diff --git a/radicale/tests/test_base.py b/radicale/tests/test_base.py
index 938c800..45e9e01 100644
--- a/radicale/tests/test_base.py
+++ b/radicale/tests/test_base.py
@@ -263,8 +263,9 @@ class BaseRequestsMixIn:
         filters_text = "".join(
             "<C:filter>%s</C:filter>" % filter_ for filter_ in filters)
         self.request("MKCOL", "/calendar.ics/")
-        self.request(
+        status, _, _ = self.request(
             "PUT", "/calendar.ics/", "BEGIN:VCALENDAR\r\nEND:VCALENDAR")
+        assert status == 201
         for i in range(items):
             filename = "{}{}.ics".format(kind, i + 1)
             event = get_file_content(filename)