-rw-r-- 1 0 Oct 05.ts
-rw-rw-r-- 1 0 Nov 06.ts
-rw-rw-r-- 1 0 Dec 07.ts
-rw-rw-r-- 1 0 Jan 08.ts
-rw-rw-r-- 1 0 Mar 09.ts
-rw-rw-r-- 1 0 Mar 10.ts
-rw-rw-r-- 1 0 Apr 11.ts
-rw-rw-r-- 1 0 May 12.ts