Fix overwrite of existing cookiejar.

auth_test.go

@@ -63,6 +63,13 @@ func TestLogin(t *testing.T) {
 		}
 		t.Logf("2FA response: %+v\n", lr)
 	}
+
+	session, err := kf.RefreshSession(ctx)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	t.Logf("xf_session: %s\n", session)
 }
 
 func genTest2FACode() (uint32, error) {