[PATCH v2] t3200: clarify description of --set-upstream test

[Kaartic Sivaraam <kaartic.sivaraam@gmail.com>]

Support for the --set-upstream option was removed in 52668846ea
(builtin/branch: stop supporting the "--set-upstream" option,
2017-08-17). The change did not completely remove the command
due to an issue noted in the commit's log message.

So, a test was added to ensure that a command which uses the
'--set-upstream' option fails instead of silently acting as an alias
for the '--set-upstream-to' option due to option parsing features.

To avoid confusion, clarify that the option is disabled intentionally
in the corresponding test description.

The test is expected to be around as long as we intentionally fail
on seeing the '--set-upstream' option which in turn we expect to
do for a period of time after which we can be sure that existing
users of '--set-upstream' are aware that the option is no
longer supported.

Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
---
Changes since v1:

	- update the test description as suggested by Junio

	- updated the commit message to be clear about period upto
	  which we should be testing this.

 t/t3200-branch.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 6c0b7ea4a..e98dbfc1a 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -884,7 +884,7 @@ test_expect_success 'test --unset-upstream on a particular branch' '
 	test_must_fail git config branch.my14.merge
 '
 
-test_expect_success '--set-upstream fails' '
+test_expect_success 'disabled option --set-upstream fails' '
     test_must_fail git branch --set-upstream origin/master
 '
 
-- 
2.18.0.rc1.242.g61856ae69