diff --git a/internal/authenticator/key_test.go b/internal/authenticator/key_test.go
index db7cab7..2f75836 100644
--- a/internal/authenticator/key_test.go
+++ b/internal/authenticator/key_test.go
@@ -7,6 +7,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// nolint: funlen
 func TestGenerateKeys(t *testing.T) {
 	t.Parallel()
 
@@ -37,6 +38,15 @@ func TestGenerateKeys(t *testing.T) {
 			haveErr: true,
 			err:     nil,
 		},
+		{
+			name:   "rsa method with invalid key",
+			method: "RSA512",
+			keys: map[string]string{
+				"snpay": "YWRtaW4",
+			},
+			haveErr: true,
+			err:     nil,
+		},
 		{
 			name:    "invalid key type",
 			method:  "Parham",