t1401: test reflog creation for git-symbolic-ref

The current code writes a reflog entry whenever we update a
symbolic ref, but we never test that this is so. Let's add a
test to make sure upcoming refactoring doesn't cause a
regression.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1401-symbolic-ref.sh

@@ -69,4 +69,20 @@ test_expect_success 'symbolic-ref reports failure in exit code' '
 	test_must_fail git symbolic-ref HEAD refs/heads/whatever
 '
 
+test_expect_success 'symbolic-ref writes reflog entry' '
+	git checkout -b log1 &&
+	test_commit one &&
+	git checkout -b log2  &&
+	test_commit two &&
+	git checkout --orphan orphan &&
+	git symbolic-ref -m create HEAD refs/heads/log1 &&
+	git symbolic-ref -m update HEAD refs/heads/log2 &&
+	cat >expect <<-\EOF &&
+	update
+	create
+	EOF
+	git log --format=%gs -g >actual &&
+	test_cmp expect actual
+'
+
 test_done