[PATCH] 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 and doesn't silently act as an alias
for the '--set-upstream-to' option due to option parsing features.

To avoid confusion, clarify that the option is an unsupported one
in the corresponding test description.

Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
---
 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..d14de82ba 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 'unsupported option --set-upstream fails' '
     test_must_fail git branch --set-upstream origin/master
 '
 
-- 
2.18.0.rc1.242.g61856ae69