t3301-notes.sh: check that default operation mode doesn't take arguments

'git notes' without a subcommand defaults to listing all notes and
doesn't accept any arguments.

We are about to teach parse-options to handle subcommands, and update
'git notes' to make use of that new feature.  So let's add a test to
make sure that the upcoming changes don't inadvertenly change the
behavior in this corner case.

Signed-off-by: SZEDER Gábor <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: szeder

t/t3301-notes.sh

@@ -505,6 +505,11 @@ test_expect_success 'list notes with "git notes"' '
 	test_cmp expect actual
 '
 
+test_expect_success '"git notes" without subcommand does not take arguments' '
+	test_expect_code 129 git notes HEAD^^ 2>err &&
+	grep "^error: unknown subcommand" err
+'
+
 test_expect_success 'list specific note with "git notes list <object>"' '
 	git rev-parse refs/notes/commits:$commit_3 >expect &&
 	git notes list HEAD^^ >actual &&