diff --git a/t/t2013-checkout-submodule.sh b/t/t2013-checkout-submodule.sh
index 06b18f8bc1e2991170736254bf3c558ab4673d13..6847f7582234d656563f867976a64142a3a01621 100755
--- a/t/t2013-checkout-submodule.sh
+++ b/t/t2013-checkout-submodule.sh
@@ -3,6 +3,7 @@
 test_description='checkout can handle submodules'
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-submodule-update.sh
 
 test_expect_success 'setup' '
 	mkdir submodule &&
@@ -62,4 +63,8 @@ test_expect_success '"checkout <submodule>" honors submodule.*.ignore from .git/
 	! test -s actual
 '
 
+test_submodule_switch "git checkout"
+
+test_submodule_forced_switch "git checkout -f"
+
 test_done