t7601: extend the 'merge picks up the best result' test

The test only checked if the best result picking code works if there are
multiple strategies set in the config. Add a similar one that tests if
the same true if the -s option of git merge was used multiple times.

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7601-merge-pull-config.sh

@@ -112,6 +112,21 @@ test_expect_success 'setup conflicted merge' '
 # recusive is choosen.
 
 test_expect_success 'merge picks up the best result' '
+	git config --unset-all pull.twohead &&
+	git reset --hard c5 &&
+	git merge -s resolve c6
+	resolve_count=$(conflict_count) &&
+	git reset --hard c5 &&
+	git merge -s recursive c6
+	recursive_count=$(conflict_count) &&
+	git reset --hard c5 &&
+	git merge -s recursive -s resolve c6
+	auto_count=$(conflict_count) &&
+	test $auto_count = $recursive_count &&
+	test $auto_count != $resolve_count
+'
+
+test_expect_success 'merge picks up the best result (from config)' '
 	git config pull.twohead "recursive resolve" &&
 	git reset --hard c5 &&
 	git merge -s resolve c6