diff --git a/t/t1402-check-ref-format.sh b/t/t1402-check-ref-format.sh
index cabc516ae9a4fa..bc1e878a0fb4a1 100755
--- a/t/t1402-check-ref-format.sh
+++ b/t/t1402-check-ref-format.sh
@@ -51,12 +51,20 @@ invalid_ref '.refs/foo'
 invalid_ref 'refs/heads/foo.'
 invalid_ref 'heads/foo..bar'
 invalid_ref 'heads/foo?bar'
+invalid_ref 'heads/foo~bar'
+invalid_ref 'heads/foo^bar'
+invalid_ref 'heads/foo:bar'
+invalid_ref 'heads/foo*bar'
+invalid_ref 'heads/foo[bar'
+invalid_ref 'heads/foo bar'
 valid_ref 'foo./bar'
 invalid_ref 'heads/foo.lock'
 invalid_ref 'heads///foo.lock'
 invalid_ref 'foo.lock/bar'
 invalid_ref 'foo.lock///bar'
 valid_ref 'heads/foo@bar'
+valid_ref 'refs/@'
+invalid_ref '@' --allow-onelevel
 invalid_ref 'heads/v@{ation'
 invalid_ref 'heads/foo\bar'
 invalid_ref "$(printf 'heads/foo\t')"