ls-tree tests: add tests for --name-status

The --name-status synonym for --name-only added in
c639a5548a (ls-tree: --name-only, 2005-12-01) had no tests, let's
make sure it works the same way as its sibling.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Teng Long <dyroneteng@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3101-ls-tree-dirname.sh

@@ -201,9 +201,11 @@ EOF
 	test_cmp expected check
 '
 
-test_expect_success 'ls-tree --name-only' '
-	git ls-tree --name-only $tree >current &&
-	cat >expected <<\EOF &&
+for opt in --name-only --name-status
+do
+	test_expect_success "ls-tree $opt" '
+		git ls-tree $opt $tree >current &&
+		cat >expected <<-\EOF &&
 		1.txt
 		2.txt
 		path0
@@ -214,9 +216,9 @@ EOF
 		test_output
 	'
 
-test_expect_success 'ls-tree --name-only -r' '
-	git ls-tree --name-only -r $tree >current &&
-	cat >expected <<\EOF &&
+	test_expect_success "ls-tree $opt -r" '
+		git ls-tree $opt -r $tree >current &&
+		cat >expected <<-\EOF &&
 		1.txt
 		2.txt
 		path0/a/b/c/1.txt
@@ -227,5 +229,6 @@ path3/2.txt
 		EOF
 		test_output
 	'
+done
 
 test_done